Arizona Plants Checklist 2008
 
Data Source: USDA, NRCS. 2008. The PLANTS Database (http://plants.usda.gov, 3 February 2008).
National Plant Data Center, Baton Rouge, LA 70874-4490 USA.
 
Scientific Name Common Name Family
A
Abies fir Pinaceae
Abies concolor white fir Pinaceae
Abies concolor var. concolor white fir Pinaceae
Abies lasiocarpa subalpine fir Pinaceae
Abies lasiocarpa var. arizonica corkbark fir Pinaceae
Abies lasiocarpa var. lasiocarpa subalpine fir Pinaceae
Abronia sand verbena Nyctaginaceae
Abronia angustifolia purple sand verbena Nyctaginaceae
Abronia elliptica fragrant white sand verbena Nyctaginaceae
Abronia fragrans snowball sand verbena Nyctaginaceae
Abronia nana dwarf sand verbena Nyctaginaceae
Abronia nana var. nana dwarf sand verbena Nyctaginaceae
Abronia villosa desert sand verbena Nyctaginaceae
Abronia villosa var. aurita desert sand verbena Nyctaginaceae
Abronia villosa var. villosa desert sand verbena Nyctaginaceae
Abutilon Indian mallow Malvaceae
Abutilon abutiloides shrubby Indian mallow Malvaceae
Abutilon incanum pelotazo Malvaceae
Abutilon malacum yellow Indian mallow Malvaceae
Abutilon mollicomum Sonoran Indian mallow Malvaceae
Abutilon palmeri Palmer's Indian mallow Malvaceae
Abutilon parishii Parish's Indian mallow Malvaceae
Abutilon parvulum dwarf Indian mallow Malvaceae
Abutilon reventum yellowflower Indian mallow Malvaceae
Abutilon theophrasti velvetleaf Malvaceae
Abutilon thurberi Thurber's Indian mallow Malvaceae
Acacia acacia Fabaceae
Acacia angustissima prairie acacia Fabaceae
Acacia angustissima var. shrevei Shreve's prairie acacia Fabaceae
Acacia angustissima var. suffrutescens prairie acacia Fabaceae
Acacia angustissima var. texensis prairie wattle Fabaceae
Acacia constricta whitethorn acacia Fabaceae
Acacia constricta var. constricta whitethorn acacia Fabaceae
Acacia constricta var. paucispina whitethorn acacia Fabaceae
Acacia farnesiana sweet acacia Fabaceae
Acacia greggii catclaw acacia Fabaceae
Acacia greggii var. greggii catclaw acacia Fabaceae
Acacia millefolia milfoil wattle Fabaceae
Acacia neovernicosa viscid acacia Fabaceae
Acacia redolens bank catclaw Fabaceae
Acalypha copperleaf Euphorbiaceae
Acalypha californica California copperleaf Euphorbiaceae
Acalypha mexicana Mexican copperleaf Euphorbiaceae
Acalypha neomexicana New Mexico copperleaf Euphorbiaceae
Acalypha ostryifolia pineland threeseed mercury Euphorbiaceae
Acalypha phleoides shrubby copperleaf Euphorbiaceae
Acamptopappus goldenhead Asteraceae
Acamptopappus sphaerocephalus rayless goldenhead Asteraceae
Acamptopappus sphaerocephalus var. hirtellus rayless goldenhead Asteraceae
Acamptopappus sphaerocephalus var. sphaerocephalus rayless goldenhead Asteraceae
Acer maple Aceraceae
Acer glabrum Rocky Mountain maple Aceraceae
Acer glabrum var. diffusum Rocky Mountain maple Aceraceae
Acer glabrum var. glabrum Rocky Mountain maple Aceraceae
Acer glabrum var. neomexicanum New Mexico maple Aceraceae
Acer grandidentatum bigtooth maple Aceraceae
Acer grandidentatum var. grandidentatum bigtooth maple Aceraceae
Acer grandidentatum var. sinuosum canyon maple Aceraceae
Acer negundo boxelder Aceraceae
Acer negundo var. arizonicum Arizona boxelder Aceraceae
Acer negundo var. interius boxelder Aceraceae
Achillea yarrow Asteraceae
Achillea millefolium common yarrow Asteraceae
Achillea millefolium var. alpicola common yarrow Asteraceae
Achillea millefolium var. occidentalis western yarrow Asteraceae
Achnatherum needlegrass Poaceae
Achnatherum aridum Mormon needlegrass Poaceae
Achnatherum bloomeri Poaceae
Achnatherum eminens southwestern needlegrass Poaceae
Achnatherum hymenoides Indian ricegrass Poaceae
Achnatherum lemmonii Lemmon's needlegrass Poaceae
Achnatherum lemmonii var. lemmonii Lemmon's needlegrass Poaceae
Achnatherum lettermanii Letterman's needlegrass Poaceae
Achnatherum lobatum littleawn needlegrass Poaceae
Achnatherum nelsonii Columbia needlegrass Poaceae
Achnatherum nelsonii ssp. dorei Dore's needlegrass Poaceae
Achnatherum nelsonii ssp. nelsonii Columbia needlegrass Poaceae
Achnatherum occidentale western needlegrass Poaceae
Achnatherum occidentale ssp. pubescens pubescent western needlegrass Poaceae
Achnatherum parishii Parish's needlegrass Poaceae
Achnatherum parishii var. parishii Parish's needlegrass Poaceae
Achnatherum perplexum New Mexico needlegrass Poaceae
Achnatherum pinetorum pine needlegrass Poaceae
Achnatherum robustum sleepygrass Poaceae
Achnatherum speciosum desert needlegrass Poaceae
Achyronychia achyronychia Caryophyllaceae
Achyronychia cooperi onyxflower Caryophyllaceae
Acleisanthes trumpets Nyctaginaceae
Acleisanthes longiflora angel's trumpets Nyctaginaceae
Aconitum monkshood Ranunculaceae
Aconitum columbianum Columbian monkshood Ranunculaceae
Aconitum columbianum ssp. columbianum Columbian monkshood Ranunculaceae
Aconitum infectum Arizona monkshood Ranunculaceae
Acourtia desertpeony Asteraceae
Acourtia nana dwarf desertpeony Asteraceae
Acourtia thurberi Thurber's desertpeony Asteraceae
Acourtia wrightii brownfoot Asteraceae
Acroptilon hardheads Asteraceae
Acroptilon repens hardheads Asteraceae
Actaea baneberry Ranunculaceae
Actaea arizonica Arizona bugbane Ranunculaceae
Actaea rubra red baneberry Ranunculaceae
Actaea rubra ssp. arguta red baneberry Ranunculaceae
Adenophyllum dogweed Asteraceae
Adenophyllum cooperi Cooper's dogweed Asteraceae
Adenophyllum porophylloides San Felipe dogweed Asteraceae
Adenophyllum porophyllum poreleaf dogweed Asteraceae
Adenophyllum wrightii Wright's dogweed Asteraceae
Adiantum maidenhair fern Pteridaceae
Adiantum aleuticum Aleutian maidenhair Pteridaceae
Adiantum capillus-veneris common maidenhair Pteridaceae
Aegilops goatgrass Poaceae
Aegilops cylindrica jointed goatgrass Poaceae
Aegilops tauschii Tausch's goatgrass Poaceae
Aegopogon relaxgrass Poaceae
Aegopogon tenellus fragilegrass Poaceae
Aeluropus Poaceae
Aeluropus littoralis Poaceae
Aeschynomene jointvetch Fabaceae
Aeschynomene villosa hairy jointvetch Fabaceae
Agastache giant hyssop Lamiaceae
Agastache breviflora Trans-Pecos giant hyssop Lamiaceae
Agastache micrantha white giant hyssop Lamiaceae
Agastache pallida pale giant hyssop Lamiaceae
Agastache pallidiflora Bill Williams Mountain giant hyssop Lamiaceae
Agastache pallidiflora ssp. pallidiflora Bill Williams Mountain giant hyssop Lamiaceae
Agastache pallidiflora ssp. pallidiflora var. gilensis Bill Williams Mountain giant hyssop Lamiaceae
Agastache pallidiflora ssp. pallidiflora var. greenei Bill Williams Mountain giant hyssop Lamiaceae
Agastache pallidiflora ssp. pallidiflora var. pallidiflora Bill Williams Mountain giant hyssop Lamiaceae
Agastache rupestris threadleaf giant hyssop Lamiaceae
Agastache wrightii Sonoran giant hyssop Lamiaceae
Agave agave Agavaceae
Agave ajoensis Agavaceae
Agave americana American century plant Agavaceae
Agave americana ssp. americana American century plant Agavaceae
Agave americana ssp. americana var. expansa American century plant Agavaceae
Agave arizonica Arizona century plant Agavaceae
Agave chrysantha goldenflower century plant Agavaceae
Agave delamateri Tonto Basin century plant Agavaceae
Agave deserti desert agave Agavaceae
Agave deserti ssp. simplex desert agave Agavaceae
Agave murpheyi Murphey's century plant Agavaceae
Agave palmeri Palmer's century plant Agavaceae
Agave parryi Parry's agave Agavaceae
Agave parryi ssp. parryi Parry's agave Agavaceae
Agave parviflora smallflower century plant Agavaceae
Agave phillipsiana Grand Canyon century plant Agavaceae
Agave schottii Schott's century plant Agavaceae
Agave schottii var. schottii Schott's century plant Agavaceae
Agave schottii var. treleasei Trelease's century plant Agavaceae
Agave toumeyana Toumey's century plant Agavaceae
Agave toumeyana var. bella Toumey's century plant Agavaceae
Agave toumeyana var. toumeyana Toumey's century plant Agavaceae
Agave univittata McKelvey's century plant Agavaceae
Agave utahensis Utah agave Agavaceae
Agave utahensis var. kaibabensis Kaibab agave Agavaceae
Agave utahensis var. utahensis Utah agave Agavaceae
Ageratina snakeroot Asteraceae
Ageratina herbacea fragrant snakeroot Asteraceae
Ageratina lemmonii Lemmon's snakeroot Asteraceae
Ageratina paupercula Santa Rita snakeroot Asteraceae
Ageratina rothrockii Rothrock's snakeroot Asteraceae
Ageratina wrightii Wright's snakeroot Asteraceae
Ageratum whiteweed Asteraceae
Ageratum corymbosum flat-top whiteweed Asteraceae
Agoseris agoseris Asteraceae
Agoseris aurantiaca orange agoseris Asteraceae
Agoseris aurantiaca var. purpurea orange agoseris Asteraceae
Agoseris glauca pale agoseris Asteraceae
Agoseris glauca var. dasycephala pale agoseris Asteraceae
Agoseris glauca var. glauca pale agoseris Asteraceae
Agoseris glauca var. laciniata false agoseris Asteraceae
Agoseris heterophylla annual agoseris Asteraceae
Agoseris heterophylla var. heterophylla annual agoseris Asteraceae
Agrimonia agrimony Rosaceae
Agrimonia gryposepala tall hairy agrimony Rosaceae
Agrimonia striata roadside agrimony Rosaceae
Agropyron wheatgrass Poaceae
Agropyron desertorum desert wheatgrass Poaceae
Agrostis bentgrass Poaceae
Agrostis elliottiana Elliott's bentgrass Poaceae
Agrostis exarata spike bentgrass Poaceae
Agrostis gigantea redtop Poaceae
Agrostis idahoensis Idaho bentgrass Poaceae
Agrostis scabra rough bentgrass Poaceae
Agrostis stolonifera creeping bentgrass Poaceae
Ailanthus ailanthus Simaroubaceae
Ailanthus altissima tree of heaven Simaroubaceae
Albizia albizia Fabaceae
Albizia julibrissin silktree Fabaceae
Aletes Indian parsley Apiaceae
Aletes macdougalii MacDougal's Indian parsley Apiaceae
Aletes macdougalii ssp. macdougalii MacDougal's Indian parsley Apiaceae
Aletes sessiliflorus sessileflower Indian parsley Apiaceae
Alhagi alhagi Fabaceae
Alhagi maurorum camelthorn Fabaceae
Aliciella Polemoniaceae
Aliciella hutchinsifolia desert pale gilia Polemoniaceae
Aliciella latifolia broad-leaf gilia Polemoniaceae
Aliciella latifolia ssp. latifolia broadleaf gilia Polemoniaceae
Aliciella leptomeria sand gilia Polemoniaceae
Aliciella lottiae Lott's gilia Polemoniaceae
Aliciella subacaulis pinyon gilia Polemoniaceae
Aliciella subnuda coral gilia Polemoniaceae
Aliciella triodon coyote gilia Polemoniaceae
Alisma water plantain Alismataceae
Alisma gramineum narrowleaf water plantain Alismataceae
Alisma subcordatum American water plantain Alismataceae
Alisma triviale northern water plantain Alismataceae
Allenrolfea allenrolfea Chenopodiaceae
Allenrolfea occidentalis iodinebush Chenopodiaceae
Allionia windmills Nyctaginaceae
Allionia choisyi annual windmills Nyctaginaceae
Allionia incarnata trailing windmills Nyctaginaceae
Allionia incarnata var. incarnata trailing windmills Nyctaginaceae
Allionia incarnata var. nudata trailing windmills Nyctaginaceae
Allionia incarnata var. villosa trailing windmills Nyctaginaceae
Allium onion Liliaceae
Allium acuminatum tapertip onion Liliaceae
Allium atrorubens darkred onion Liliaceae
Allium atrorubens var. atrorubens darkred onion Liliaceae
Allium atrorubens var. cristatum darkred onion Liliaceae
Allium bigelovii Bigelow's onion Liliaceae
Allium bisceptrum twincrest onion Liliaceae
Allium bisceptrum var. palmeri aspen onion Liliaceae
Allium cernuum nodding onion Liliaceae
Allium cernuum var. neomexicanum New Mexican nodding onion Liliaceae
Allium cernuum var. obtusum nodding onion Liliaceae
Allium geyeri Geyer's onion Liliaceae
Allium geyeri var. geyeri Geyer's onion Liliaceae
Allium geyeri var. tenerum bulbil onion Liliaceae
Allium glandulosum gland onion Liliaceae
Allium gooddingii Goodding's onion Liliaceae
Allium kunthii Kunth's onion Liliaceae
Allium macropetalum largeflower onion Liliaceae
Allium nevadense Nevada onion Liliaceae
Allium parishii Parish's onion Liliaceae
Allium plummerae Tanners Canyon onion Liliaceae
Allophyllum false gilyflower Polemoniaceae
Allophyllum gilioides dense false gilyflower Polemoniaceae
Allophyllum gilioides ssp. gilioides dense false gilyflower Polemoniaceae
Almutaster alkali marsh aster Asteraceae
Almutaster pauciflorus alkali marsh aster Asteraceae
Alnus alder Betulaceae
Alnus incana gray alder Betulaceae
Alnus incana ssp. tenuifolia thinleaf alder Betulaceae
Alnus oblongifolia Arizona alder Betulaceae
Alopecurus foxtail Poaceae
Alopecurus aequalis shortawn foxtail Poaceae
Alopecurus aequalis var. aequalis shortawn foxtail Poaceae
Alopecurus arundinaceus creeping meadow foxtail Poaceae
Alopecurus carolinianus Carolina foxtail Poaceae
Alopecurus geniculatus water foxtail Poaceae
Alopecurus geniculatus var. geniculatus water foxtail Poaceae
Aloysia beebrush Verbenaceae
Aloysia gratissima whitebrush Verbenaceae
Aloysia gratissima var. schulziae whitebrush Verbenaceae
Aloysia wrightii Wright's beebrush Verbenaceae
Alternanthera joyweed Amaranthaceae
Alternanthera caracasana washerwoman Amaranthaceae
Amaranthus pigweed Amaranthaceae
Amaranthus acanthochiton greenstripe Amaranthaceae
Amaranthus albus prostrate pigweed Amaranthaceae
Amaranthus blitoides mat amaranth Amaranthaceae
Amaranthus caudatus love-lies-bleeding Amaranthaceae
Amaranthus crassipes spreading amaranth Amaranthaceae
Amaranthus crassipes var. crassipes spreading amaranth Amaranthaceae
Amaranthus cruentus red amaranth Amaranthaceae
Amaranthus fimbriatus fringed amaranth Amaranthaceae
Amaranthus hybridus slim amaranth Amaranthaceae
Amaranthus hypochondriacus Prince-of-Wales feather Amaranthaceae
Amaranthus obcordatus Trans-Pecos amaranth Amaranthaceae
Amaranthus palmeri carelessweed Amaranthaceae
Amaranthus powellii Powell's amaranth Amaranthaceae
Amaranthus powellii ssp. powellii Powell's amaranth Amaranthaceae
Amaranthus pringlei Pringle's amaranth Amaranthaceae
Amaranthus retroflexus redroot amaranth Amaranthaceae
Amaranthus torreyi Torrey's amaranthus Amaranthaceae
Amaranthus tucsonensis Amaranthaceae
Amaranthus venulosus fringed amaranth Amaranthaceae
Amaranthus viridis slender amaranth Amaranthaceae
Amaranthus watsonii Watson's amaranth Amaranthaceae
Amaranthus wrightii Wright's amaranth Amaranthaceae
Ambrosia ragweed Asteraceae
Ambrosia acanthicarpa flatspine bur ragweed Asteraceae
Ambrosia ambrosioides ambrosia leaf bur ragweed Asteraceae
Ambrosia artemisiifolia annual ragweed Asteraceae
Ambrosia artemisiifolia var. elatior annual ragweed Asteraceae
Ambrosia canescens hairy ragweed Asteraceae
Ambrosia confertiflora weakleaf bur ragweed Asteraceae
Ambrosia cordifolia Tucson bur ragweed Asteraceae
Ambrosia deltoidea triangle bur ragweed Asteraceae
Ambrosia dumosa burrobush Asteraceae
Ambrosia eriocentra woolly fruit bur ragweed Asteraceae
Ambrosia ilicifolia hollyleaf bur ragweed Asteraceae
Ambrosia psilostachya Cuman ragweed Asteraceae
Ambrosia tomentosa skeletonleaf bur ragweed Asteraceae
Ambrosia trifida great ragweed Asteraceae
Ambrosia trifida var. texana Texan great ragweed Asteraceae
Ambrosia trifida var. trifida great ragweed Asteraceae
Amelanchier serviceberry Rosaceae
Amelanchier pumila dwarf serviceberry Rosaceae
Amelanchier utahensis Utah serviceberry Rosaceae
Amelanchier utahensis var. covillei Coville's serviceberry Rosaceae
Amelanchier utahensis var. utahensis Utah serviceberry Rosaceae
Ammannia redstem Lythraceae
Ammannia auriculata eared redstem Lythraceae
Ammannia coccinea valley redstem Lythraceae
Ammannia robusta grand redstem Lythraceae
Ammi ammi Apiaceae
Ammi majus large bullwort Apiaceae
Ammocodon ammocodon Nyctaginaceae
Ammocodon chenopodioides goosefoot moonpod Nyctaginaceae
Ammoselinum sandparsley Apiaceae
Ammoselinum giganteum western sandparsley Apiaceae
Amoreuxia yellowshow Bixaceae
Amoreuxia gonzalezii Santa Rita mountain yellowshow Bixaceae
Amoreuxia palmatifida Mexican yellowshow Bixaceae
Amorpha false indigo Fabaceae
Amorpha californica California false indigo Fabaceae
Amorpha californica var. californica California false indigo Fabaceae
Amorpha fruticosa desert false indigo Fabaceae
Amphipappus chaffbush Asteraceae
Amphipappus fremontii Fremont's chaffbush Asteraceae
Amphipappus fremontii ssp. spinosus Fremont's chaffbush Asteraceae
Amsinckia fiddleneck Boraginaceae
Amsinckia menziesii Menzies' fiddleneck Boraginaceae
Amsinckia menziesii var. intermedia common fiddleneck Boraginaceae
Amsinckia tessellata bristly fiddleneck Boraginaceae
Amsinckia tessellata var. tessellata bristly fiddleneck Boraginaceae
Amsonia bluestar Apocynaceae
Amsonia grandiflora Arizona bluestar Apocynaceae
Amsonia jonesii Jones' bluestar Apocynaceae
Amsonia kearneyana Kearney's bluestar Apocynaceae
Amsonia longiflora tubular bluestar Apocynaceae
Amsonia longiflora var. longiflora tubular bluestar Apocynaceae
Amsonia palmeri Palmer's bluestar Apocynaceae
Amsonia peeblesii Peebles' bluestar Apocynaceae
Amsonia tomentosa woolly bluestar Apocynaceae
Amsonia tomentosa var. stenophylla woolly bluestar Apocynaceae
Amsonia tomentosa var. tomentosa woolly bluestar Apocynaceae
Anagallis pimpernel Primulaceae
Anagallis arvensis scarlet pimpernel Primulaceae
Anagallis arvensis ssp. arvensis scarlet pimpernel Primulaceae
Anagallis minima chaffweed Primulaceae
Anaphalis pearly everlasting Asteraceae
Anaphalis margaritacea western pearly everlasting Asteraceae
Andropogon bluestem Poaceae
Andropogon gerardii big bluestem Poaceae
Andropogon glomeratus bushy bluestem Poaceae
Andropogon glomeratus var. pumilus bushy bluestem Poaceae
Andropogon hallii sand bluestem Poaceae
Androsace rockjasmine Primulaceae
Androsace occidentalis western rockjasmine Primulaceae
Androsace septentrionalis pygmyflower rockjasmine Primulaceae
Androsace septentrionalis ssp. glandulosa pygmyflower rockjasmine Primulaceae
Androsace septentrionalis ssp. puberulenta pygmyflower rockjasmine Primulaceae
Androsace septentrionalis ssp. subulifera pygmyflower rockjasmine Primulaceae
Androstephium funnel lily Liliaceae
Androstephium breviflorum pink funnel lily Liliaceae
Anemone anemone Ranunculaceae
Anemone cylindrica candle anemone Ranunculaceae
Anemone multifida Pacific anemone Ranunculaceae
Anemone multifida var. multifida Pacific anemone Ranunculaceae
Anemone multifida var. stylosa Pacific anemone Ranunculaceae
Anemone tuberosa tuber anemone Ranunculaceae
Anemone tuberosa var. tuberosa tuber anemone Ranunculaceae
Anemopsis yerba mansa Saururaceae
Anemopsis californica yerba mansa Saururaceae
Anethum dill Apiaceae
Anethum graveolens dill Apiaceae
Angelica angelica Apiaceae
Angelica pinnata small-leaf angelica Apiaceae
Anisacanthus desert honeysuckle Acanthaceae
Anisacanthus thurberi Thurber's desert honeysuckle Acanthaceae
Anisocoma anisocoma Asteraceae
Anisocoma acaulis scalebud Asteraceae
Anoda anoda Malvaceae
Anoda abutiloides Indian anoda Malvaceae
Anoda crenatiflora thicket anoda Malvaceae
Anoda cristata crested anoda Malvaceae
Anoda lanceolata lanceleaf anoda Malvaceae
Anoda pentaschista field anoda Malvaceae
Anoda reticulata netted anoda Malvaceae
Anoda thurberi Arizona anoda Malvaceae
Antennaria pussytoes Asteraceae
Antennaria marginata whitemargin pussytoes Asteraceae
Antennaria media Rocky Mountain pussytoes Asteraceae
Antennaria microphylla littleleaf pussytoes Asteraceae
Antennaria parvifolia small-leaf pussytoes Asteraceae
Antennaria rosea rosy pussytoes Asteraceae
Antennaria rosea ssp. arida rosy pussytoes Asteraceae
Antennaria rosea ssp. confinis rosy pussytoes Asteraceae
Antennaria rosea ssp. pulvinata pulvinate pussytoes Asteraceae
Antennaria rosulata Kaibab pussytoes Asteraceae
Anthemis chamomile Asteraceae
Anthemis cotula stinking chamomile Asteraceae
Antheropeas easterbonnets Asteraceae
Antheropeas lanosum white easterbonnets Asteraceae
Antheropeas wallacei woolly easterbonnets Asteraceae
Anthriscus chervil Apiaceae
Anthriscus caucalis bur chervil Apiaceae
Anulocaulis ringstem Nyctaginaceae
Anulocaulis leiosolenus southwestern ringstem Nyctaginaceae
Anulocaulis leiosolenus var. leiosolenus southwestern ringstem Nyctaginaceae
Apacheria apacheria Crossosomataceae
Apacheria chiricahuensis apachebush Crossosomataceae
Apera silkybent Poaceae
Apera interrupta dense silkybent Poaceae
Aphanostephus dozedaisy Asteraceae
Aphanostephus ramosissimus plains dozedaisy Asteraceae
Aphanostephus ramosissimus var. humilis plains dozedaisy Asteraceae
Apiastrum apiastrum Apiaceae
Apiastrum angustifolium mock parsley Apiaceae
Apium celery Apiaceae
Apium graveolens wild celery Apiaceae
Apium graveolens var. dulce wild celery Apiaceae
Aplectrum Adam and Eve Orchidaceae
Aplectrum hyemale Adam and Eve Orchidaceae
Apocynum dogbane Apocynaceae
Apocynum androsaemifolium spreading dogbane Apocynaceae
Apocynum cannabinum Indianhemp Apocynaceae
Apocynum floribundum Apocynaceae
Apodanthera apodanthera Cucurbitaceae
Apodanthera undulata melon loco Cucurbitaceae
Aquilegia columbine Ranunculaceae
Aquilegia chrysantha golden columbine Ranunculaceae
Aquilegia chrysantha var. chrysantha golden columbine Ranunculaceae
Aquilegia chrysantha var. rydbergii Rydberg's golden columbine Ranunculaceae
Aquilegia coerulea Colorado blue columbine Ranunculaceae
Aquilegia coerulea var. pinetorum Colorado blue columbine Ranunculaceae
Aquilegia desertorum desert columbine Ranunculaceae
Aquilegia elegantula western red columbine Ranunculaceae
Aquilegia longissima longspur columbine Ranunculaceae
Aquilegia micrantha Mancos columbine Ranunculaceae
Aquilegia micrantha var. micrantha Mancos columbine Ranunculaceae
Aquilegia triternata Chiricahua Mountain columbine Ranunculaceae
Arabis rockcress Brassicaceae
Arabis drummondii Drummond's rockcress Brassicaceae
Arabis fendleri Fendler's rockcress Brassicaceae
Arabis fendleri var. fendleri Fendler's rockcress Brassicaceae
Arabis glabra tower rockcress Brassicaceae
Arabis gracilipes Flagstaff rockcress Brassicaceae
Arabis hirsuta hairy rockcress Brassicaceae
Arabis hirsuta var. pycnocarpa creamflower rockcress Brassicaceae
Arabis holboellii Holboell's rockcress Brassicaceae
Arabis holboellii var. pinetorum Holboell's rockcress Brassicaceae
Arabis lignifera desert rockcress Brassicaceae
Arabis pendulina rabbit ear rockcress Brassicaceae
Arabis pendulina var. pendulina rabbit ear rockcress Brassicaceae
Arabis perennans perennial rockcress Brassicaceae
Arabis pulchra beautiful rockcress Brassicaceae
Arabis pulchra var. gracilis beautiful rockcress Brassicaceae
Arabis pulchra var. pallens beautiful rockcress Brassicaceae
Arabis sparsiflora sicklepod rockcress Brassicaceae
Arabis sparsiflora var. sparsiflora sicklepod rockcress Brassicaceae
Arabis tricornuta Rincon Mountain rockcress Brassicaceae
Aralia spikenard Araliaceae
Aralia humilis Arizona spikenard Araliaceae
Aralia racemosa American spikenard Araliaceae
Aralia racemosa ssp. bicrenata American spikenard Araliaceae
Arbutus madrone Ericaceae
Arbutus arizonica Arizona madrone Ericaceae
Arceuthobium dwarf mistletoe Viscaceae
Arceuthobium abietinum fir dwarf mistletoe Viscaceae
Arceuthobium apachecum Apache dwarf mistletoe Viscaceae
Arceuthobium blumeri southwestern white pine dwarf mistletoe Viscaceae
Arceuthobium divaricatum pinyon dwarf mistletoe Viscaceae
Arceuthobium douglasii Douglas-fir dwarf mistletoe Viscaceae
Arceuthobium gillii Huachuca Mountain dwarf mistletoe Viscaceae
Arceuthobium microcarpum western spruce dwarf mistletoe Viscaceae
Arceuthobium vaginatum pineland dwarf mistletoe Viscaceae
Arceuthobium vaginatum ssp. cryptopodum pineland dwarf mistletoe Viscaceae
Arctium burdock Asteraceae
Arctium minus lesser burdock Asteraceae
Arctomecon bearpoppy Papaveraceae
Arctomecon californica California bearpoppy Papaveraceae
Arctostaphylos manzanita Ericaceae
Arctostaphylos patula greenleaf manzanita Ericaceae
Arctostaphylos pringlei Pringle manzanita Ericaceae
Arctostaphylos pringlei ssp. pringlei Pringle manzanita Ericaceae
Arctostaphylos pungens pointleaf manzanita Ericaceae
Arctostaphylos uva-ursi kinnikinnick Ericaceae
Arenaria sandwort Caryophyllaceae
Arenaria aberrans Mt. Dellenbaugh sandwort Caryophyllaceae
Arenaria aculeata prickly sandwort Caryophyllaceae
Arenaria congesta ballhead sandwort Caryophyllaceae
Arenaria congesta var. subcongesta loosehead sandwort Caryophyllaceae
Arenaria eastwoodiae Eastwood's sandwort Caryophyllaceae
Arenaria eastwoodiae var. adenophora Eastwood's sandwort Caryophyllaceae
Arenaria eastwoodiae var. eastwoodiae Eastwood's sandwort Caryophyllaceae
Arenaria fendleri Fendler's sandwort Caryophyllaceae
Arenaria fendleri var. brevifolia Fendler's sandwort Caryophyllaceae
Arenaria fendleri var. fendleri Fendler's sandwort Caryophyllaceae
Arenaria fendleri var. porteri Porter's sandwort Caryophyllaceae
Arenaria fendleri var. tweedyi Tweedy's sandwort Caryophyllaceae
Arenaria lanuginosa spreading sandwort Caryophyllaceae
Arenaria lanuginosa ssp. saxosa spreading sandwort Caryophyllaceae
Arenaria macradenia Mojave sandwort Caryophyllaceae
Arenaria macradenia ssp. ferrisiae Ferris' sandwort Caryophyllaceae
Arenaria macradenia ssp. macradenia Mojave sandwort Caryophyllaceae
Arenaria macradenia ssp. macradenia var. macradenia Mojave sandwort Caryophyllaceae
Argemone pricklypoppy Papaveraceae
Argemone arizonica Arizona pricklypoppy Papaveraceae
Argemone corymbosa Mojave pricklypoppy Papaveraceae
Argemone corymbosa ssp. arenicola Mojave pricklypoppy Papaveraceae
Argemone corymbosa ssp. corymbosa Mojave pricklypoppy Papaveraceae
Argemone gracilenta Sonoran pricklypoppy Papaveraceae
Argemone munita flatbud pricklypoppy Papaveraceae
Argemone munita ssp. argentea flatbud pricklypoppy Papaveraceae
Argemone munita ssp. rotundata flatbud pricklypoppy Papaveraceae
Argemone ochroleuca pale Mexican pricklypoppy Papaveraceae
Argemone pleiacantha southwestern pricklypoppy Papaveraceae
Argemone pleiacantha ssp. ambigua southwestern pricklypoppy Papaveraceae
Argemone pleiacantha ssp. pleiacantha southwestern pricklypoppy Papaveraceae
Argentina silverweed Rosaceae
Argentina anserina silverweed cinquefoil Rosaceae
Argyrochosma false cloak fern Pteridaceae
Argyrochosma incana hairy false cloak fern Pteridaceae
Argyrochosma jonesii Jones' false cloak fern Pteridaceae
Argyrochosma limitanea southwestern false cloak fern Pteridaceae
Argyrochosma limitanea ssp. limitanea southwestern false cloak fern Pteridaceae
Argyrochosma limitanea ssp. mexicana southwestern false cloak fern Pteridaceae
Argythamnia silverbush Euphorbiaceae
Argythamnia adenophora glandular silverbush Euphorbiaceae
Argythamnia brandegeei Sonoran silverbush Euphorbiaceae
Argythamnia brandegeei var. intonsa Sonoran silverbush Euphorbiaceae
Argythamnia claryana desert silverbush Euphorbiaceae
Argythamnia cyanophylla Charleston Mountain silverbush Euphorbiaceae
Argythamnia lanceolata narrowleaf silverbush Euphorbiaceae
Argythamnia mercurialina tall silverbush Euphorbiaceae
Argythamnia mercurialina var. mercurialina tall silverbush Euphorbiaceae
Argythamnia neomexicana New Mexico silverbush Euphorbiaceae
Argythamnia serrata Yuma silverbush Euphorbiaceae
Aristida threeawn Poaceae
Aristida adscensionis sixweeks threeawn Poaceae
Aristida arizonica Arizona threeawn Poaceae
Aristida californica California threeawn Poaceae
Aristida californica var. californica California threeawn Poaceae
Aristida californica var. glabrata Santa Rita threeawn Poaceae
Aristida divaricata poverty threeawn Poaceae
Aristida havardii Havard's threeawn Poaceae
Aristida longespica slimspike threeawn Poaceae
Aristida longespica var. longespica slimspike threeawn Poaceae
Aristida oligantha prairie threeawn Poaceae
Aristida pansa Wooton's threeawn Poaceae
Aristida purpurea purple threeawn Poaceae
Aristida purpurea var. fendleriana Fendler's threeawn Poaceae
Aristida purpurea var. longiseta Fendler threeawn Poaceae
Aristida purpurea var. nealleyi blue threeawn Poaceae
Aristida purpurea var. parishii Parish's threeawn Poaceae
Aristida purpurea var. perplexa purple threeawn Poaceae
Aristida purpurea var. purpurea purple threeawn Poaceae
Aristida purpurea var. wrightii Wright's threeawn Poaceae
Aristida schiedeana single threeawn Poaceae
Aristida schiedeana var. orcuttiana Orcutt's threeawn Poaceae
Aristida ternipes spidergrass Poaceae
Aristida ternipes var. gentilis spidergrass Poaceae
Aristida ternipes var. ternipes spidergrass Poaceae
Aristolochia dutchman's pipe Aristolochiaceae
Aristolochia watsonii Watson's dutchman's pipe Aristolochiaceae
Arnica arnica Asteraceae
Arnica chamissonis Chamisso arnica Asteraceae
Arnica chamissonis ssp. foliosa Chamisso arnica Asteraceae
Arnica chamissonis ssp. foliosa var. andina Chamisso arnica Asteraceae
Arnica cordifolia heartleaf arnica Asteraceae
Arrhenatherum oatgrass Poaceae
Arrhenatherum elatius tall oatgrass Poaceae
Arrhenatherum elatius var. elatius tall oatgrass Poaceae
Artemisia sagebrush Asteraceae
Artemisia annua sweet sagewort Asteraceae
Artemisia biennis biennial wormwood Asteraceae
Artemisia biennis var. biennis biennial wormwood Asteraceae
Artemisia bigelovii Bigelow sage Asteraceae
Artemisia campestris field sagewort Asteraceae
Artemisia campestris ssp. borealis field sagewort Asteraceae
Artemisia campestris ssp. borealis var. scouleriana field sagewort Asteraceae
Artemisia campestris ssp. caudata field sagewort Asteraceae
Artemisia cana silver sagebrush Asteraceae
Artemisia cana ssp. viscidula silver sagebrush Asteraceae
Artemisia carruthii Carruth's sagewort Asteraceae
Artemisia dracunculus tarragon Asteraceae
Artemisia filifolia sand sagebrush Asteraceae
Artemisia franserioides ragweed sagebrush Asteraceae
Artemisia frigida prairie sagewort Asteraceae
Artemisia lindleyana Columbia River wormwood Asteraceae
Artemisia ludoviciana white sagebrush Asteraceae
Artemisia ludoviciana ssp. albula white sagebrush Asteraceae
Artemisia ludoviciana ssp. ludoviciana white sagebrush Asteraceae
Artemisia ludoviciana ssp. mexicana white sagebrush Asteraceae
Artemisia ludoviciana ssp. redolens white sagebrush Asteraceae
Artemisia ludoviciana ssp. sulcata white sagebrush Asteraceae
Artemisia nova black sagebrush Asteraceae
Artemisia pygmaea pygmy sagebrush Asteraceae
Artemisia tridentata big sagebrush Asteraceae
Artemisia tridentata ssp. tridentata basin big sagebrush Asteraceae
Artemisia tridentata ssp. wyomingensis Wyoming big sagebrush Asteraceae
Arundo giant reed Poaceae
Arundo donax giant reed Poaceae
Asanthus brickellbush Asteraceae
Asanthus squamulosus Mule Mountain brickellbush Asteraceae
Asclepias milkweed Asclepiadaceae
Asclepias albicans whitestem milkweed Asclepiadaceae
Asclepias angustifolia Arizona milkweed Asclepiadaceae
Asclepias asperula spider milkweed Asclepiadaceae
Asclepias asperula ssp. asperula spider milkweed Asclepiadaceae
Asclepias asperula ssp. capricornu antelopehorns Asclepiadaceae
Asclepias brachystephana bract milkweed Asclepiadaceae
Asclepias cryptoceras pallid milkweed Asclepiadaceae
Asclepias cryptoceras ssp. cryptoceras pallid milkweed Asclepiadaceae
Asclepias cutleri Cutler's milkweed Asclepiadaceae
Asclepias engelmanniana Engelmann's milkweed Asclepiadaceae
Asclepias erosa desert milkweed Asclepiadaceae
Asclepias glaucescens nodding milkweed Asclepiadaceae
Asclepias hallii Hall's milkweed Asclepiadaceae
Asclepias hypoleuca mahogany milkweed Asclepiadaceae
Asclepias involucrata dwarf milkweed Asclepiadaceae
Asclepias latifolia broadleaf milkweed Asclepiadaceae
Asclepias lemmonii Lemmon's milkweed Asclepiadaceae
Asclepias linaria pineneedle milkweed Asclepiadaceae
Asclepias macrotis longhood milkweed Asclepiadaceae
Asclepias nummularia tufted milkweed Asclepiadaceae
Asclepias nyctaginifolia Mojave milkweed Asclepiadaceae
Asclepias quinquedentata slimpod milkweed Asclepiadaceae
Asclepias rusbyi Rusby's milkweed Asclepiadaceae
Asclepias speciosa showy milkweed Asclepiadaceae
Asclepias subulata rush milkweed Asclepiadaceae
Asclepias subverticillata horsetail milkweed Asclepiadaceae
Asclepias tuberosa butterfly milkweed Asclepiadaceae
Asclepias tuberosa ssp. interior butterfly milkweed Asclepiadaceae
Asclepias uncialis wheel milkweed Asclepiadaceae
Asclepias uncialis ssp. ruthiae Ruth's milkweed Asclepiadaceae
Asclepias uncialis ssp. uncialis wheel milkweed Asclepiadaceae
Asclepias verticillata whorled milkweed Asclepiadaceae
Asclepias viridiflora green comet milkweed Asclepiadaceae
Asclepias welshii Welsh's milkweed Asclepiadaceae
Asparagus asparagus Liliaceae
Asparagus officinalis garden asparagus Liliaceae
Aspicarpa asphead Malpighiaceae
Aspicarpa hirtella chaparral asphead Malpighiaceae
Asplenium spleenwort Aspleniaceae
Asplenium adiantum-nigrum black spleenwort Aspleniaceae
Asplenium dalhousiae Countess Dalhousie's spleenwort Aspleniaceae
Asplenium exiguum little spleenwort Aspleniaceae
Asplenium monanthes singlesorus spleenwort Aspleniaceae
Asplenium palmeri Palmer's spleenwort Aspleniaceae
Asplenium platyneuron ebony spleenwort Aspleniaceae
Asplenium platyneuron var. platyneuron ebony spleenwort Aspleniaceae
Asplenium resiliens blackstem spleenwort Aspleniaceae
Asplenium septentrionale forked spleenwort Aspleniaceae
Asplenium trichomanes maidenhair spleenwort Aspleniaceae
Asplenium trichomanes ssp. trichomanes maidenhair spleenwort Aspleniaceae
Astragalus milkvetch Fabaceae
Astragalus acutirostris sharpkeel milkvetch Fabaceae
Astragalus albulus cibola milkvetch Fabaceae
Astragalus allochrous halfmoon milkvetch Fabaceae
Astragalus allochrous var. allochrous halfmoon milkvetch Fabaceae
Astragalus allochrous var. playanus halfmoon milkvetch Fabaceae
Astragalus amphioxys Crescent milkvetch Fabaceae
Astragalus amphioxys var. amphioxys Crescent milkvetch Fabaceae
Astragalus amphioxys var. modestus Crescent milkvetch Fabaceae
Astragalus amphioxys var. musimonum Crescent milkvetch Fabaceae
Astragalus amphioxys var. vespertinus Aladdin's slippers Fabaceae
Astragalus ampullarius gumbo milkvetch Fabaceae
Astragalus argophyllus silverleaf milkvetch Fabaceae
Astragalus argophyllus var. martinii silverleaf milkvetch Fabaceae
Astragalus argophyllus var. panguicensis silverleaf milkvetch Fabaceae
Astragalus argophyllus var. stocksii silverleaf milkvetch Fabaceae
Astragalus aridus annual desert milkvetch Fabaceae
Astragalus arizonicus Arizona milkvetch Fabaceae
Astragalus beathii Beath's milkvetch Fabaceae
Astragalus bisulcatus twogrooved milkvetch Fabaceae
Astragalus bisulcatus var. bisulcatus twogrooved milkvetch Fabaceae
Astragalus bisulcatus var. haydenianus Hayden's milkvetch Fabaceae
Astragalus bisulcatus var. major twogrooved milkvetch Fabaceae
Astragalus brandegeei Brandegee's milkvetch Fabaceae
Astragalus calycosus Torrey's milkvetch Fabaceae
Astragalus calycosus var. calycosus Torrey's milkvetch Fabaceae
Astragalus calycosus var. scaposus Torrey's milkvetch Fabaceae
Astragalus castaneiformis chestnut milkvetch Fabaceae
Astragalus ceramicus painted milkvetch Fabaceae
Astragalus ceramicus var. ceramicus painted milkvetch Fabaceae
Astragalus chuskanus San Juan milkvetch Fabaceae
Astragalus cobrensis copper mine milkvetch Fabaceae
Astragalus cobrensis var. cobrensis copper mine milkvetch Fabaceae
Astragalus cobrensis var. maguirei Maguire's milkvetch Fabaceae
Astragalus coccineus scarlet milkvetch Fabaceae
Astragalus coltonii Colton's milkvetch Fabaceae
Astragalus coltonii var. moabensis Moab milkvetch Fabaceae
Astragalus crassicarpus groundplum milkvetch Fabaceae
Astragalus crassicarpus var. cavus groundplum milkvetch Fabaceae
Astragalus cremnophylax sentry milkvetch Fabaceae
Astragalus cremnophylax var. cremnophylax sentry milkvetch Fabaceae
Astragalus cremnophylax var. hevronii sentry milkvetch Fabaceae
Astragalus cremnophylax var. myriorrhaphis sentry milkvetch Fabaceae
Astragalus crotalariae Salton milkvetch Fabaceae
Astragalus desperatus rimrock milkvetch Fabaceae
Astragalus desperatus var. conspectus rimrock milkvetch Fabaceae
Astragalus desperatus var. desperatus rimrock milkvetch Fabaceae
Astragalus didymocarpus dwarf white milkvetch Fabaceae
Astragalus didymocarpus var. dispermus dwarf white milkvetch Fabaceae
Astragalus egglestonii Eggleston's milkvetch Fabaceae
Astragalus emoryanus Emory's milkvetch Fabaceae
Astragalus emoryanus var. emoryanus Emory's milkvetch Fabaceae
Astragalus endopterus sandbar milkvetch Fabaceae
Astragalus ensiformis pagumpa milkvetch Fabaceae
Astragalus ensiformis var. ensiformis pagumpa milkvetch Fabaceae
Astragalus episcopus bishop's milkvetch Fabaceae
Astragalus episcopus var. episcopus bishop's milkvetch Fabaceae
Astragalus episcopus var. lancearius bishop's milkvetch Fabaceae
Astragalus eremiticus hermit milkvetch Fabaceae
Astragalus eurylobus Needle Mountain milkvetch Fabaceae
Astragalus flavus yellow milkvetch Fabaceae
Astragalus flexuosus flexile milkvetch Fabaceae
Astragalus flexuosus var. diehlii Diehl's milkvetch Fabaceae
Astragalus flexuosus var. greenei Greene's milkvetch Fabaceae
Astragalus fucatus Hopi milkvetch Fabaceae
Astragalus geyeri Geyer's milkvetch Fabaceae
Astragalus geyeri var. triquetrus Geyer's milkvetch Fabaceae
Astragalus gilensis Gila milkvetch Fabaceae
Astragalus hallii Hall's milkvetch Fabaceae
Astragalus hallii var. fallax Hall's milkvetch Fabaceae
Astragalus hartwegii Hartweg's milkvetch Fabaceae
Astragalus holmgreniorum Paradox milkvetch Fabaceae
Astragalus humistratus groundcover milkvetch Fabaceae
Astragalus humistratus var. crispulus groundcover milkvetch Fabaceae
Astragalus humistratus var. hosackiae groundcover milkvetch Fabaceae
Astragalus humistratus var. humistratus groundcover milkvetch Fabaceae
Astragalus humistratus var. humivagans groundcover milkvetch Fabaceae
Astragalus humistratus var. sonorae groundcover milkvetch Fabaceae
Astragalus humistratus var. tenerrimus groundcover milkvetch Fabaceae
Astragalus hypoxylus Huachuca Mountain milkvetch Fabaceae
Astragalus insularis Cedros milkvetch Fabaceae
Astragalus insularis var. harwoodii Harwood's milkvetch Fabaceae
Astragalus kentrophyta spiny milkvetch Fabaceae
Astragalus kentrophyta var. coloradoensis Colorado spiny milkvetch Fabaceae
Astragalus kentrophyta var. elatus tall spiny milkvetch Fabaceae
Astragalus layneae widow's milkvetch Fabaceae
Astragalus lentiginosus freckled milkvetch Fabaceae
Astragalus lentiginosus var. ambiguus freckled milkvetch Fabaceae
Astragalus lentiginosus var. australis freckled milkvetch Fabaceae
Astragalus lentiginosus var. borreganus Borrego milkvetch Fabaceae
Astragalus lentiginosus var. diphysus freckled milkvetch Fabaceae
Astragalus lentiginosus var. maricopae Maricopa milkvetch Fabaceae
Astragalus lentiginosus var. oropedii freckled milkvetch Fabaceae
Astragalus lentiginosus var. palans freckled milkvetch Fabaceae
Astragalus lentiginosus var. stramineus freckled milkvetch Fabaceae
Astragalus lentiginosus var. trumbullensis Fabaceae
Astragalus lentiginosus var. vitreus freckled milkvetch Fabaceae
Astragalus lentiginosus var. wilsonii Wilson's milkvetch Fabaceae
Astragalus lentiginosus var. yuccanus yucca milkvetch Fabaceae
Astragalus lonchocarpus rushy milkvetch Fabaceae
Astragalus magdalenae satiny milkvetch Fabaceae
Astragalus magdalenae var. peirsonii Peirson's milkvetch Fabaceae
Astragalus miser timber milkvetch Fabaceae
Astragalus miser var. oblongifolius timber milkvetch Fabaceae
Astragalus moencoppensis Moenkopi milkvetch Fabaceae
Astragalus mokiacensis Mokiak milkvetch Fabaceae
Astragalus mollissimus woolly locoweed Fabaceae
Astragalus mollissimus var. bigelovii woolly locoweed Fabaceae
Astragalus mollissimus var. mogollonicus woolly locoweed Fabaceae
Astragalus mollissimus var. thompsoniae woolly locoweed Fabaceae
Astragalus monumentalis Monument Valley milkvetch Fabaceae
Astragalus monumentalis var. cottamii Cottam's milkvetch Fabaceae
Astragalus monumentalis var. monumentalis Monument Valley milkvetch Fabaceae
Astragalus newberryi Newberry's milkvetch Fabaceae
Astragalus newberryi var. aquarii Newberry's milkvetch Fabaceae
Astragalus newberryi var. blyae Newberry's milkvetch Fabaceae
Astragalus newberryi var. castoreus Newberry's milkvetch Fabaceae
Astragalus newberryi var. newberryi Newberry's milkvetch Fabaceae
Astragalus nothoxys sheep milkvetch Fabaceae
Astragalus nutriosensis Apache milkvetch Fabaceae
Astragalus nuttallianus smallflowered milkvetch Fabaceae
Astragalus nuttallianus var. austrinus smallflowered milkvetch Fabaceae
Astragalus nuttallianus var. cedrosensis turkeypeas Fabaceae
Astragalus nuttallianus var. imperfectus turkeypeas Fabaceae
Astragalus nuttallianus var. micranthiformis turkeypeas Fabaceae
Astragalus oophorus egg milkvetch Fabaceae
Astragalus oophorus var. caulescens egg milkvetch Fabaceae
Astragalus palmeri Palmer's milkvetch Fabaceae
Astragalus pattersonii Patterson's milkvetch Fabaceae
Astragalus pinonis pinyon milkvetch Fabaceae
Astragalus pinonis var. atwoodii Duane's milkvetch Fabaceae
Astragalus praelongus stinking milkvetch Fabaceae
Astragalus praelongus var. lonchopus stinking milkvetch Fabaceae
Astragalus praelongus var. praelongus stinking milkvetch Fabaceae
Astragalus preussii Preuss' milkvetch Fabaceae
Astragalus preussii var. laxiflorus Preuss' milkvetch Fabaceae
Astragalus preussii var. preussii Preuss' milkvetch Fabaceae
Astragalus recurvus recurved milkvetch Fabaceae
Astragalus rusbyi Rusby's milkvetch Fabaceae
Astragalus sabulonum gravel milkvetch Fabaceae
Astragalus scopulorum Rocky Mountain milkvetch Fabaceae
Astragalus sesquiflorus sandstone milkvetch Fabaceae
Astragalus sophoroides painted desert milkvetch Fabaceae
Astragalus straturensis Pine Valley milkvetch Fabaceae
Astragalus striatiflorus escarpment milkvetch Fabaceae
Astragalus subcinereus Silver's milkvetch Fabaceae
Astragalus tephrodes ashen milkvetch Fabaceae
Astragalus tephrodes var. brachylobus ashen milkvetch Fabaceae
Astragalus tephrodes var. chloridae ashen milkvetch Fabaceae
Astragalus tephrodes var. tephrodes ashen milkvetch Fabaceae
Astragalus tetrapterus fourwing milkvetch Fabaceae
Astragalus thurberi Thurber's milkvetch Fabaceae
Astragalus titanophilus limestone milkvetch Fabaceae
Astragalus toanus Toano milkvetch Fabaceae
Astragalus toanus var. scidulus Toano milkvetch Fabaceae
Astragalus troglodytus creeping milkvetch Fabaceae
Astragalus vaccarum Cow Spring milkvetch Fabaceae
Astragalus wingatanus Fort Wingate milkvetch Fabaceae
Astragalus xiphoides gladiator milkvetch Fabaceae
Astragalus zionis Zion milkvetch Fabaceae
Astragalus zionis var. zionis Zion milkvetch Fabaceae
Astrolepis cloakfern Pteridaceae
Astrolepis cochisensis Cochise scaly cloakfern Pteridaceae
Astrolepis cochisensis ssp. arizonica Arizona scaly cloakfern Pteridaceae
Astrolepis cochisensis ssp. cochisensis Cochise scaly cloakfern Pteridaceae
Astrolepis integerrima hybrid cloakfern Pteridaceae
Astrolepis sinuata wavy scaly cloakfern Pteridaceae
Astrolepis sinuata ssp. sinuata wavy scaly cloakfern Pteridaceae
Astrolepis windhamii Windham's scaly cloakfern Pteridaceae
Atamisquea atamisquea Capparaceae
Atamisquea emarginata vomitbush Capparaceae
Athyrium ladyfern Dryopteridaceae
Athyrium filix-femina common ladyfern Dryopteridaceae
Athyrium filix-femina ssp. cyclosorum subarctic ladyfern Dryopteridaceae
Athysanus sandweed Brassicaceae
Athysanus pusillus common sandweed Brassicaceae
Atrichoseris atrichoseris Asteraceae
Atrichoseris platyphylla parachute plant Asteraceae
Atriplex saltbush Chenopodiaceae
Atriplex acanthocarpa tubercled saltbush Chenopodiaceae
Atriplex acanthocarpa ssp. acanthocarpa tubercled saltbush Chenopodiaceae
Atriplex argentea silverscale saltbush Chenopodiaceae
Atriplex argentea ssp. argentea silverscale saltbush Chenopodiaceae
Atriplex argentea ssp. argentea var. argentea silverscale saltbush Chenopodiaceae
Atriplex argentea ssp. argentea var. caput-medusae stalked saltbush Chenopodiaceae
Atriplex argentea ssp. expansa silverscale saltbush Chenopodiaceae
Atriplex asterocarpa Chinle saltbush Chenopodiaceae
Atriplex canescens fourwing saltbush Chenopodiaceae
Atriplex canescens var. angustifolia fourwing saltbush Chenopodiaceae
Atriplex canescens var. canescens fourwing saltbush Chenopodiaceae
Atriplex canescens var. linearis thinleaf fourwing saltbush Chenopodiaceae
Atriplex confertifolia shadscale saltbush Chenopodiaceae
Atriplex cuneata valley saltbush Chenopodiaceae
Atriplex cuneata ssp. cuneata valley saltbush Chenopodiaceae
Atriplex elegans wheelscale saltbush Chenopodiaceae
Atriplex elegans var. elegans wheelscale saltbush Chenopodiaceae
Atriplex elegans var. fasciculata wheelscale saltbush Chenopodiaceae
Atriplex elegans var. thornberi wheelscale saltbush Chenopodiaceae
Atriplex garrettii Garrett's saltbush Chenopodiaceae
Atriplex griffithsii Griffiths' saltbush Chenopodiaceae
Atriplex hymenelytra desertholly Chenopodiaceae
Atriplex lentiformis big saltbush Chenopodiaceae
Atriplex lentiformis ssp. lentiformis big saltbush Chenopodiaceae
Atriplex navajoensis Navajo saltbush Chenopodiaceae
Atriplex obovata mound saltbush Chenopodiaceae
Atriplex pacifica Davidson's saltbush Chenopodiaceae
Atriplex phyllostegia leafcover saltweed Chenopodiaceae
Atriplex polycarpa cattle saltbush Chenopodiaceae
Atriplex powellii Powell's saltweed Chenopodiaceae
Atriplex prostrata triangle orache Chenopodiaceae
Atriplex rosea tumbling saltweed Chenopodiaceae
Atriplex saccaria sack saltbush Chenopodiaceae
Atriplex semibaccata Australian saltbush Chenopodiaceae
Atriplex serenana bractscale Chenopodiaceae
Atriplex serenana var. serenana bractscale Chenopodiaceae
Atriplex subspicata saline saltbush Chenopodiaceae
Atriplex torreyi Torrey's saltbush Chenopodiaceae
Atriplex wrightii Wright's saltbush Chenopodiaceae
Avena oat Poaceae
Avena barbata slender oat Poaceae
Avena fatua wild oat Poaceae
Avena sativa common oat Poaceae
Ayenia ayenia Sterculiaceae
Ayenia ardua wingstem ayenia Sterculiaceae
Ayenia compacta California ayenia Sterculiaceae
Ayenia filiformis Trans-Pecos ayenia Sterculiaceae
Ayenia glabra smooth ayenia Sterculiaceae
Ayenia insulicola dwarf ayenia Sterculiaceae
Ayenia microphylla dense ayenia Sterculiaceae
Azolla mosquitofern Azollaceae
Azolla filiculoides Pacific mosquitofern Azollaceae
Azolla mexicana Mexican mosquitofern Azollaceae
B
Baccharis baccharis Asteraceae
Baccharis bigelovii Bigelow's false willow Asteraceae
Baccharis brachyphylla shortleaf baccharis Asteraceae
Baccharis emoryi Emory's baccharis Asteraceae
Baccharis neglecta Rooseveltweed Asteraceae
Baccharis pteronioides yerba de pasmo Asteraceae
Baccharis salicifolia mule-fat Asteraceae
Baccharis sarothroides desertbroom Asteraceae
Baccharis sergiloides desert baccharis Asteraceae
Baccharis thesioides Arizona baccharis Asteraceae
Baccharis wrightii Wright's baccharis Asteraceae
Bacopa waterhyssop Scrophulariaceae
Bacopa monnieri herb of grace Scrophulariaceae
Bacopa rotundifolia disk waterhyssop Scrophulariaceae
Bahia bahia Asteraceae
Bahia absinthifolia hairyseed bahia Asteraceae
Bahia absinthifolia var. absinthifolia hairyseed bahia Asteraceae
Bahia absinthifolia var. dealbata Dealbata's bahia Asteraceae
Bahia biternata slimlobe bahia Asteraceae
Bahia dissecta ragleaf bahia Asteraceae
Baileya desert marigold Asteraceae
Baileya multiradiata desert marigold Asteraceae
Baileya pauciradiata laxflower Asteraceae
Baileya pleniradiata woolly desert marigold Asteraceae
Balsamorhiza balsamroot Asteraceae
Balsamorhiza hookeri Hooker's balsamroot Asteraceae
Balsamorhiza hookeri var. hispidula hairy balsamroot Asteraceae
Balsamorhiza sagittata arrowleaf balsamroot Asteraceae
Barbarea yellowrocket Brassicaceae
Barbarea orthoceras American yellowrocket Brassicaceae
Barkleyanthus willow ragwort Asteraceae
Barkleyanthus salicifolius willow ragwort Asteraceae
Bassia smotherweed Chenopodiaceae
Bassia americana green molly Chenopodiaceae
Bassia hyssopifolia fivehorn smotherweed Chenopodiaceae
Bassia prostrata forage kochia Chenopodiaceae
Bassia scoparia burningbush Chenopodiaceae
Bebbia sweetbush Asteraceae
Bebbia juncea sweetbush Asteraceae
Bebbia juncea var. aspera sweetbush Asteraceae
Beckmannia sloughgrass Poaceae
Beckmannia syzigachne American sloughgrass Poaceae
Berberis barberry Berberidaceae
Berberis harrisoniana Harrison's barberry Berberidaceae
Berberis wilcoxii Wilcox's barberry Berberidaceae
Berlandiera greeneyes Asteraceae
Berlandiera lyrata lyreleaf greeneyes Asteraceae
Bernardia myrtlecroton Euphorbiaceae
Bernardia myricifolia mouse's eye Euphorbiaceae
Berula waterparsnip Apiaceae
Berula erecta cutleaf waterparsnip Apiaceae
Besseya kittentail Scrophulariaceae
Besseya arizonica Arizona coraldrops Scrophulariaceae
Besseya plantaginea White River coraldrops Scrophulariaceae
Betula birch Betulaceae
Betula occidentalis water birch Betulaceae
Bidens beggarticks Asteraceae
Bidens aurea Arizona beggarticks Asteraceae
Bidens bigelovii Bigelow's beggarticks Asteraceae
Bidens bigelovii var. angustiloba Asteraceae
Bidens bigelovii var. bigelovii Bigelow's beggarticks Asteraceae
Bidens bipinnata Spanish needles Asteraceae
Bidens cernua nodding beggartick Asteraceae
Bidens ferulifolia Apache beggarticks Asteraceae
Bidens frondosa devil's beggartick Asteraceae
Bidens heterosperma Rocky Mountain beggarticks Asteraceae
Bidens laevis smooth beggartick Asteraceae
Bidens lemmonii Lemmon's beggarticks Asteraceae
Bidens leptocephala fewflower beggarticks Asteraceae
Bidens pilosa hairy beggarticks Asteraceae
Bidens tenuisecta slimlobe beggarticks Asteraceae
Blepharoneuron dropseed Poaceae
Blepharoneuron tricholepis pine dropseed Poaceae
Boehmeria false nettle Urticaceae
Boehmeria cylindrica smallspike false nettle Urticaceae
Boerhavia spiderling Nyctaginaceae
Boerhavia coccinea scarlet spiderling Nyctaginaceae
Boerhavia coulteri Coulter's spiderling Nyctaginaceae
Boerhavia erecta erect spiderling Nyctaginaceae
Boerhavia gracillima slimstalk spiderling Nyctaginaceae
Boerhavia intermedia fivewing spiderling Nyctaginaceae
Boerhavia megaptera Tucson Mountain spiderling Nyctaginaceae
Boerhavia pterocarpa Apache Pass spiderling Nyctaginaceae
Boerhavia purpurascens purple spiderling Nyctaginaceae
Boerhavia scandens climbing wartclub Nyctaginaceae
Boerhavia spicata creeping spiderling Nyctaginaceae
Boerhavia triquetra slender spiderling Nyctaginaceae
Boerhavia wrightii largebract spiderling Nyctaginaceae
Bommeria bommeria fern Pteridaceae
Bommeria hispida copper fern Pteridaceae
Bothriochloa beardgrass Poaceae
Bothriochloa barbinodis cane bluestem Poaceae
Bothriochloa ischaemum yellow bluestem Poaceae
Bothriochloa ischaemum var. songarica yellow bluestem Poaceae
Bothriochloa laguroides silver beardgrass Poaceae
Bothriochloa laguroides ssp. torreyana silver beardgrass Poaceae
Bothriochloa springfieldii Springfield's beardgrass Poaceae
Bothriochloa wrightii Wright's beardgrass Poaceae
Botrychium grapefern Ophioglossaceae
Botrychium crenulatum scalloped moonwort Ophioglossaceae
Botrychium echo reflected grapefern Ophioglossaceae
Botrychium hesperium western moonwort Ophioglossaceae
Botrychium lanceolatum lanceleaf grapefern Ophioglossaceae
Botrychium lanceolatum var. lanceolatum lanceleaf grapefern Ophioglossaceae
Botrychium lunaria common moonwort Ophioglossaceae
Botrychium minganense Mingan moonwort Ophioglossaceae
Botrychium multifidum leathery grapefern Ophioglossaceae
Botrychium pinnatum northern moonwort Ophioglossaceae
Botrychium virginianum rattlesnake fern Ophioglossaceae
Bouchea bouchea Verbenaceae
Bouchea prismatica prism bouchea Verbenaceae
Bouteloua grama Poaceae
Bouteloua aristidoides needle grama Poaceae
Bouteloua aristidoides var. aristidoides needle grama Poaceae
Bouteloua aristidoides var. arizonica Arizona needle grama Poaceae
Bouteloua barbata sixweeks grama Poaceae
Bouteloua chondrosioides sprucetop grama Poaceae
Bouteloua curtipendula sideoats grama Poaceae
Bouteloua curtipendula var. caespitosa sideoats grama Poaceae
Bouteloua curtipendula var. curtipendula sideoats grama Poaceae
Bouteloua dactyloides buffalograss Poaceae
Bouteloua diversispicula zacale Poaceae
Bouteloua eludens Santa Rita Mountain grama Poaceae
Bouteloua eriopoda black grama Poaceae
Bouteloua gracilis blue grama Poaceae
Bouteloua hirsuta hairy grama Poaceae
Bouteloua hirsuta var. hirsuta hairy grama Poaceae
Bouteloua parryi Parry's grama Poaceae
Bouteloua radicosa purple grama Poaceae
Bouteloua repens slender grama Poaceae
Bouteloua rothrockii Rothrock's grama Poaceae
Bouteloua simplex matted grama Poaceae
Bouteloua trifida red grama Poaceae
Bouteloua trifida var. trifida red grama Poaceae
Bouvardia bouvardia Rubiaceae
Bouvardia ternifolia firecrackerbush Rubiaceae
Bowlesia bowlesia Apiaceae
Bowlesia incana hoary bowlesia Apiaceae
Brachystigma desert foxglove Scrophulariaceae
Brachystigma wrightii Arizona desert foxglove Scrophulariaceae
Brandegea starvine Cucurbitaceae
Brandegea bigelovii desert starvine Cucurbitaceae
Brassica mustard Brassicaceae
Brassica juncea India mustard Brassicaceae
Brassica nigra black mustard Brassicaceae
Brassica rapa field mustard Brassicaceae
Brassica rapa var. rapa field mustard Brassicaceae
Brassica tournefortii Asian mustard Brassicaceae
Brickellia brickellbush Asteraceae
Brickellia amplexicaulis earleaf brickellbush Asteraceae
Brickellia amplexicaulis var. amplexicaulis earleaf brickellbush Asteraceae
Brickellia amplexicaulis var. lanceolata earleaf brickellbush Asteraceae
Brickellia atractyloides spearleaf brickellbush Asteraceae
Brickellia baccharidea resinleaf brickellbush Asteraceae
Brickellia betonicifolia betonyleaf brickellbush Asteraceae
Brickellia brachyphylla plumed brickellbush Asteraceae
Brickellia californica California brickellbush Asteraceae
Brickellia californica var. californica California brickellbush Asteraceae
Brickellia coulteri Coulter's brickellbush Asteraceae
Brickellia desertorum desert brickellbush Asteraceae
Brickellia eupatorioides false boneset Asteraceae
Brickellia eupatorioides var. chlorolepis false boneset Asteraceae
Brickellia floribunda Chihuahuan brickellbush Asteraceae
Brickellia frutescens shrubby brickellbush Asteraceae
Brickellia grandiflora tasselflower brickellbush Asteraceae
Brickellia incana woolly brickellbush Asteraceae
Brickellia lemmonii Lemmon's brickellbush Asteraceae
Brickellia lemmonii var. lemmonii Lemmon's brickellbush Asteraceae
Brickellia longifolia longleaf brickellbush Asteraceae
Brickellia longifolia var. longifolia longleaf brickellbush Asteraceae
Brickellia microphylla littleleaf brickellbush Asteraceae
Brickellia microphylla var. scabra rough brickellbush Asteraceae
Brickellia microphylla var. watsonii Watson's brickellbush Asteraceae
Brickellia oblongifolia Mojave brickellbush Asteraceae
Brickellia oblongifolia var. linifolia narrowleaf brickellbush Asteraceae
Brickellia parvula Mt. Davis brickellbush Asteraceae
Brickellia pringlei Pringle's brickellbush Asteraceae
Brickellia rusbyi stinking brickellbush Asteraceae
Brickellia simplex Sonoran brickellbush Asteraceae
Brickellia venosa veiny brickellbush Asteraceae
Brickelliastrum brickellbush Asteraceae
Brickelliastrum fendleri Fendler's brickellbush Asteraceae
Bromus brome Poaceae
Bromus arenarius Australian brome Poaceae
Bromus arizonicus Arizona brome Poaceae
Bromus arvensis field brome Poaceae
Bromus berteroanus Chilean chess Poaceae
Bromus catharticus rescuegrass Poaceae
Bromus ciliatus fringed brome Poaceae
Bromus ciliatus var. ciliatus fringed brome Poaceae
Bromus ciliatus var. richardsonii fringed brome Poaceae
Bromus diandrus ripgut brome Poaceae
Bromus diandrus ssp. rigidus ripgut brome Poaceae
Bromus frondosus weeping brome Poaceae
Bromus hordeaceus soft brome Poaceae
Bromus hordeaceus ssp. hordeaceus soft brome Poaceae
Bromus inermis smooth brome Poaceae
Bromus inermis ssp. inermis smooth brome Poaceae
Bromus inermis ssp. inermis var. inermis smooth brome Poaceae
Bromus lanatipes woolly brome Poaceae
Bromus madritensis compact brome Poaceae
Bromus marginatus mountain brome Poaceae
Bromus mucroglumis sharpglume brome Poaceae
Bromus orcuttianus Orcutt's brome Poaceae
Bromus polyanthus Great Basin brome Poaceae
Bromus polyanthus var. paniculatus Great Basin brome Poaceae
Bromus polyanthus var. polyanthus Great Basin brome Poaceae
Bromus porteri Porter brome Poaceae
Bromus racemosus bald brome Poaceae
Bromus rubens red brome Poaceae
Bromus secalinus rye brome Poaceae
Bromus secalinus var. secalinus rye brome Poaceae
Bromus sterilis poverty brome Poaceae
Bromus tectorum cheatgrass Poaceae
Browallia browallia Solanaceae
Browallia eludens bush-violet Solanaceae
Buchnera bluehearts Scrophulariaceae
Buchnera obliqua Arizona bluehearts Scrophulariaceae
Buddleja butterflybush Buddlejaceae
Buddleja scordioides escobilla butterflybush Buddlejaceae
Buddleja sessiliflora Rio Grande butterflybush Buddlejaceae
Buddleja utahensis Utah butterflybush Buddlejaceae
Bulbostylis hairsedge Cyperaceae
Bulbostylis capillaris densetuft hairsedge Cyperaceae
Bulbostylis capillaris ssp. capillaris densetuft hairsedge Cyperaceae
Bulbostylis funckii Funck's hairsedge Cyperaceae
Bulbostylis juncoides rush hairsedge Cyperaceae
Bupleurum bupleurum Apiaceae
Bupleurum lancifolium lanceleaf thorow wax Apiaceae
Bupleurum rotundifolium hare's ear Apiaceae
Bursera bursera Burseraceae
Bursera fagaroides fragrant bursera Burseraceae
Bursera fagaroides var. elongata fragrant bursera Burseraceae
Bursera microphylla elephant tree Burseraceae
C
Caesalpinia nicker Fabaceae
Caesalpinia gilliesii bird-of-paradise shrub Fabaceae
Caesalpinia mexicana Mexican holdback Fabaceae
Caesalpinia pulcherrima pride-of-Barbados Fabaceae
Calamagrostis reedgrass Poaceae
Calamagrostis canadensis bluejoint Poaceae
Calamagrostis canadensis var. canadensis bluejoint Poaceae
Calamagrostis scopulorum ditch reedgrass Poaceae
Calamagrostis stricta slimstem reedgrass Poaceae
Calamagrostis stricta ssp. inexpansa northern reedgrass Poaceae
Calamagrostis stricta ssp. stricta slimstem reedgrass Poaceae
Calamagrostis stricta ssp. stricta var. stricta slimstem reedgrass Poaceae
Calamovilfa sandreed Poaceae
Calamovilfa gigantea giant sandreed Poaceae
Calandrinia redmaids Portulacaceae
Calandrinia ciliata fringed redmaids Portulacaceae
Calibrachoa calibrachoa Solanaceae
Calibrachoa parviflora seaside petunia Solanaceae
Callaeum callaeum Malpighiaceae
Callaeum macropterum hillyhock Malpighiaceae
Calliandra stickpea Fabaceae
Calliandra eriophylla fairyduster Fabaceae
Calliandra humilis dwarf stickpea Fabaceae
Calliandra humilis var. humilis dwarf stickpea Fabaceae
Calliandra humilis var. reticulata dwarf stickpea Fabaceae
Callirhoe poppymallow Malvaceae
Callirhoe involucrata purple poppymallow Malvaceae
Callirhoe involucrata var. involucrata purple poppymallow Malvaceae
Callitriche water-starwort Callitrichaceae
Callitriche hermaphroditica northern water-starwort Callitrichaceae
Callitriche heterophylla twoheaded water-starwort Callitrichaceae
Callitriche heterophylla ssp. heterophylla twoheaded water-starwort Callitrichaceae
Callitriche palustris vernal water-starwort Callitrichaceae
Calochortus mariposa lily Liliaceae
Calochortus ambiguus doubting mariposa lily Liliaceae
Calochortus aureus golden mariposa lily Liliaceae
Calochortus flexuosus winding mariposa lily Liliaceae
Calochortus gunnisonii Gunnison's mariposa lily Liliaceae
Calochortus gunnisonii var. gunnisonii Gunnison's mariposa lily Liliaceae
Calochortus kennedyi desert mariposa lily Liliaceae
Calochortus kennedyi var. kennedyi desert mariposa lily Liliaceae
Calochortus nuttallii sego lily Liliaceae
Caltha marsh marigold Ranunculaceae
Caltha leptosepala white marsh marigold Ranunculaceae
Caltha leptosepala ssp. leptosepala white marsh marigold Ranunculaceae
Caltha leptosepala ssp. leptosepala var. leptosepala white marsh marigold Ranunculaceae
Calycoseris tackstem Asteraceae
Calycoseris parryi yellow tackstem Asteraceae
Calycoseris wrightii white tackstem Asteraceae
Calylophus sundrops Onagraceae
Calylophus hartwegii Hartweg's sundrops Onagraceae
Calylophus hartwegii ssp. fendleri Hartweg's sundrops Onagraceae
Calylophus hartwegii ssp. pubescens Hartweg's sundrops Onagraceae
Calylophus lavandulifolius lavenderleaf sundrops Onagraceae
Calylophus serrulatus yellow sundrops Onagraceae
Calylophus toumeyi Toumey's sundrops Onagraceae
Calypso fairy slipper Orchidaceae
Calypso bulbosa fairy slipper Orchidaceae
Calypso bulbosa var. americana fairy slipper Orchidaceae
Calyptocarpus calyptocarpus Asteraceae
Calyptocarpus vialis straggler daisy Asteraceae
Calystegia false bindweed Convolvulaceae
Calystegia longipes Paiute false bindweed Convolvulaceae
Calystegia macounii Macoun's false bindweed Convolvulaceae
Calystegia sepium hedge false bindweed Convolvulaceae
Calystegia sepium ssp. angulata hedge false bindweed Convolvulaceae
Camelina false flax Brassicaceae
Camelina microcarpa littlepod false flax Brassicaceae
Camelina sativa gold-of-pleasure Brassicaceae
Camelina sativa ssp. sativa gold-of-pleasure Brassicaceae
Camissonia suncup Onagraceae
Camissonia arenaria Fortuna Range suncup Onagraceae
Camissonia boothii Booth's evening primrose Onagraceae
Camissonia boothii ssp. alyssoides alyssum evening primrose Onagraceae
Camissonia boothii ssp. boothii Booth's suncup Onagraceae
Camissonia boothii ssp. condensata shredding suncup Onagraceae
Camissonia boothii ssp. decorticans shredding suncup Onagraceae
Camissonia brevipes yellow cups Onagraceae
Camissonia brevipes ssp. arizonica golden suncup Onagraceae
Camissonia brevipes ssp. brevipes golden suncup Onagraceae
Camissonia brevipes ssp. pallidula pallid suncup Onagraceae
Camissonia californica California suncup Onagraceae
Camissonia cardiophylla heartleaf suncup Onagraceae
Camissonia cardiophylla ssp. cardiophylla heartleaf suncup Onagraceae
Camissonia chamaenerioides longcapsule suncup Onagraceae
Camissonia claviformis browneyes Onagraceae
Camissonia claviformis ssp. aurantiaca browneyes Onagraceae
Camissonia claviformis ssp. claviformis browneyes Onagraceae
Camissonia claviformis ssp. peeblesii Peebles' browneyes Onagraceae
Camissonia claviformis ssp. peirsonii Peirson's browneyes Onagraceae
Camissonia claviformis ssp. rubescens browneyes Onagraceae
Camissonia claviformis ssp. yumae Yuma browneyes Onagraceae
Camissonia confertiflora Grand Canyon suncup Onagraceae
Camissonia confusa San Bernardino suncup Onagraceae
Camissonia eastwoodiae Grand Junction camissonia Onagraceae
Camissonia exilis Cottonwood Springs suncup Onagraceae
Camissonia gouldii Diamond Valley suncup Onagraceae
Camissonia multijuga froststem suncup Onagraceae
Camissonia pallida paleyellow suncup Onagraceae
Camissonia pallida ssp. pallida paleyellow suncup Onagraceae
Camissonia palmeri Palmer evening primrose Onagraceae
Camissonia parryi redclay suncup Onagraceae
Camissonia parvula Lewis River suncup Onagraceae
Camissonia pterosperma wingfruit suncup Onagraceae
Camissonia refracta narrowleaf suncup Onagraceae
Camissonia scapoidea Paiute suncup Onagraceae
Camissonia scapoidea ssp. macrocarpa Paiute suncup Onagraceae
Camissonia scapoidea ssp. scapoidea Paiute suncup Onagraceae
Camissonia specuicola Kaibab suncup Onagraceae
Camissonia specuicola ssp. hesperia Kaibab suncup Onagraceae
Camissonia specuicola ssp. specuicola Kaibab suncup Onagraceae
Camissonia walkeri Walker's suncup Onagraceae
Camissonia walkeri ssp. walkeri Walker's suncup Onagraceae
Campanula bellflower Campanulaceae
Campanula parryi Parry's bellflower Campanulaceae
Campanula parryi var. parryi Parry's bellflower Campanulaceae
Campanula rotundifolia bluebell bellflower Campanulaceae
Canavalia jackbean Fabaceae
Canavalia ensiformis wonderbean Fabaceae
Cannabis hemp Cannabaceae
Cannabis sativa marijuana Cannabaceae
Cannabis sativa ssp. sativa marijuana Cannabaceae
Cannabis sativa ssp. sativa var. sativa marijuana Cannabaceae
Canotia canotia Celastraceae
Canotia holacantha crucifixion thorn Celastraceae
Capsella capsella Brassicaceae
Capsella bursa-pastoris shepherd's purse Brassicaceae
Capsicum pepper Solanaceae
Capsicum annuum cayenne pepper Solanaceae
Capsicum annuum var. glabriusculum cayenne pepper Solanaceae
Cardamine bittercress Brassicaceae
Cardamine cordifolia heartleaf bittercress Brassicaceae
Cardamine cordifolia var. cordifolia heartleaf bittercress Brassicaceae
Cardamine hirsuta hairy bittercress Brassicaceae
Cardamine parviflora sand bittercress Brassicaceae
Cardamine parviflora var. arenicola sand bittercress Brassicaceae
Cardaria whitetop Brassicaceae
Cardaria draba whitetop Brassicaceae
Cardaria pubescens hairy whitetop Brassicaceae
Cardiospermum balloonvine Sapindaceae
Cardiospermum corindum faux persil Sapindaceae
Carduus plumeless thistle Asteraceae
Carduus nutans nodding plumeless thistle Asteraceae
Carex sedge Cyperaceae
Carex agrostoides grassleaf sedge Cyperaceae
Carex albonigra blackandwhite sedge Cyperaceae
Carex alma sturdy sedge Cyperaceae
Carex aquatilis water sedge Cyperaceae
Carex aquatilis var. aquatilis water sedge Cyperaceae
Carex atherodes wheat sedge Cyperaceae
Carex athrostachya slenderbeak sedge Cyperaceae
Carex aurea golden sedge Cyperaceae
Carex bella southwestern showy sedge Cyperaceae
Carex bolanderi Bolander's sedge Cyperaceae
Carex brevior shortbeak sedge Cyperaceae
Carex canescens silvery sedge Cyperaceae
Carex canescens ssp. canescens silvery sedge Cyperaceae
Carex chihuahuensis Chihuahuan sedge Cyperaceae
Carex conoidea openfield sedge Cyperaceae
Carex curatorum Kaibab sedge Cyperaceae
Carex disperma softleaf sedge Cyperaceae
Carex douglasii Douglas' sedge Cyperaceae
Carex duriuscula needleleaf sedge Cyperaceae
Carex ebenea ebony sedge Cyperaceae
Carex elynoides blackroot sedge Cyperaceae
Carex filifolia threadleaf sedge Cyperaceae
Carex geophila White Mountain sedge Cyperaceae
Carex hassei salt sedge Cyperaceae
Carex haydeniana cloud sedge Cyperaceae
Carex heteroneura different-nerve sedge Cyperaceae
Carex heteroneura var. chalciolepis Holm sedge Cyperaceae
Carex heteroneura var. epapillosa different-nerve sedge Cyperaceae
Carex hystericina bottlebrush sedge Cyperaceae
Carex interior inland sedge Cyperaceae
Carex lativena broadvein sedge Cyperaceae
Carex lenticularis lakeshore sedge Cyperaceae
Carex lenticularis var. lipocarpa Kellogg's sedge Cyperaceae
Carex leptopoda taperfruit shortscale sedge Cyperaceae
Carex leucodonta Huachuca Mountain sedge Cyperaceae
Carex mariposana Mariposa sedge Cyperaceae
Carex meadii Mead's sedge Cyperaceae
Carex microdonta littletooth sedge Cyperaceae
Carex microptera smallwing sedge Cyperaceae
Carex nebrascensis Nebraska sedge Cyperaceae
Carex occidentalis western sedge Cyperaceae
Carex oreocharis grassyslope sedge Cyperaceae
Carex pellita woolly sedge Cyperaceae
Carex petasata Liddon sedge Cyperaceae
Carex planostachys cedar sedge Cyperaceae
Carex praegracilis clustered field sedge Cyperaceae
Carex rossii Ross' sedge Cyperaceae
Carex scoparia broom sedge Cyperaceae
Carex scoparia var. scoparia broom sedge Cyperaceae
Carex scopulorum mountain sedge Cyperaceae
Carex scopulorum var. bracteosa mountain sedge Cyperaceae
Carex senta swamp carex Cyperaceae
Carex serratodens twotooth sedge Cyperaceae
Carex siccata dryspike sedge Cyperaceae
Carex simulata analogue sedge Cyperaceae
Carex specuicola Navajo sedge Cyperaceae
Carex spissa San Diego sedge Cyperaceae
Carex stipata awlfruit sedge Cyperaceae
Carex stipata var. stipata owlfruit sedge Cyperaceae
Carex subfusca brown sedge Cyperaceae
Carex tahoensis Tahoe sedge Cyperaceae
Carex thurberi Thurber's sedge Cyperaceae
Carex ultra Cochise sedge Cyperaceae
Carex vallicola valley sedge Cyperaceae
Carex vallicola var. rusbyi Rusby's sedge Cyperaceae
Carex vesicaria blister sedge Cyperaceae
Carex vesicaria var. vesicaria blister sedge Cyperaceae
Carex vulpinoidea fox sedge Cyperaceae
Carex vulpinoidea var. vulpinoidea fox sedge Cyperaceae
Carex wootonii Wooton's sedge Cyperaceae
Carlowrightia wrightwort Acanthaceae
Carlowrightia arizonica Arizona wrightwort Acanthaceae
Carlowrightia linearifolia heath wrightwort Acanthaceae
Carminatia carminatia Asteraceae
Carminatia tenuiflora plumeweed Asteraceae
Carnegiea saguaro Cactaceae
Carnegiea gigantea saguaro Cactaceae
Carphochaete bristlehead Asteraceae
Carphochaete bigelovii Bigelow's bristlehead Asteraceae
Carthamus distaff thistle Asteraceae
Carthamus lanatus woolly distaff thistle Asteraceae
Carthamus lanatus ssp. creticus woolly distaff thistle Asteraceae
Carthamus tinctorius safflower Asteraceae
Castalis castalis Asteraceae
Castalis tragus Cape marigold Asteraceae
Castela castela Simaroubaceae
Castela emoryi crucifixion thorn Simaroubaceae
Castilleja Indian paintbrush Scrophulariaceae
Castilleja angustifolia northwestern Indian paintbrush Scrophulariaceae
Castilleja angustifolia var. dubia Scrophulariaceae
Castilleja attenuata attenuate Indian paintbrush Scrophulariaceae
Castilleja austromontana Rincon Mountain Indian paintbrush Scrophulariaceae
Castilleja exserta exserted Indian paintbrush Scrophulariaceae
Castilleja exserta ssp. exserta exserted Indian paintbrush Scrophulariaceae
Castilleja integra wholeleaf Indian paintbrush Scrophulariaceae
Castilleja integra var. gloriosa wholeleaf Indian paintbrush Scrophulariaceae
Castilleja integra var. integra wholeleaf Indian paintbrush Scrophulariaceae
Castilleja kaibabensis Kaibab Plateau Indian paintbrush Scrophulariaceae
Castilleja lanata Sierra woolly Indian paintbrush Scrophulariaceae
Castilleja lanata ssp. lanata Sierra woolly Indian paintbrush Scrophulariaceae
Castilleja linariifolia Wyoming Indian paintbrush Scrophulariaceae
Castilleja lineata marshmeadow Indian paintbrush Scrophulariaceae
Castilleja miniata giant red Indian paintbrush Scrophulariaceae
Castilleja miniata ssp. miniata giant red Indian paintbrush Scrophulariaceae
Castilleja minor lesser Indian paintbrush Scrophulariaceae
Castilleja minor ssp. minor lesser Indian paintbrush Scrophulariaceae
Castilleja minor ssp. spiralis lesser Indian paintbrush Scrophulariaceae
Castilleja nervata Trans-Pecos Indian paintbrush Scrophulariaceae
Castilleja patriotica Huachuca Mountain Indian paintbrush Scrophulariaceae
Castilleja sessiliflora downy paintedcup Scrophulariaceae
Castilleja sulphurea sulphur Indian paintbrush Scrophulariaceae
Castilleja tenuiflora Santa Catalina Indian paintbrush Scrophulariaceae
Catabrosa whorlgrass Poaceae
Catabrosa aquatica water whorlgrass Poaceae
Catabrosa aquatica var. aquatica water whorlgrass Poaceae
Catalpa catalpa Bignoniaceae
Catalpa bignonioides southern catalpa Bignoniaceae
Cathestecum false grama Poaceae
Cathestecum erectum false grama Poaceae
Caulanthus wild cabbage Brassicaceae
Caulanthus cooperi Cooper's wild cabbage Brassicaceae
Ceanothus ceanothus Rhamnaceae
Ceanothus fendleri Fendler's ceanothus Rhamnaceae
Ceanothus greggii desert ceanothus Rhamnaceae
Ceanothus greggii var. greggii desert ceanothus Rhamnaceae
Ceanothus greggii var. perplexans desert ceanothus Rhamnaceae
Ceanothus greggii var. vestitus Mojave ceanothus Rhamnaceae
Ceanothus integerrimus deerbrush Rhamnaceae
Ceanothus martinii Martin's ceanothus Rhamnaceae
Celtis hackberry Ulmaceae
Celtis ehrenbergiana spiny hackberry Ulmaceae
Celtis laevigata sugarberry Ulmaceae
Celtis laevigata var. brevipes sugarberry Ulmaceae
Celtis laevigata var. reticulata netleaf hackberry Ulmaceae
Cenchrus sandbur Poaceae
Cenchrus echinatus southern sandbur Poaceae
Cenchrus longispinus mat sandbur Poaceae
Cenchrus spinifex coastal sandbur Poaceae
Centaurea knapweed Asteraceae
Centaurea americana American star-thistle Asteraceae
Centaurea calcitrapa red star-thistle Asteraceae
Centaurea cyanus garden cornflower Asteraceae
Centaurea diffusa diffuse knapweed Asteraceae
Centaurea melitensis Maltese star-thistle Asteraceae
Centaurea rothrockii Rothrock's knapweed Asteraceae
Centaurea solstitialis yellow star-thistle Asteraceae
Centaurea stoebe spotted knapweed Asteraceae
Centaurea stoebe ssp. micranthos spotted knapweed Asteraceae
Centaurium centaury Gentianaceae
Centaurium arizonicum Arizona centaury Gentianaceae
Centaurium exaltatum desert centaury Gentianaceae
Centaurium nudicaule Santa Catalina Mountain centaury Gentianaceae
Centranthus centranthus Valerianaceae
Centranthus ruber red valerian Valerianaceae
Centromadia Asteraceae
Centromadia pungens common tarweed Asteraceae
Centromadia pungens ssp. pungens common tarweed Asteraceae
Centrostegia centrostegia Polygonaceae
Centrostegia thurberi red triangles Polygonaceae
Cephalanthus buttonbush Rubiaceae
Cephalanthus occidentalis common buttonbush Rubiaceae
Cerastium mouse-ear chickweed Caryophyllaceae
Cerastium arvense field chickweed Caryophyllaceae
Cerastium arvense ssp. strictum field chickweed Caryophyllaceae
Cerastium beeringianum Bering chickweed Caryophyllaceae
Cerastium beeringianum ssp. earlei Bering chickweed Caryophyllaceae
Cerastium brachypodum shortstalk chickweed Caryophyllaceae
Cerastium fontanum common mouse-ear chickweed Caryophyllaceae
Cerastium fontanum ssp. vulgare big chickweed Caryophyllaceae
Cerastium gracile slender chickweed Caryophyllaceae
Cerastium nutans nodding chickweed Caryophyllaceae
Cerastium nutans var. nutans nodding chickweed Caryophyllaceae
Cerastium nutans var. obtectum nodding chickweed Caryophyllaceae
Cerastium sordidum Chihuahuan chickweed Caryophyllaceae
Cerastium texanum Texas chickweed Caryophyllaceae
Ceratocephala curveseed butterwort Ranunculaceae
Ceratocephala testiculata curveseed butterwort Ranunculaceae
Ceratonia ceratonia Fabaceae
Ceratonia siliqua St. John's bread Fabaceae
Ceratophyllum hornwort Ceratophyllaceae
Ceratophyllum demersum coon's tail Ceratophyllaceae
Cercis redbud Fabaceae
Cercis orbiculata California redbud Fabaceae
Cercocarpus mountain mahogany Rosaceae
Cercocarpus intricatus littleleaf mountain mahogany Rosaceae
Cercocarpus ledifolius curl-leaf mountain mahogany Rosaceae
Cercocarpus ledifolius var. intercedens curl-leaf mountain mahogany Rosaceae
Cercocarpus ledifolius var. ledifolius curl-leaf mountain mahogany Rosaceae
Cercocarpus montanus alderleaf mountain mahogany Rosaceae
Cercocarpus montanus var. glaber birchleaf mountain mahogany Rosaceae
Cercocarpus montanus var. montanus alderleaf mountain mahogany Rosaceae
Cercocarpus montanus var. paucidentatus hairy mountain mahogany Rosaceae
Cevallia stinging serpent Loasaceae
Cevallia sinuata stinging serpent Loasaceae
Chaenactis pincushion Asteraceae
Chaenactis carphoclinia pebble pincushion Asteraceae
Chaenactis carphoclinia var. carphoclinia pebble pincushion Asteraceae
Chaenactis douglasii Douglas' dustymaiden Asteraceae
Chaenactis douglasii var. douglasii Douglas' dustymaiden Asteraceae
Chaenactis fremontii pincushion flower Asteraceae
Chaenactis macrantha bighead dustymaiden Asteraceae
Chaenactis stevioides Esteve's pincushion Asteraceae
Chaenactis xantiana fleshcolor pincushion Asteraceae
Chaerophyllum chervil Apiaceae
Chaerophyllum tainturieri hairyfruit chervil Apiaceae
Chaerophyllum tainturieri var. tainturieri hairyfruit chervil Apiaceae
Chaetopappa leastdaisy Asteraceae
Chaetopappa ericoides rose heath Asteraceae
Chamaebatiaria desert sweet Rosaceae
Chamaebatiaria millefolium desert sweet Rosaceae
Chamaechaenactis chamaechaenactis Asteraceae
Chamaechaenactis scaposa fullstem Asteraceae
Chamaechaenactis scaposa var. scaposa fullstem Asteraceae
Chamaecrista sensitive pea Fabaceae
Chamaecrista absus tropical sensitive pea Fabaceae
Chamaecrista absus var. meonandra tropical sensitive pea Fabaceae
Chamaecrista nictitans sensitive partridge pea Fabaceae
Chamaecrista nictitans ssp. nictitans sensitive partridge pea Fabaceae
Chamaecrista nictitans ssp. nictitans var. leptadenia sensitive partridge pea Fabaceae
Chamaecrista serpens slender sensitive pea Fabaceae
Chamaecrista serpens var. wrightii Wright's sensitive pea Fabaceae
Chamaesaracha five eyes Solanaceae
Chamaesaracha coronopus greenleaf five eyes Solanaceae
Chamaesaracha sordida hairy five eyes Solanaceae
Chamaesyce sandmat Euphorbiaceae
Chamaesyce abramsiana Abrams' sandmat Euphorbiaceae
Chamaesyce albomarginata whitemargin sandmat Euphorbiaceae
Chamaesyce arizonica Arizona sandmat Euphorbiaceae
Chamaesyce capitellata head sandmat Euphorbiaceae
Chamaesyce chaetocalyx bristlecup sandmat Euphorbiaceae
Chamaesyce chaetocalyx var. chaetocalyx bristlecup sandmat Euphorbiaceae
Chamaesyce dioica royal sandmat Euphorbiaceae
Chamaesyce fendleri Fendler's sandmat Euphorbiaceae
Chamaesyce florida Chiricahua Mountain sandmat Euphorbiaceae
Chamaesyce glyptosperma ribseed sandmat Euphorbiaceae
Chamaesyce gracillima Mexican sandmat Euphorbiaceae
Chamaesyce hirta pillpod sandmat Euphorbiaceae
Chamaesyce hypericifolia graceful sandmat Euphorbiaceae
Chamaesyce hyssopifolia hyssopleaf sandmat Euphorbiaceae
Chamaesyce maculata spotted sandmat Euphorbiaceae
Chamaesyce melanadenia red-gland spurge Euphorbiaceae
Chamaesyce micromera Sonoran sandmat Euphorbiaceae
Chamaesyce ocellata Contura Creek sandmat Euphorbiaceae
Chamaesyce ocellata ssp. arenicola Contura Creek sandmat Euphorbiaceae
Chamaesyce parryi Parry's sandmat Euphorbiaceae
Chamaesyce pediculifera Carrizo Mountain sandmat Euphorbiaceae
Chamaesyce platysperma flatseed sandmat Euphorbiaceae
Chamaesyce polycarpa smallseed sandmat Euphorbiaceae
Chamaesyce prostrata prostrate sandmat Euphorbiaceae
Chamaesyce revoluta threadstem sandmat Euphorbiaceae
Chamaesyce serpens matted sandmat Euphorbiaceae
Chamaesyce serpyllifolia thymeleaf sandmat Euphorbiaceae
Chamaesyce serpyllifolia ssp. serpyllifolia thymeleaf sandmat Euphorbiaceae
Chamaesyce serrula sawtooth sandmat Euphorbiaceae
Chamaesyce setiloba Yuma sandmat Euphorbiaceae
Chamaesyce stictospora slimseed sandmat Euphorbiaceae
Chamaesyce trachysperma San Pedro River sandmat Euphorbiaceae
Chamaesyce vermiculata wormseed sandmat Euphorbiaceae
Chamerion fireweed Onagraceae
Chamerion angustifolium fireweed Onagraceae
Chamerion angustifolium ssp. circumvagum fireweed Onagraceae
Chasmanthium woodoats Poaceae
Chasmanthium latifolium Indian woodoats Poaceae
Cheilanthes lipfern Pteridaceae
Cheilanthes alabamensis Alabama lipfern Pteridaceae
Cheilanthes arizonica Arizona lipfern Pteridaceae
Cheilanthes bonariensis golden lipfern Pteridaceae
Cheilanthes covillei Coville's lipfern Pteridaceae
Cheilanthes eatonii Eaton's lipfern Pteridaceae
Cheilanthes feei slender lipfern Pteridaceae
Cheilanthes fendleri Fendler's lipfern Pteridaceae
Cheilanthes lendigera nitbearing lipfern Pteridaceae
Cheilanthes lindheimeri fairyswords Pteridaceae
Cheilanthes parishii Pteridaceae
Cheilanthes parryi Parry's lipfern Pteridaceae
Cheilanthes pringlei Pringle's lipfern Pteridaceae
Cheilanthes tomentosa woolly lipfern Pteridaceae
Cheilanthes villosa villous lipfern Pteridaceae
Cheilanthes wootonii beaded lipfern Pteridaceae
Cheilanthes wrightii Wright's lipfern Pteridaceae
Cheilanthes yavapensis graceful lipfern Pteridaceae
Chenopodium goosefoot Chenopodiaceae
Chenopodium album lambsquarters Chenopodiaceae
Chenopodium album var. album lambsquarters Chenopodiaceae
Chenopodium ambrosioides Mexican tea Chenopodiaceae
Chenopodium ambrosioides var. ambrosioides Mexican tea Chenopodiaceae
Chenopodium atrovirens pinyon goosefoot Chenopodiaceae
Chenopodium berlandieri pitseed goosefoot Chenopodiaceae
Chenopodium berlandieri var. berlandieri pitseed goosefoot Chenopodiaceae
Chenopodium berlandieri var. sinuatum pitseed goosefoot Chenopodiaceae
Chenopodium berlandieri var. zschackii Zschack's goosefoot Chenopodiaceae
Chenopodium botrys Jerusalem oak goosefoot Chenopodiaceae
Chenopodium capitatum blite goosefoot Chenopodiaceae
Chenopodium desiccatum aridland goosefoot Chenopodiaceae
Chenopodium ficifolium figleaf goosefoot Chenopodiaceae
Chenopodium fremontii Fremont's goosefoot Chenopodiaceae
Chenopodium fremontii var. fremontii Fremont's goosefoot Chenopodiaceae
Chenopodium graveolens fetid goosefoot Chenopodiaceae
Chenopodium hians hians goosefoot Chenopodiaceae
Chenopodium incanum mealy goosefoot Chenopodiaceae
Chenopodium incanum var. elatum mealy goosefoot Chenopodiaceae
Chenopodium incanum var. incanum mealy goosefoot Chenopodiaceae
Chenopodium incanum var. occidentale mealy goosefoot Chenopodiaceae
Chenopodium leptophyllum narrowleaf goosefoot Chenopodiaceae
Chenopodium murale nettleleaf goosefoot Chenopodiaceae
Chenopodium neomexicanum New Mexico goosefoot Chenopodiaceae
Chenopodium neomexicanum var. neomexicanum New Mexico goosefoot Chenopodiaceae
Chenopodium pratericola desert goosefoot Chenopodiaceae
Chenopodium pumilio clammy goosefoot Chenopodiaceae
Chenopodium rubrum red goosefoot Chenopodiaceae
Chenopodium salinum Rocky Mountain goosefoot Chenopodiaceae
Chenopodium watsonii Watson's goosefoot Chenopodiaceae
Chilopsis desert willow Bignoniaceae
Chilopsis linearis desert willow Bignoniaceae
Chilopsis linearis ssp. arcuata desert willow Bignoniaceae
Chimaphila prince's pine Pyrolaceae
Chimaphila maculata striped prince's pine Pyrolaceae
Chimaphila umbellata pipsissewa Pyrolaceae
Chimaphila umbellata ssp. acuta pipsissewa Pyrolaceae
Chloracantha chloracantha Asteraceae
Chloracantha spinosa spiny chloracantha Asteraceae
Chloris windmill grass Poaceae
Chloris cucullata hooded windmill grass Poaceae
Chloris gayana Rhodes grass Poaceae
Chloris subdolichostachya shortspike windmill grass Poaceae
Chloris verticillata tumble windmill grass Poaceae
Chloris virgata feather fingergrass Poaceae
Choisya Mexican orange Rutaceae
Choisya dumosa Mexican orange Rutaceae
Choisya dumosa var. arizonica Arizonia orange Rutaceae
Choisya dumosa var. mollis Mexican orange Rutaceae
Chorispora chorispora Brassicaceae
Chorispora tenella crossflower Brassicaceae
Chorizanthe spineflower Polygonaceae
Chorizanthe brevicornu brittle spineflower Polygonaceae
Chorizanthe brevicornu var. brevicornu brittle spineflower Polygonaceae
Chorizanthe corrugata wrinkled spineflower Polygonaceae
Chorizanthe rigida devil's spineflower Polygonaceae
Chorizanthe watsonii fivetooth spineflower Polygonaceae
Chromolaena thoroughwort Asteraceae
Chromolaena bigelovii Bigelow's thoroughwort Asteraceae
Chrysothamnus rabbitbrush Asteraceae
Chrysothamnus baileyi Bailey's rabbitbrush Asteraceae
Chrysothamnus depressus longflower rabbitbrush Asteraceae
Chrysothamnus greenei Greene's rabbitbrush Asteraceae
Chrysothamnus linifolius spearleaf rabbitbrush Asteraceae
Chrysothamnus molestus Arizona rabbitbrush Asteraceae
Chrysothamnus viscidiflorus yellow rabbitbrush Asteraceae
Chrysothamnus viscidiflorus ssp. axillaris yellow rabbitbrush Asteraceae
Chrysothamnus viscidiflorus ssp. lanceolatus yellow rabbitbrush Asteraceae
Chrysothamnus viscidiflorus ssp. planifolius yellow rabbitbrush Asteraceae
Chrysothamnus viscidiflorus ssp. puberulus yellow rabbitbrush Asteraceae
Chrysothamnus viscidiflorus ssp. viscidiflorus yellow rabbitbrush Asteraceae
Chrysothamnus viscidiflorus ssp. viscidiflorus var. stenophyllus yellow rabbitbrush Asteraceae
Chrysothamnus viscidiflorus ssp. viscidiflorus var. viscidiflorus yellow rabbitbrush Asteraceae
Cichorium chicory Asteraceae
Cichorium intybus chicory Asteraceae
Cicuta water hemlock Apiaceae
Cicuta maculata spotted water hemlock Apiaceae
Cicuta maculata var. angustifolia spotted water hemlock Apiaceae
Cicuta maculata var. bolanderi spotted water hemlock Apiaceae
Cicuta maculata var. maculata spotted water hemlock Apiaceae
Cinna woodreed Poaceae
Cinna latifolia drooping woodreed Poaceae
Circaea enchanter's nightshade Onagraceae
Circaea alpina small enchanter's nightshade Onagraceae
Circaea alpina ssp. alpina small enchanter's nightshade Onagraceae
Circaea alpina ssp. pacifica small enchanter's nightshade Onagraceae
Cirsium thistle Asteraceae
Cirsium arizonicum Arizona thistle Asteraceae
Cirsium arvense Canada thistle Asteraceae
Cirsium chellyense queen thistle Asteraceae
Cirsium chuskaense monarch thistle Asteraceae
Cirsium grahamii Graham's thistle Asteraceae
Cirsium mohavense Mojave thistle Asteraceae
Cirsium navajoense Navajo thistle Asteraceae
Cirsium neomexicanum New Mexico thistle Asteraceae
Cirsium ochrocentrum yellowspine thistle Asteraceae
Cirsium ochrocentrum ssp. martinii Asteraceae
Cirsium ochrocentrum ssp. ochrocentrum yellowspine thistle Asteraceae
Cirsium parryi Parry's thistle Asteraceae
Cirsium parryi ssp. mogollonicum Mogollon thistle Asteraceae
Cirsium parryi ssp. parryi Parry's thistle Asteraceae
Cirsium rothrockii Rothrock's thistle Asteraceae
Cirsium rusbyi Rusby's thistle Asteraceae
Cirsium rydbergii Rydberg's thistle Asteraceae
Cirsium scariosum meadow thistle Asteraceae
Cirsium undulatum wavyleaf thistle Asteraceae
Cirsium undulatum var. undulatum wavyleaf thistle Asteraceae
Cirsium virginense virgin thistle Asteraceae
Cirsium vulgare bull thistle Asteraceae
Cirsium wheeleri Wheeler's thistle Asteraceae
Cirsium wrightii Wright's thistle Asteraceae
Cissus treebine Vitaceae
Cissus trifoliata sorrelvine Vitaceae
Cistanthe pussypaws Portulacaceae
Cistanthe ambigua desert pussypaws Portulacaceae
Cistanthe monandra common pussypaws Portulacaceae
Cistanthe parryi Parry's pussypaws Portulacaceae
Cistanthe parryi var. arizonica Arizona pussypaws Portulacaceae
Citrullus watermelon Cucurbitaceae
Citrullus lanatus watermelon Cucurbitaceae
Citrullus lanatus var. lanatus watermelon Cucurbitaceae
Cladium sawgrass Cyperaceae
Cladium californicum California sawgrass Cyperaceae
Clarkia clarkia Onagraceae
Clarkia epilobioides canyon clarkia Onagraceae
Clarkia purpurea winecup clarkia Onagraceae
Clarkia purpurea ssp. quadrivulnera winecup clarkia Onagraceae
Clarkia rhomboidea diamond clarkia Onagraceae
Claytonia springbeauty Portulacaceae
Claytonia parviflora streambank springbeauty Portulacaceae
Claytonia parviflora ssp. parviflora streambank springbeauty Portulacaceae
Claytonia parviflora ssp. utahensis streambank springbeauty Portulacaceae
Claytonia perfoliata miner's lettuce Portulacaceae
Claytonia perfoliata ssp. intermontana miner's lettuce Portulacaceae
Claytonia perfoliata ssp. mexicana miner's lettuce Portulacaceae
Claytonia perfoliata ssp. perfoliata miner's lettuce Portulacaceae
Claytonia rosea western springbeauty Portulacaceae
Claytonia rubra redstem springbeauty Portulacaceae
Claytonia rubra ssp. depressa redstem springbeauty Portulacaceae
Claytonia rubra ssp. rubra redstem springbeauty Portulacaceae
Clematis leather flower Ranunculaceae
Clematis bigelovii Bigelow's leather flower Ranunculaceae
Clematis columbiana rock clematis Ranunculaceae
Clematis columbiana var. columbiana rock clematis Ranunculaceae
Clematis drummondii Drummond's clematis Ranunculaceae
Clematis hirsutissima hairy clematis Ranunculaceae
Clematis hirsutissima var. arizonica Arizona clematis Ranunculaceae
Clematis hirsutissima var. hirsutissima hairy clematis Ranunculaceae
Clematis ligusticifolia western white clematis Ranunculaceae
Clematis ligusticifolia var. ligusticifolia western white clematis Ranunculaceae
Clematis palmeri Palmer's leather flower Ranunculaceae
Cleome spiderflower Capparaceae
Cleome isomeris bladderpod spiderflower Capparaceae
Cleome lutea yellow spiderflower Capparaceae
Cleome lutea var. jonesii Jones spiderflower Capparaceae
Cleome lutea var. lutea yellow spiderflower Capparaceae
Cleome multicaulis slender spiderflower Capparaceae
Cleome serrulata Rocky Mountain beeplant Capparaceae
Cleomella stinkweed Capparaceae
Cleomella longipes Chiricahua Mountain stinkweed Capparaceae
Cleomella obtusifolia Mojave cleomella Capparaceae
Cleomella parviflora slender cleomella Capparaceae
Cleomella plocasperma twisted cleomella Capparaceae
Clinopodium clinopodium Lamiaceae
Clinopodium vulgare wild basil Lamiaceae
Clitoria pigeonwings Fabaceae
Clitoria mariana Atlantic pigeonwings Fabaceae
Cnicus cnicus Asteraceae
Cnicus benedictus blessed thistle Asteraceae
Cnidoscolus cnidoscolus Euphorbiaceae
Cnidoscolus angustidens mala mujer Euphorbiaceae
Cocculus coralbead Menispermaceae
Cocculus diversifolius snailseed Menispermaceae
Coleogyne coleogyne Rosaceae
Coleogyne ramosissima blackbrush Rosaceae
Collinsia blue eyed Mary Scrophulariaceae
Collinsia parviflora maiden blue eyed Mary Scrophulariaceae
Collomia trumpet Polemoniaceae
Collomia grandiflora grand collomia Polemoniaceae
Collomia linearis tiny trumpet Polemoniaceae
Cologania cologania Fabaceae
Cologania angustifolia longleaf cologania Fabaceae
Cologania obovata Lemmon's cologania Fabaceae
Cologania pallida pale cologania Fabaceae
Colubrina nakedwood Rhamnaceae
Colubrina californica Las Animas nakedwood Rhamnaceae
Comandra bastard toadflax Santalaceae
Comandra umbellata bastard toadflax Santalaceae
Comandra umbellata ssp. californica California bastard toadflax Santalaceae
Comandra umbellata ssp. pallida pale bastard toadflax Santalaceae
Commelina dayflower Commelinaceae
Commelina dianthifolia birdbill dayflower Commelinaceae
Commelina dianthifolia var. dianthifolia birdbill dayflower Commelinaceae
Commelina dianthifolia var. longispatha birdbill dayflower Commelinaceae
Commelina erecta whitemouth dayflower Commelinaceae
Commelina erecta var. angustifolia whitemouth dayflower Commelinaceae
Commelina erecta var. deamiana whitemouth dayflower Commelinaceae
Commelina erecta var. erecta whitemouth dayflower Commelinaceae
Condalia snakewood Rhamnaceae
Condalia correllii Correll's snakewood Rhamnaceae
Condalia ericoides javelina bush Rhamnaceae
Condalia globosa bitter snakewood Rhamnaceae
Condalia globosa var. pubescens bitter snakewood Rhamnaceae
Condalia warnockii Warnock's snakewood Rhamnaceae
Condalia warnockii var. kearneyana Kearney's snakewood Rhamnaceae
Conioselinum hemlockparsley Apiaceae
Conioselinum mexicanum Mexican hemlockparsley Apiaceae
Conioselinum scopulorum Rocky Mountain hemlockparsley Apiaceae
Conium poison hemlock Apiaceae
Conium maculatum poison hemlock Apiaceae
Conoclinium thoroughwort Asteraceae
Conoclinium greggii palmleaf thoroughwort Asteraceae
Conopholis cancer-root Orobanchaceae
Conopholis alpina alpine cancer-root Orobanchaceae
Conopholis alpina var. mexicana Mexican cancer-root Orobanchaceae
Conringia hare's ear mustard Brassicaceae
Conringia orientalis hare's ear mustard Brassicaceae
Consolida knight's-spur Ranunculaceae
Consolida ajacis doubtful knight's-spur Ranunculaceae
Convolvulus bindweed Convolvulaceae
Convolvulus arvensis field bindweed Convolvulaceae
Convolvulus equitans Texas bindweed Convolvulaceae
Conyza horseweed Asteraceae
Conyza bonariensis asthmaweed Asteraceae
Conyza canadensis Canadian horseweed Asteraceae
Conyza canadensis var. canadensis Canadian horseweed Asteraceae
Conyza canadensis var. glabrata Canadian horseweed Asteraceae
Conyza canadensis var. pusilla Canadian horseweed Asteraceae
Corallorhiza coralroot Orchidaceae
Corallorhiza maculata summer coralroot Orchidaceae
Corallorhiza maculata var. maculata summer coralroot Orchidaceae
Corallorhiza maculata var. occidentalis summer coralroot Orchidaceae
Corallorhiza striata hooded coralroot Orchidaceae
Corallorhiza striata var. vreelandii Vreeland's coralroot Orchidaceae
Corallorhiza wisteriana spring coralroot Orchidaceae
Corchorus corchorus Tiliaceae
Corchorus hirtus Orinoco jute Tiliaceae
Cordia cordia Boraginaceae
Cordia parvifolia small-leaf geigertree Boraginaceae
Cordylanthus bird's-beak Scrophulariaceae
Cordylanthus laxiflorus nodding bird's-beak Scrophulariaceae
Cordylanthus nevinii Nevin's bird's-beak Scrophulariaceae
Cordylanthus parviflorus purple bird's-beak Scrophulariaceae
Cordylanthus wrightii Wright's bird's beak Scrophulariaceae
Cordylanthus wrightii ssp. kaibabensis Kaibab bird's beak Scrophulariaceae
Cordylanthus wrightii ssp. tenuifolius Wright's bird's beak Scrophulariaceae
Cordylanthus wrightii ssp. wrightii Wright's bird's beak Scrophulariaceae
Coreocarpus coreocarpus Asteraceae
Coreocarpus arizonicus little lemonhead Asteraceae
Coreopsis tickseed Asteraceae
Coreopsis californica California tickseed Asteraceae
Coreopsis californica var. newberryi Newberry's tickseed Asteraceae
Coreopsis tinctoria golden tickseed Asteraceae
Coreopsis tinctoria var. atkinsoniana Atkinson's tickseed Asteraceae
Coreopsis tinctoria var. tinctoria golden tickseed Asteraceae
Coriandrum coriander Apiaceae
Coriandrum sativum coriander Apiaceae
Corispermum bugseed Chenopodiaceae
Corispermum americanum American bugseed Chenopodiaceae
Corispermum americanum var. americanum American bugseed Chenopodiaceae
Corispermum americanum var. rydbergii American bugseed Chenopodiaceae
Corispermum welshii Welsh's bugseed Chenopodiaceae
Cornus dogwood Cornaceae
Cornus sericea redosier dogwood Cornaceae
Cornus sericea ssp. sericea redosier dogwood Cornaceae
Coronopus swinecress Brassicaceae
Coronopus didymus lesser swinecress Brassicaceae
Corydalis fumewort Fumariaceae
Corydalis aurea scrambled eggs Fumariaceae
Corydalis curvisiliqua curvepod fumewort Fumariaceae
Corydalis curvisiliqua ssp. occidentalis curvepod fumewort Fumariaceae
Coryphantha beehive cactus Cactaceae
Coryphantha recurvata Santa Cruz beehive cactus Cactaceae
Coryphantha robustispina long-tubercle beehive cactus Cactaceae
Coryphantha robustispina ssp. robustispina long-tubercle beehive cactus Cactaceae
Coryphantha robustispina ssp. scheeri Scheer's beehive cactus Cactaceae
Coryphantha robustispina ssp. uncinata Scheer's beehive cactus Cactaceae
Cosmos cosmos Asteraceae
Cosmos bipinnatus garden cosmos Asteraceae
Cosmos parviflorus southwestern cosmos Asteraceae
Cottea cotta grass Poaceae
Cottea pappophoroides cotta grass Poaceae
Cotula waterbuttons Asteraceae
Cotula australis Australian waterbuttons Asteraceae
Cotula coronopifolia common brassbuttons Asteraceae
Coursetia babybonnets Fabaceae
Coursetia caribaea anil falso Fabaceae
Coursetia caribaea var. sericea anil falso Fabaceae
Coursetia glabella smooth babybonnets Fabaceae
Coursetia glandulosa rosary babybonnets Fabaceae
Crassula pygmyweed Crassulaceae
Crassula aquatica water pygmyweed Crassulaceae
Crassula connata sand pygmyweed Crassulaceae
Crassula connata var. erectoides sand pygmyweed Crassulaceae
Crassula connata var. eremica sand pygmyweed Crassulaceae
Crassula connata var. subsimplex sand pygmyweed Crassulaceae
Crassula viridis pricklyseed pygmyweed Crassulaceae
Crataegus hawthorn Rosaceae
Crataegus erythropoda cerro hawthorn Rosaceae
Crataegus rivularis river hawthorn Rosaceae
Crataegus succulenta fleshy hawthorn Rosaceae
Crepis hawksbeard Asteraceae
Crepis acuminata tapertip hawksbeard Asteraceae
Crepis acuminata ssp. acuminata tapertip hawksbeard Asteraceae
Crepis intermedia limestone hawksbeard Asteraceae
Crepis occidentalis largeflower hawksbeard Asteraceae
Crepis occidentalis ssp. costata largeflower hawksbeard Asteraceae
Crepis occidentalis ssp. occidentalis largeflower hawksbeard Asteraceae
Crepis runcinata fiddleleaf hawksbeard Asteraceae
Crepis runcinata ssp. barberi Barber's hawksbeard Asteraceae
Crepis runcinata ssp. glauca fiddleleaf hawksbeard Asteraceae
Cressa alkaliweed Convolvulaceae
Cressa truxillensis spreading alkaliweed Convolvulaceae
Crossosoma rockflower Crossosomataceae
Crossosoma bigelovii ragged rockflower Crossosomataceae
Crossosoma bigelovii var. bigelovii ragged rockflower Crossosomataceae
Crossosoma bigelovii var. glaucum ragged rockflower Crossosomataceae
Crotalaria rattlebox Fabaceae
Crotalaria pumila low rattlebox Fabaceae
Crotalaria sagittalis arrowhead rattlebox Fabaceae
Croton croton Euphorbiaceae
Croton californicus California croton Euphorbiaceae
Croton californicus var. californicus California croton Euphorbiaceae
Croton californicus var. tenuis California croton Euphorbiaceae
Croton ciliatoglandulifer Mexican croton Euphorbiaceae
Croton fruticulosus bush croton Euphorbiaceae
Croton lindheimerianus threeseed croton Euphorbiaceae
Croton lindheimerianus var. lindheimerianus threeseed croton Euphorbiaceae
Croton lindheimerianus var. tharpii Tharp's croton Euphorbiaceae
Croton monanthogynus prairie tea Euphorbiaceae
Croton pottsii leatherweed Euphorbiaceae
Croton pottsii var. pottsii leatherweed Euphorbiaceae
Croton setigerus dove weed Euphorbiaceae
Croton sonorae Sonoran croton Euphorbiaceae
Croton texensis Texas croton Euphorbiaceae
Croton texensis var. texensis Texas croton Euphorbiaceae
Croton texensis var. utahensis Utah croton Euphorbiaceae
Croton wigginsii Wiggins' croton Euphorbiaceae
Crusea mountain saucerflower Rubiaceae
Crusea diversifolia mountain saucerflower Rubiaceae
Crypsis pricklegrass Poaceae
Crypsis schoenoides swamp pricklegrass Poaceae
Cryptantha cryptantha Boraginaceae
Cryptantha abata dentnut cryptantha Boraginaceae
Cryptantha albida New Mexico cryptantha Boraginaceae
Cryptantha angustifolia Panamint cryptantha Boraginaceae
Cryptantha atwoodii Atwood's cryptantha Boraginaceae
Cryptantha bakeri Baker's cryptantha Boraginaceae
Cryptantha barbigera bearded cryptantha Boraginaceae
Cryptantha capitata capitate cryptantha Boraginaceae
Cryptantha cinerea James' cryptantha Boraginaceae
Cryptantha cinerea var. arenicola James' cryptantha Boraginaceae
Cryptantha cinerea var. cinerea James' cryptantha Boraginaceae
Cryptantha cinerea var. jamesii James' cryptantha Boraginaceae
Cryptantha cinerea var. pustulosa James' cryptantha Boraginaceae
Cryptantha circumscissa cushion cryptantha Boraginaceae
Cryptantha circumscissa var. circumscissa cushion cryptantha Boraginaceae
Cryptantha confertiflora basin yellow cryptantha Boraginaceae
Cryptantha costata ribbed cryptantha Boraginaceae
Cryptantha crassisepala thicksepal cryptantha Boraginaceae
Cryptantha crassisepala var. elachantha thicksepal cryptantha Boraginaceae
Cryptantha decipiens gravelbar cryptantha Boraginaceae
Cryptantha dumetorum bushloving cryptantha Boraginaceae
Cryptantha fendleri sanddune cryptantha Boraginaceae
Cryptantha flava Brenda's yellow cryptantha Boraginaceae
Cryptantha flavoculata roughseed cryptantha Boraginaceae
Cryptantha fulvocanescens tawny cryptantha Boraginaceae
Cryptantha fulvocanescens var. fulvocanescens tawny cryptantha Boraginaceae
Cryptantha fulvocanescens var. nitida tawny cryptantha Boraginaceae
Cryptantha ganderi Gander's cryptantha Boraginaceae
Cryptantha gracilis narrowstem cryptantha Boraginaceae
Cryptantha holoptera winged cryptantha Boraginaceae
Cryptantha humilis roundspike cryptantha Boraginaceae
Cryptantha intermedia Clearwater cryptantha Boraginaceae
Cryptantha maritima Guadalupe cryptantha Boraginaceae
Cryptantha maritima var. maritima Guadalupe cryptantha Boraginaceae
Cryptantha maritima var. pilosa Guadalupe cryptantha Boraginaceae
Cryptantha micrantha redroot cryptantha Boraginaceae
Cryptantha micrantha var. micrantha redroot cryptantha Boraginaceae
Cryptantha muricata pointed cryptantha Boraginaceae
Cryptantha nevadensis Nevada cryptantha Boraginaceae
Cryptantha nevadensis var. nevadensis Nevada cryptantha Boraginaceae
Cryptantha nevadensis var. rigida Nevada cryptantha Boraginaceae
Cryptantha osterhoutii Osterhout's cryptantha Boraginaceae
Cryptantha pterocarya wingnut cryptantha Boraginaceae
Cryptantha pterocarya var. cycloptera wingnut cryptantha Boraginaceae
Cryptantha pterocarya var. pterocarya wingnut cryptantha Boraginaceae
Cryptantha pterocarya var. stenoloba wingnut cryptantha Boraginaceae
Cryptantha pusilla low cryptantha Boraginaceae
Cryptantha racemosa bushy cryptantha Boraginaceae
Cryptantha recurvata curvenut cryptantha Boraginaceae
Cryptantha semiglabra smooth cryptantha Boraginaceae
Cryptantha setosissima bristly cryptantha Boraginaceae
Cryptantha utahensis scented cryptantha Boraginaceae
Cryptantha virginensis Virgin River cryptantha Boraginaceae
Cryptogramma rockbrake Pteridaceae
Cryptogramma acrostichoides American rockbrake Pteridaceae
Cucurbita gourd Cucurbitaceae
Cucurbita digitata fingerleaf gourd Cucurbitaceae
Cucurbita foetidissima Missouri gourd Cucurbitaceae
Cucurbita palmata coyote gourd Cucurbitaceae
Cuphea waxweed Lythraceae
Cuphea wrightii Wright's waxweed Lythraceae
Cupressus cypress Cupressaceae
Cupressus arizonica Arizona cypress Cupressaceae
Cupressus arizonica ssp. arizonica Arizona cypress Cupressaceae
Cuscuta dodder Cuscutaceae
Cuscuta applanata Gila River dodder Cuscutaceae
Cuscuta californica chaparral dodder Cuscutaceae
Cuscuta californica var. californica chaparral dodder Cuscutaceae
Cuscuta cephalanthi buttonbush dodder Cuscutaceae
Cuscuta coryli hazel dodder Cuscutaceae
Cuscuta dentatasquamata los pinitos dodder Cuscutaceae
Cuscuta denticulata desert dodder Cuscutaceae
Cuscuta denticulata var. denticulata desert dodder Cuscutaceae
Cuscuta erosa Sonoran dodder Cuscutaceae
Cuscuta gronovii scaldweed Cuscutaceae
Cuscuta gronovii var. gronovii scaldweed Cuscutaceae
Cuscuta indecora bigseed alfalfa dodder Cuscutaceae
Cuscuta indecora var. indecora bigseed alfalfa dodder Cuscutaceae
Cuscuta indecora var. neuropetala bigseed dodder Cuscutaceae
Cuscuta mitriformis Cochise dodder Cuscutaceae
Cuscuta odontolepis Santa Rita Mountain dodder Cuscutaceae
Cuscuta pentagona fiveangled dodder Cuscutaceae
Cuscuta pentagona var. pentagona fiveangled dodder Cuscutaceae
Cuscuta potosina globe dodder Cuscutaceae
Cuscuta potosina var. globifera globe dodder Cuscutaceae
Cuscuta salina saltmarsh dodder Cuscutaceae
Cuscuta salina var. papillata goldenthread Cuscutaceae
Cuscuta salina var. salina saltmarsh dodder Cuscutaceae
Cuscuta tuberculata tubercle dodder Cuscutaceae
Cuscuta umbellata flatglobe dodder Cuscutaceae
Cuscuta warneri Warner's dodder Cuscutaceae
Cyclachaena Asteraceae
Cyclachaena xanthifolia giant sumpweed Asteraceae
Cycladenia waxydogbane Apocynaceae
Cycladenia humilis Sacramento waxydogbane Apocynaceae
Cycladenia humilis var. jonesii Jones' waxydogbane Apocynaceae
Cyclanthera cyclanthera Cucurbitaceae
Cyclanthera dissecta cutleaf cyclanthera Cucurbitaceae
Cycloloma cycloloma Chenopodiaceae
Cycloloma atriplicifolium winged pigweed Chenopodiaceae
Cyclospermum marsh parsley Apiaceae
Cyclospermum leptophyllum marsh parsley Apiaceae
Cylindropuntia Cactaceae
Cylindropuntia abysii Peach Springs canyon cholla Cactaceae
Cylindropuntia acanthocarpa buck-horn cholla Cactaceae
Cylindropuntia acanthocarpa var. acanthocarpa buckhorn cholla Cactaceae
Cylindropuntia acanthocarpa var. coloradensis Colorado buckhorn cholla Cactaceae
Cylindropuntia acanthocarpa var. major buckhorn cholla Cactaceae
Cylindropuntia acanthocarpa var. thornberi Thornber's buckhorn cholla Cactaceae
Cylindropuntia arbuscula Arizona pencil cholla Cactaceae
Cylindropuntia bigelovii teddybear cholla Cactaceae
Cylindropuntia congesta Cactaceae
Cylindropuntia echinocarpa Wiggins' cholla Cactaceae
Cylindropuntia fulgida jumping cholla Cactaceae
Cylindropuntia fulgida var. fulgida jumping cholla Cactaceae
Cylindropuntia fulgida var. mamillata jumping cholla Cactaceae
Cylindropuntia imbricata tree cholla Cactaceae
Cylindropuntia imbricata var. imbricata tree cholla Cactaceae
Cylindropuntia kelvinensis Cactaceae
Cylindropuntia leptocaulis Christmas cactus Cactaceae
Cylindropuntia multigeniculata Blue Diamond cholla Cactaceae
Cylindropuntia ramosissima branched pencil cholla Cactaceae
Cylindropuntia spinosior walkingstick cactus Cactaceae
Cylindropuntia tetracantha Tucson pricklypear Cactaceae
Cylindropuntia versicolor staghorn cholla Cactaceae
Cylindropuntia vivipara Cactaceae
Cylindropuntia whipplei Whipple cholla Cactaceae
Cymopterus springparsley Apiaceae
Cymopterus acaulis plains springparsley Apiaceae
Cymopterus acaulis var. fendleri Fendler's springparsley Apiaceae
Cymopterus beckii featherleaf springparsley Apiaceae
Cymopterus bulbosus bulbous springparsley Apiaceae
Cymopterus constancei Constance's springparsley Apiaceae
Cymopterus jonesii Jones' springparsley Apiaceae
Cymopterus megacephalus largeleaf springparsley Apiaceae
Cymopterus multinervatus purplenerve springparsley Apiaceae
Cymopterus newberryi sweetroot springparsley Apiaceae
Cymopterus purpurascens widewing springparsley Apiaceae
Cymopterus purpureus purple springparsley Apiaceae
Cynanchum swallow-wort Asclepiadaceae
Cynanchum arizonicum Arizona swallow-wort Asclepiadaceae
Cynanchum ligulatum Mexican swallow-wort Asclepiadaceae
Cynanchum utahense Utah swallow-wort Asclepiadaceae
Cynanchum wigginsii Wiggins' swallow-wort Asclepiadaceae
Cynara cynara Asteraceae
Cynara scolymus globe artichoke Asteraceae
Cynodon Bermudagrass Poaceae
Cynodon dactylon Bermudagrass Poaceae
Cynoglossum hound's tongue Boraginaceae
Cynoglossum officinale gypsyflower Boraginaceae
Cyperus flatsedge Cyperaceae
Cyperus acuminatus tapertip flatsedge Cyperaceae
Cyperus aggregatus inflatedscale flatsedge Cyperaceae
Cyperus amabilis foothill flatsedge Cyperaceae
Cyperus dentoniae hairy flatsedge Cyperaceae
Cyperus difformis variable flatsedge Cyperaceae
Cyperus dipsaceus Wright's flatsedge Cyperaceae
Cyperus erythrorhizos redroot flatsedge Cyperaceae
Cyperus esculentus yellow nutsedge Cyperaceae
Cyperus esculentus var. leptostachyus yellow nutsedge Cyperaceae
Cyperus fendlerianus Fendler's flatsedge Cyperaceae
Cyperus flavicomus whiteedge flatsedge Cyperaceae
Cyperus hermaphroditus hermaphrodite flatsedge Cyperaceae
Cyperus hypopitys pine flatsedge Cyperaceae
Cyperus involucratus unbrella plant Cyperaceae
Cyperus laevigatus smooth flatsedge Cyperaceae
Cyperus manimae spectacular flatsedge Cyperaceae
Cyperus manimae var. asperrimus spectacular flatsedge Cyperaceae
Cyperus mutisii Mutis' flatsedge Cyperaceae
Cyperus niger black flatsedge Cyperaceae
Cyperus odoratus fragrant flatsedge Cyperaceae
Cyperus pallidicolor pallid flatsedge Cyperaceae
Cyperus parishii Parish's flatsedge Cyperaceae
Cyperus retroflexus oneflower flatsedge Cyperaceae
Cyperus rotundus nutgrass Cyperaceae
Cyperus schweinitzii Schweinitz's flatsedge Cyperaceae
Cyperus seslerioides Texas flatsedge Cyperaceae
Cyperus spectabilis spectacular flatsedge Cyperaceae
Cyperus sphaerolepis Rusby's flatsedge Cyperaceae
Cyperus squarrosus bearded flatsedge Cyperaceae
Cyperus strigosus strawcolored flatsedge Cyperaceae
Cyperus tetragonus fourangle flatsedge Cyperaceae
Cypripedium lady's slipper Orchidaceae
Cypripedium parviflorum lesser yellow lady's slipper Orchidaceae
Cypripedium parviflorum var. pubescens greater yellow lady's slipper Orchidaceae
Cypselea cypselea Aizoaceae
Cypselea humifusa panal Aizoaceae
Cystopteris bladderfern Dryopteridaceae
Cystopteris bulbifera bulblet bladderfern Dryopteridaceae
Cystopteris fragilis brittle bladderfern Dryopteridaceae
Cystopteris reevesiana Reeves' bladderfern Dryopteridaceae
Cystopteris tenuis upland brittle bladderfern Dryopteridaceae
Cystopteris utahensis Utah bladderfern Dryopteridaceae
D
Dactylis orchardgrass Poaceae
Dactylis glomerata orchardgrass Poaceae
Dactylis glomerata ssp. glomerata orchardgrass Poaceae
Dactyloctenium crowfoot grass Poaceae
Dactyloctenium aegyptium Egyptian grass Poaceae
Dactyloctenium radulans buttongrass Poaceae
Dactylorhiza keyflower Orchidaceae
Dactylorhiza viridis longbract frog orchid Orchidaceae
Dalea prairie clover Fabaceae
Dalea albiflora whiteflower prairie clover Fabaceae
Dalea aurea golden prairie clover Fabaceae
Dalea bicolor silver prairie clover Fabaceae
Dalea bicolor var. argyrea silver prairie clover Fabaceae
Dalea brachystachya Fort Bowie prairie clover Fabaceae
Dalea candida white prairie clover Fabaceae
Dalea candida var. oligophylla white prairie clover Fabaceae
Dalea exigua Chihuahuan prairie clover Fabaceae
Dalea exserta Mexican prairie clover Fabaceae
Dalea filiformis Sonoran prairie clover Fabaceae
Dalea flavescens Canyonlands prairie clover Fabaceae
Dalea formosa featherplume Fabaceae
Dalea grayi Gray's prairie clover Fabaceae
Dalea jamesii James' prairie clover Fabaceae
Dalea lachnostachys glandleaf prairie clover Fabaceae
Dalea lanata woolly prairie clover Fabaceae
Dalea lanata var. terminalis woolly prairie clover Fabaceae
Dalea leporina foxtail prairie clover Fabaceae
Dalea lumholtzii Lumholtz's prairie clover Fabaceae
Dalea mollis hairy prairie clover Fabaceae
Dalea mollissima soft prairie clover Fabaceae
Dalea nana dwarf prairie clover Fabaceae
Dalea nana var. carnescens dwarf prairie clover Fabaceae
Dalea nana var. nana dwarf prairie clover Fabaceae
Dalea neomexicana downy prairie clover Fabaceae
Dalea neomexicana var. neomexicana downy prairie clover Fabaceae
Dalea pogonathera bearded prairie clover Fabaceae
Dalea pogonathera var. pogonathera bearded prairie clover Fabaceae
Dalea polygonoides sixweeks prairie clover Fabaceae
Dalea pringlei Pringle's prairie clover Fabaceae
Dalea pulchra Santa Catalina prairie clover Fabaceae
Dalea purpurea purple prairie clover Fabaceae
Dalea purpurea var. purpurea purple prairie clover Fabaceae
Dalea searlsiae Searls' prairie clover Fabaceae
Dalea tentaculoides Gentry's indigobush Fabaceae
Dalea tenuifolia slimleaf prairie clover Fabaceae
Dalea urceolata pineforest prairie clover Fabaceae
Dalea versicolor oakwoods prairie clover Fabaceae
Dalea versicolor var. sessilis oakwoods prairie clover Fabaceae
Dalea versicolor var. versicolor oakwoods prairie clover Fabaceae
Dalea wrightii Wright's prairie clover Fabaceae
Danthonia oatgrass Poaceae
Danthonia californica California oatgrass Poaceae
Danthonia intermedia timber oatgrass Poaceae
Danthonia spicata poverty oatgrass Poaceae
Dasiphora shrubby cinquefoil Rosaceae
Dasiphora fruticosa shrubby cinquefoil Rosaceae
Dasiphora fruticosa ssp. floribunda shrubby cinquefoil Rosaceae
Dasylirion sotol Liliaceae
Dasylirion wheeleri common sotol Liliaceae
Dasyochloa woollygrass Poaceae
Dasyochloa pulchella low woollygrass Poaceae
Datura jimsonweed Solanaceae
Datura discolor desert thorn-apple Solanaceae
Datura inoxia pricklyburr Solanaceae
Datura quercifolia Chinese thorn-apple Solanaceae
Datura stramonium jimsonweed Solanaceae
Datura wrightii sacred thorn-apple Solanaceae
Daucus wild carrot Apiaceae
Daucus carota Queen Anne's lace Apiaceae
Daucus pusillus American wild carrot Apiaceae
Delphinium larkspur Ranunculaceae
Delphinium andesicola Chiricahua Mountain larkspur Ranunculaceae
Delphinium barbeyi subalpine larkspur Ranunculaceae
Delphinium confertiflorum Ranunculaceae
Delphinium geraniifolium Clark Valley larkspur Ranunculaceae
Delphinium glaucum Sierra larkspur Ranunculaceae
Delphinium nuttallianum twolobe larkspur Ranunculaceae
Delphinium parishii desert larkspur Ranunculaceae
Delphinium parishii ssp. parishii Parish's larkspur Ranunculaceae
Delphinium scaposum tall mountain larkspur Ranunculaceae
Delphinium scopulorum Rocky Mountain larkspur Ranunculaceae
Delphinium wootonii Organ Mountain larkspur Ranunculaceae
Deschampsia hairgrass Poaceae
Deschampsia cespitosa tufted hairgrass Poaceae
Deschampsia danthonioides annual hairgrass Poaceae
Deschampsia elongata slender hairgrass Poaceae
Descurainia tansymustard Brassicaceae
Descurainia californica Sierra tansymustard Brassicaceae
Descurainia incana mountain tansymustard Brassicaceae
Descurainia incana ssp. incisa mountain tansymustard Brassicaceae
Descurainia incana ssp. viscosa mountain tansymustard Brassicaceae
Descurainia obtusa blunt tansymustard Brassicaceae
Descurainia obtusa ssp. adenophora blunt tansymustard Brassicaceae
Descurainia obtusa ssp. obtusa blunt tansymustard Brassicaceae
Descurainia pinnata western tansymustard Brassicaceae
Descurainia pinnata ssp. filipes western tansymustard Brassicaceae
Descurainia pinnata ssp. glabra western tansymustard Brassicaceae
Descurainia pinnata ssp. halictorum western tansymustard Brassicaceae
Descurainia pinnata ssp. ochroleuca western tansymustard Brassicaceae
Descurainia pinnata ssp. paysonii Payson's tansymustard Brassicaceae
Descurainia sophia herb sophia Brassicaceae
Desmanthus bundleflower Fabaceae
Desmanthus bicornutus two-horn bundleflower Fabaceae
Desmanthus cooleyi Cooley's bundleflower Fabaceae
Desmanthus covillei Coville's bundleflower Fabaceae
Desmanthus glandulosus glandular bundleflower Fabaceae
Desmodium ticktrefoil Fabaceae
Desmodium arizonicum Arizona ticktrefoil Fabaceae
Desmodium batocaulon San Pedro ticktrefoil Fabaceae
Desmodium cinerascens spiked ticktrefoil Fabaceae
Desmodium grahamii Graham's ticktrefoil Fabaceae
Desmodium gramineum grassleaf ticktrefoil Fabaceae
Desmodium intortum greenleaf ticktrefoil Fabaceae
Desmodium metcalfei Metcalfe's ticktrefoil Fabaceae
Desmodium neomexicanum New Mexico ticktrefoil Fabaceae
Desmodium procumbens western trailing ticktrefoil Fabaceae
Desmodium procumbens var. exiguum western trailing ticktrefoil Fabaceae
Desmodium psilocarpum Santa Cruz Island ticktrefoil Fabaceae
Desmodium psilophyllum simpleleaf ticktrefoil Fabaceae
Desmodium retinens Santa Rita Mountain ticktrefoil Fabaceae
Desmodium rosei Rose's ticktrefoil Fabaceae
Desmodium scopulorum Sonoran ticktrefoil Fabaceae
Dichanthelium rosette grass Poaceae
Dichanthelium acuminatum tapered rosette grass Poaceae
Dichanthelium acuminatum var. acuminatum tapered rosette grass Poaceae
Dichanthelium acuminatum var. fasciculatum western panicgrass Poaceae
Dichanthelium oligosanthes Heller's rosette grass Poaceae
Dichanthelium oligosanthes var. scribnerianum Scribner's rosette grass Poaceae
Dichelostemma snakelily Liliaceae
Dichelostemma capitatum bluedicks Liliaceae
Dichelostemma capitatum ssp. capitatum bluedicks Liliaceae
Dichelostemma capitatum ssp. pauciflorum bluedicks Liliaceae
Dichondra ponysfoot Convolvulaceae
Dichondra argentea silver ponysfoot Convolvulaceae
Dichondra brachypoda New Mexico ponysfoot Convolvulaceae
Dichondra micrantha Asian ponysfoot Convolvulaceae
Dichondra sericea silverleaf ponysfoot Convolvulaceae
Dicliptera foldwing Acanthaceae
Dicliptera resupinata Arizona foldwing Acanthaceae
Dicoria twinbugs Asteraceae
Dicoria canescens desert twinbugs Asteraceae
Dicoria canescens ssp. brandegeei desert twinbugs Asteraceae
Dicoria canescens ssp. canescens desert twinbugs Asteraceae
Digitaria crabgrass Poaceae
Digitaria californica Arizona cottontop Poaceae
Digitaria ciliaris southern crabgrass Poaceae
Digitaria eriantha digitgrass Poaceae
Digitaria insularis sourgrass Poaceae
Digitaria ischaemum smooth crabgrass Poaceae
Digitaria pubiflora Carolina crabgrass Poaceae
Digitaria sanguinalis hairy crabgrass Poaceae
Dimorphocarpa spectaclepod Brassicaceae
Dimorphocarpa pinnatifida tansy spectaclepod Brassicaceae
Dimorphocarpa wislizeni touristplant Brassicaceae
Dimorphotheca Cape marigold Asteraceae
Dimorphotheca sinuata glandular Cape marigold Asteraceae
Diodia buttonweed Rubiaceae
Diodia teres poorjoe Rubiaceae
Diodia teres var. angustata poorjoe Rubiaceae
Diodia teres var. teres poorjoe Rubiaceae
Diphysa diphysa Fabaceae
Diphysa thurberi Thurber's diphysa Fabaceae
Diplotaxis wallrocket Brassicaceae
Diplotaxis muralis annual wallrocket Brassicaceae
Diplotaxis tenuifolia perennial wallrocket Brassicaceae
Dipsacus teasel Dipsacaceae
Dipsacus fullonum Fuller's teasel Dipsacaceae
Distichlis saltgrass Poaceae
Distichlis spicata saltgrass Poaceae
Dithyrea shieldpod Brassicaceae
Dithyrea californica California shieldpod Brassicaceae
Dodecatheon shootingstar Primulaceae
Dodecatheon alpinum alpine shootingstar Primulaceae
Dodecatheon alpinum ssp. majus alpine shootingstar Primulaceae
Dodecatheon dentatum white shootingstar Primulaceae
Dodecatheon dentatum ssp. ellisiae Ellis' shootingstar Primulaceae
Dodecatheon pulchellum darkthroat shootingstar Primulaceae
Dodecatheon pulchellum ssp. pulchellum darkthroat shootingstar Primulaceae
Dodonaea dodonaea Sapindaceae
Dodonaea viscosa Florida hopbush Sapindaceae
Draba draba Brassicaceae
Draba albertina slender draba Brassicaceae
Draba asprella rough draba Brassicaceae
Draba asprella var. asprella rough draba Brassicaceae
Draba asprella var. kaibabensis Kaibab draba Brassicaceae
Draba asprella var. stelligera rough draba Brassicaceae
Draba aurea golden draba Brassicaceae
Draba brachycarpa shortpod draba Brassicaceae
Draba crassifolia snowbed draba Brassicaceae
Draba cuneifolia wedgeleaf draba Brassicaceae
Draba cuneifolia var. cuneifolia wedgeleaf draba Brassicaceae
Draba cuneifolia var. integrifolia wedgeleaf draba Brassicaceae
Draba cuneifolia var. sonorae Sonora draba Brassicaceae
Draba helleriana Heller's draba Brassicaceae
Draba helleriana var. bifurcata Heller's draba Brassicaceae
Draba helleriana var. blumeri Blumer's draba Brassicaceae
Draba helleriana var. patens Heller's draba Brassicaceae
Draba nemorosa woodland draba Brassicaceae
Draba petrophila Santa Rita Mountain draba Brassicaceae
Draba petrophila var. petrophila Santa Rita Mountain draba Brassicaceae
Draba petrophila var. viridis Santa Rita Mountain draba Brassicaceae
Draba platycarpa broadpod draba Brassicaceae
Draba rectifructa mountain draba Brassicaceae
Draba reptans Carolina draba Brassicaceae
Draba spectabilis showy draba Brassicaceae
Draba spectabilis var. spectabilis showy draba Brassicaceae
Draba standleyi Standley's draba Brassicaceae
Dracocephalum dragonhead Lamiaceae
Dracocephalum parviflorum American dragonhead Lamiaceae
Drymaria drymary Caryophyllaceae
Drymaria effusa pinewoods drymary Caryophyllaceae
Drymaria effusa var. depressa pinewoods drymary Caryophyllaceae
Drymaria effusa var. effusa pinewoods drymary Caryophyllaceae
Drymaria glandulosa Fendler's drymary Caryophyllaceae
Drymaria leptophylla canyon drymary Caryophyllaceae
Drymaria molluginea slimleaf drymary Caryophyllaceae
Drymaria pachyphylla thickleaf drymary Caryophyllaceae
Drymaria viscosa sticky drymary Caryophyllaceae
Dryopetalon dryopetalon Brassicaceae
Dryopetalon runcinatum rockmustard Brassicaceae
Dryopteris woodfern Dryopteridaceae
Dryopteris arguta coastal woodfern Dryopteridaceae
Dryopteris cinnamomea cinnamon woodfern Dryopteridaceae
Dryopteris filix-mas male fern Dryopteridaceae
Dryopteris rossii Ross' woodfern Dryopteridaceae
Dudleya dudleya Crassulaceae
Dudleya collomiae Gila County liveforever Crassulaceae
Dudleya pulverulenta chalk dudleya Crassulaceae
Dudleya pulverulenta ssp. arizonica chalk dudleya Crassulaceae
Duranta duranta Verbenaceae
Duranta erecta golden dewdrops Verbenaceae
Dyschoriste snakeherb Acanthaceae
Dyschoriste schiedeana Schied's snakeherb Acanthaceae
Dyschoriste schiedeana var. decumbens spreading snakeherb Acanthaceae
Dyssodia dyssodia Asteraceae
Dyssodia papposa fetid marigold Asteraceae
E
Echeandia echeandia Liliaceae
Echeandia flavescens Torrey's craglily Liliaceae
Echinocactus echinocactus Cactaceae
Echinocactus horizonthalonius devilshead Cactaceae
Echinocactus horizonthalonius var. horizonthalonius devilshead Cactaceae
Echinocactus horizonthalonius var. nicholii Nichol's echinocactus Cactaceae
Echinocactus polycephalus cottontop cactus Cactaceae
Echinocactus polycephalus var. polycephalus cottontop cactus Cactaceae
Echinocactus polycephalus var. xeranthemoides cottontop cactus Cactaceae
Echinocereus hedgehog cactus Cactaceae
Echinocereus apachensis Apache hedgehog cactus Cactaceae
Echinocereus bonkerae pinkflower hedgehog cactus Cactaceae
Echinocereus boyce-thompsonii Boyce Thompson hedgehog cactus Cactaceae
Echinocereus coccineus scarlet hedgehog cactus Cactaceae
Echinocereus coccineus var. arizonicus Arizona hedgehog cactus Cactaceae
Echinocereus coccineus var. coccineus scarlet hedgehog cactus Cactaceae
Echinocereus dasyacanthus spiny hedgehog cactus Cactaceae
Echinocereus engelmannii Engelmann's hedgehog cactus Cactaceae
Echinocereus engelmannii var. acicularis Engelmann's hedgehog cactus Cactaceae
Echinocereus engelmannii var. chrysocentrus Engelmann's hedgehog cactus Cactaceae
Echinocereus engelmannii var. engelmannii Engelmann's hedgehog cactus Cactaceae
Echinocereus engelmannii var. variegatus Engelmann's hedgehog cactus Cactaceae
Echinocereus fasciculatus pinkflower hedgehog cactus Cactaceae
Echinocereus fendleri pinkflower hedgehog cactus Cactaceae
Echinocereus fendleri ssp. fendleri pinkflower hedgehog cactus Cactaceae
Echinocereus fendleri ssp. rectispinus pinkflower hedgehog cactus Cactaceae
Echinocereus ledingii Leding's hedgehog cactus Cactaceae
Echinocereus mojavensis Mojave kingcup cactus Cactaceae
Echinocereus nicholii Nichol's hedgehog cactus Cactaceae
Echinocereus pectinatus rainbow cactus Cactaceae
Echinocereus pectinatus var. pectinatus rainbow cactus Cactaceae
Echinocereus polyacanthus Mojave mound cactus Cactaceae
Echinocereus rigidissimus rainbow hedgehog cactus Cactaceae
Echinocereus triglochidiatus kingcup cactus Cactaceae
Echinocereus triglochidiatus var. triglochidiatus kingcup cactus Cactaceae
Echinochloa cockspur grass Poaceae
Echinochloa colona jungle rice Poaceae
Echinochloa crus-galli barnyardgrass Poaceae
Echinochloa crus-pavonis gulf cockspur grass Poaceae
Echinochloa crus-pavonis var. macera gulf cockspur grass Poaceae
Echinochloa muricata rough barnyardgrass Poaceae
Echinochloa muricata var. microstachya rough barnyardgrass Poaceae
Echinochloa oplismenoides Chihuahuan cockspur Poaceae
Echinocystis echinocystis Cucurbitaceae
Echinocystis lobata wild cucumber Cucurbitaceae
Echinodorus burhead Alismataceae
Echinodorus berteroi upright burhead Alismataceae
Echinomastus Cactaceae
Echinomastus erectocentrus redspine fishhook cactus Cactaceae
Echinomastus intertextus white fishhook cactus Cactaceae
Echinomastus johnsonii Johnson's fishhook cactus Cactaceae
Echinopepon balsam apple Cucurbitaceae
Echinopepon wrightii wild balsam apple Cucurbitaceae
Eclipta eclipta Asteraceae
Eclipta prostrata false daisy Asteraceae
Egeria egeria Hydrocharitaceae
Egeria densa Brazilian waterweed Hydrocharitaceae
Eichhornia water hyacinth Pontederiaceae
Eichhornia crassipes common water hyacinth Pontederiaceae
Elaeagnus oleaster Elaeagnaceae
Elaeagnus angustifolia Russian olive Elaeagnaceae
Elatine waterwort Elatinaceae
Elatine brachysperma shortseed waterwort Elatinaceae
Elatine californica California waterwort Elatinaceae
Elatine chilensis Chilean waterwort Elatinaceae
Elatine rubella southwestern waterwort Elatinaceae
Eleocharis spikerush Cyperaceae
Eleocharis acicularis needle spikerush Cyperaceae
Eleocharis acicularis var. acicularis needle spikerush Cyperaceae
Eleocharis acicularis var. porcata Cyperaceae
Eleocharis bella beautiful spikerush Cyperaceae
Eleocharis bolanderi Bolander's spikerush Cyperaceae
Eleocharis cancellata Arizona spikerush Cyperaceae
Eleocharis engelmannii Engelmann's spikerush Cyperaceae
Eleocharis flavescens yellow spikerush Cyperaceae
Eleocharis flavescens var. thermalis yellow spikerush Cyperaceae
Eleocharis geniculata Canada spikesedge Cyperaceae
Eleocharis macrostachya pale spikerush Cyperaceae
Eleocharis montana mountain spikerush Cyperaceae
Eleocharis montevidensis sand spikerush Cyperaceae
Eleocharis palustris common spikerush Cyperaceae
Eleocharis palustris var. palustris common spikerush Cyperaceae
Eleocharis parishii Parish's spikerush Cyperaceae
Eleocharis parvula dwarf spikerush Cyperaceae
Eleocharis quinqueflora fewflower spikerush Cyperaceae
Eleocharis radicans rooted spikerush Cyperaceae
Eleocharis rostellata beaked spikerush Cyperaceae
Eleusine goosegrass Poaceae
Eleusine indica Indian goosegrass Poaceae
Elionurus balsamscale grass Poaceae
Elionurus barbiculmis woolyspike balsamscale Poaceae
Elodea waterweed Hydrocharitaceae
Elodea bifoliata twoleaf waterweed Hydrocharitaceae
Elodea canadensis Canadian waterweed Hydrocharitaceae
Elymus wildrye Poaceae
Elymus arizonicus Arizona wheatgrass Poaceae
Elymus canadensis Canada wildrye Poaceae
Elymus elymoides squirreltail Poaceae
Elymus elymoides ssp. brevifolius squirreltail Poaceae
Elymus elymoides ssp. elymoides squirreltail Poaceae
Elymus glaucus blue wildrye Poaceae
Elymus glaucus ssp. glaucus blue wildrye Poaceae
Elymus interruptus Texas wildrye Poaceae
Elymus lanceolatus thickspike wheatgrass Poaceae
Elymus lanceolatus ssp. lanceolatus thickspike wheatgrass Poaceae
Elymus multisetus big squirreltail Poaceae
Elymus pinaloensis Poaceae
Elymus pseudorepens Poaceae
Elymus repens quackgrass Poaceae
Elymus saundersii Poaceae
Elymus scribneri spreading wheatgrass Poaceae
Elymus trachycaulus slender wheatgrass Poaceae
Elymus trachycaulus ssp. subsecundus slender wheatgrass Poaceae
Elymus trachycaulus ssp. trachycaulus slender wheatgrass Poaceae
Elymus virginicus Virginia wildrye Poaceae
Elymus virginicus var. virginicus Virginia wildrye Poaceae
Elytraria scalystem Acanthaceae
Elytraria imbricata purple scalystem Acanthaceae
Emmenanthe whisperingbells Hydrophyllaceae
Emmenanthe penduliflora whisperingbells Hydrophyllaceae
Emmenanthe penduliflora var. penduliflora whisperingbells Hydrophyllaceae
Encelia brittlebush Asteraceae
Encelia farinosa brittlebush Asteraceae
Encelia frutescens button brittlebush Asteraceae
Encelia resinifera sticky brittlebush Asteraceae
Encelia resinifera ssp. resinifera button brittlebush Asteraceae
Encelia resinifera ssp. tenuifolia Asteraceae
Encelia virginensis Virgin River brittlebush Asteraceae
Enceliopsis sunray Asteraceae
Enceliopsis argophylla silverleaf sunray Asteraceae
Enceliopsis nudicaulis nakedstem sunray Asteraceae
Enceliopsis nudicaulis var. nudicaulis nakedstem sunray Asteraceae
Engelmannia Engelmann's daisy Asteraceae
Engelmannia peristenia Engelmann's daisy Asteraceae
Enneapogon feather pappusgrass Poaceae
Enneapogon cenchroides soft feather pappusgrass Poaceae
Enneapogon desvauxii nineawn pappusgrass Poaceae
Enteropogon unbrellagrass Poaceae
Enteropogon chlorideus buryseed umbrellagrass Poaceae
Ephedra jointfir Ephedraceae
Ephedra arenicola Ephedraceae
Ephedra aspera rough jointfir Ephedraceae
Ephedra californica California jointfir Ephedraceae
Ephedra cutleri Cutler's jointfir Ephedraceae
Ephedra fasciculata Arizona jointfir Ephedraceae
Ephedra funerea Death Valley jointfir Ephedraceae
Ephedra nevadensis Nevada jointfir Ephedraceae
Ephedra torreyana Torrey's jointfir Ephedraceae
Ephedra torreyana var. torreyana Torrey's jointfir Ephedraceae
Ephedra trifurca longleaf jointfir Ephedraceae
Ephedra viridis mormon tea Ephedraceae
Epilobium willowherb Onagraceae
Epilobium brachycarpum tall annual willowherb Onagraceae
Epilobium canum hummingbird trumpet Onagraceae
Epilobium canum ssp. garrettii Garrett's firechalice Onagraceae
Epilobium canum ssp. latifolium hummingbird trumpet Onagraceae
Epilobium ciliatum fringed willowherb Onagraceae
Epilobium ciliatum ssp. ciliatum fringed willowherb Onagraceae
Epilobium ciliatum ssp. glandulosum fringed willowherb Onagraceae
Epilobium densiflorum denseflower willowherb Onagraceae
Epilobium foliosum leafy willowherb Onagraceae
Epilobium halleanum glandular willowherb Onagraceae
Epilobium hornemannii Hornemann's willowherb Onagraceae
Epilobium hornemannii ssp. hornemannii Hornemann's willowherb Onagraceae
Epilobium lactiflorum milkflower willowherb Onagraceae
Epilobium minutum chaparral willowherb Onagraceae
Epilobium oregonense Oregon willowherb Onagraceae
Epilobium pygmaeum smooth spike-primrose Onagraceae
Epilobium saximontanum Rocky Mountain willowherb Onagraceae
Epipactis helleborine Orchidaceae
Epipactis gigantea stream orchid Orchidaceae
Epithelantha pingpong-ball cactus Cactaceae
Epithelantha micromeris pingpong-ball cactus Cactaceae
Epixiphium epixiphium Scrophulariaceae
Epixiphium wislizeni balloonbush Scrophulariaceae
Equisetum horsetail Equisetaceae
Equisetum arvense field horsetail Equisetaceae
Equisetum ferrissii Equisetaceae
Equisetum hyemale scouringrush horsetail Equisetaceae
Equisetum hyemale var. affine scouringrush horsetail Equisetaceae
Equisetum laevigatum smooth horsetail Equisetaceae
Eragrostis lovegrass Poaceae
Eragrostis barrelieri Mediterranean lovegrass Poaceae
Eragrostis cilianensis stinkgrass Poaceae
Eragrostis curvula weeping lovegrass Poaceae
Eragrostis echinochloidea African lovegrass Poaceae
Eragrostis intermedia plains lovegrass Poaceae
Eragrostis lehmanniana Lehmann lovegrass Poaceae
Eragrostis lutescens sixweeks lovegrass Poaceae
Eragrostis mexicana Mexican lovegrass Poaceae
Eragrostis mexicana ssp. mexicana Mexican lovegrass Poaceae
Eragrostis mexicana ssp. virescens Mexican lovegrass Poaceae
Eragrostis obtusiflora alkali lovegrass Poaceae
Eragrostis pectinacea tufted lovegrass Poaceae
Eragrostis pectinacea var. miserrima desert lovegrass Poaceae
Eragrostis pectinacea var. pectinacea tufted lovegrass Poaceae
Eragrostis pilosa Indian lovegrass Poaceae
Eragrostis spectabilis purple lovegrass Poaceae
Eragrostis superba Wilman lovegrass Poaceae
Eremalche mallow Malvaceae
Eremalche exilis white mallow Malvaceae
Eremalche rotundifolia desert fivespot Malvaceae
Eremocrinum eremocrinum Liliaceae
Eremocrinum albomarginatum lonely lily Liliaceae
Eremopyrum false wheatgrass Poaceae
Eremopyrum triticeum annual wheatgrass Poaceae
Eriastrum woollystar Polemoniaceae
Eriastrum diffusum miniature woollystar Polemoniaceae
Eriastrum eremicum desert woollystar Polemoniaceae
Eriastrum eremicum ssp. eremicum desert woollystar Polemoniaceae
Eriastrum eremicum ssp. yageri Yager's woollystar Polemoniaceae
Ericameria goldenbush Asteraceae
Ericameria cervina deer goldenbush Asteraceae
Ericameria cuneata cliff goldenbush Asteraceae
Ericameria cuneata var. spathulata cliff goldenbush Asteraceae
Ericameria laricifolia turpentine bush Asteraceae
Ericameria linearifolia narrowleaf goldenbush Asteraceae
Ericameria nauseosa rubber rabbitbrush Asteraceae
Ericameria nauseosa ssp. consimilis rubber rabbitbrush Asteraceae
Ericameria nauseosa ssp. consimilis var. arenaria rubber rabbitbrush Asteraceae
Ericameria nauseosa ssp. consimilis var. juncea rubber rabbitbrush Asteraceae
Ericameria nauseosa ssp. consimilis var. leiosperma rubber rabbitbrush Asteraceae
Ericameria nauseosa ssp. consimilis var. nitida rubber rabbitbrush Asteraceae
Ericameria nauseosa ssp. consimilis var. oreophila rubber rabbitbrush Asteraceae
Ericameria nauseosa ssp. consimilis var. turbinata rubber rabbitbrush Asteraceae
Ericameria nauseosa ssp. nauseosa rubber rabbitbrush Asteraceae
Ericameria nauseosa ssp. nauseosa var. bigelovii rubber rabbitbrush Asteraceae
Ericameria nauseosa ssp. nauseosa var. glabrata rubber rabbitbrush Asteraceae
Ericameria nauseosa ssp. nauseosa var. hololeuca rubber rabbitbrush Asteraceae
Ericameria nauseosa ssp. nauseosa var. latisquamea rubber rabbitbrush Asteraceae
Ericameria paniculata Mojave rabbitbrush Asteraceae
Ericameria parryi Parry's rabbitbrush Asteraceae
Ericameria parryi var. attenuata Parry's rabbitbrush Asteraceae
Ericameria parryi var. howardii Parry's rabbitbrush Asteraceae
Ericameria parryi var. nevadensis Parry's rabbitbrush Asteraceae
Ericameria teretifolia green rabbitbrush Asteraceae
Ericameria watsonii Watson's goldenbush Asteraceae
Erigeron fleabane Asteraceae
Erigeron anchana Sierra Ancha fleabane Asteraceae
Erigeron aphanactis rayless shaggy fleabane Asteraceae
Erigeron aphanactis var. aphanactis rayless shaggy fleabane Asteraceae
Erigeron arisolius arid throne fleabane Asteraceae
Erigeron arizonicus Arizona fleabane Asteraceae
Erigeron bellidiastrum western daisy fleabane Asteraceae
Erigeron bellidiastrum var. bellidiastrum western daisy fleabane Asteraceae
Erigeron caespitosus tufted fleabane Asteraceae
Erigeron canus hoary fleabane Asteraceae
Erigeron colomexicanus running fleabane Asteraceae
Erigeron compactus cushion daisy Asteraceae
Erigeron compositus cutleaf daisy Asteraceae
Erigeron concinnus Navajo fleabane Asteraceae
Erigeron concinnus var. concinnus Navajo fleabane Asteraceae
Erigeron concinnus var. condensatus Navajo fleabane Asteraceae
Erigeron concinnus var. subglaber Navajo fleabane Asteraceae
Erigeron consimilis foothill fleabane Asteraceae
Erigeron divergens spreading fleabane Asteraceae
Erigeron eatonii Eaton's fleabane Asteraceae
Erigeron eatonii var. eatonii Eaton's fleabane Asteraceae
Erigeron eximius sprucefir fleabane Asteraceae
Erigeron flagellaris trailing fleabane Asteraceae
Erigeron formosissimus beautiful fleabane Asteraceae
Erigeron heliographis Heliograph Peak fleabane Asteraceae
Erigeron kuschei Chiricahua fleabane Asteraceae
Erigeron lemmonii Lemmon's fleabane Asteraceae
Erigeron lobatus lobed fleabane Asteraceae
Erigeron lonchophyllus shortray fleabane Asteraceae
Erigeron modestus plains fleabane Asteraceae
Erigeron neomexicanus New Mexico fleabane Asteraceae
Erigeron oreophilus chaparral fleabane Asteraceae
Erigeron oxyphyllus wand fleabane Asteraceae
Erigeron piscaticus Fish Creek fleabane Asteraceae
Erigeron pringlei Pringle's fleabane Asteraceae
Erigeron pumilus shaggy fleabane Asteraceae
Erigeron pumilus ssp. pumilus shaggy fleabane Asteraceae
Erigeron rhizomatus rhizome fleabane Asteraceae
Erigeron saxatilis rock fleabane Asteraceae
Erigeron sceptrifer scepterbearing fleabane Asteraceae
Erigeron scopulinus Winn Falls fleabane Asteraceae
Erigeron simplex onestem fleabane Asteraceae
Erigeron sivinskii Sivinsk's erigeron Asteraceae
Erigeron speciosus aspen fleabane Asteraceae
Erigeron speciosus var. macranthus aspen fleabane Asteraceae
Erigeron tener slender fleabane Asteraceae
Erigeron ursinus Bear River fleabane Asteraceae
Erigeron utahensis Utah fleabane Asteraceae
Erigeron utahensis var. sparsifolius Utah fleabane Asteraceae
Erigeron utahensis var. utahensis Utah fleabane Asteraceae
Erigeron velutipes Chihuahuan fleabane Asteraceae
Erigeron versicolor changing fleabane Asteraceae
Erigeron vreelandii Vreeland's erigeron Asteraceae
Eriochloa cupgrass Poaceae
Eriochloa acuminata tapertip cupgrass Poaceae
Eriochloa acuminata var. acuminata tapertip cupgrass Poaceae
Eriochloa acuminata var. minor tapertip cupgrass Poaceae
Eriochloa aristata bearded cupgrass Poaceae
Eriochloa contracta prairie cupgrass Poaceae
Eriochloa fatmensis tropical cupgrass Poaceae
Eriochloa lemmonii canyon cupgrass Poaceae
Eriodictyon yerba santa Hydrophyllaceae
Eriodictyon angustifolium narrowleaf yerba santa Hydrophyllaceae
Eriogonum buckwheat Polygonaceae
Eriogonum abertianum Abert's buckwheat Polygonaceae
Eriogonum alatum winged buckwheat Polygonaceae
Eriogonum alatum var. alatum winged buckwheat Polygonaceae
Eriogonum alatum var. mogollense winged buckwheat Polygonaceae
Eriogonum arizonicum Arizona buckwheat Polygonaceae
Eriogonum brachypodum Parry's buckwheat Polygonaceae
Eriogonum caespitosum matted buckwheat Polygonaceae
Eriogonum capillare San Carlos buckwheat Polygonaceae
Eriogonum cernuum nodding buckwheat Polygonaceae
Eriogonum cernuum var. cernuum nodding buckwheat Polygonaceae
Eriogonum corymbosum crispleaf buckwheat Polygonaceae
Eriogonum corymbosum var. corymbosum crispleaf buckwheat Polygonaceae
Eriogonum corymbosum var. glutinosum crispleaf buckwheat Polygonaceae
Eriogonum corymbosum var. orbiculatum crispleaf buckwheat Polygonaceae
Eriogonum corymbosum var. velutinum crispleaf buckwheat Polygonaceae
Eriogonum darrovii Darrow's buckwheat Polygonaceae
Eriogonum davidsonii Davidson's buckwheat Polygonaceae
Eriogonum deflexum flatcrown buckwheat Polygonaceae
Eriogonum deflexum var. deflexum flatcrown buckwheat Polygonaceae
Eriogonum deserticola Colorado Desert buckwheat Polygonaceae
Eriogonum divaricatum divergent buckwheat Polygonaceae
Eriogonum ericifolium Yavapai County buckwheat Polygonaceae
Eriogonum ericifolium var. ericifolium Yavapai County buckwheat Polygonaceae
Eriogonum fasciculatum Eastern Mojave buckwheat Polygonaceae
Eriogonum fasciculatum var. foliolosum Eastern Mojave buckwheat Polygonaceae
Eriogonum fasciculatum var. polifolium Eastern Mojave buckwheat Polygonaceae
Eriogonum gordonii Gordon's buckwheat Polygonaceae
Eriogonum heermannii Heermann's buckwheat Polygonaceae
Eriogonum heermannii var. apachense Apache buckwheat Polygonaceae
Eriogonum heermannii var. argense Heermann's buckwheat Polygonaceae
Eriogonum heermannii var. floccosum Clark Mountain buckwheat Polygonaceae
Eriogonum heermannii var. subracemosum Heermann's buckwheat Polygonaceae
Eriogonum heermannii var. subspinosum Heermann's buckwheat Polygonaceae
Eriogonum heermannii var. sulcatum Heermann's buckwheat Polygonaceae
Eriogonum hieraciifolium hawkweed buckwheat Polygonaceae
Eriogonum hookeri Hooker's buckwheat Polygonaceae
Eriogonum inflatum desert trumpet Polygonaceae
Eriogonum inflatum var. deflatum desert trumpet Polygonaceae
Eriogonum inflatum var. inflatum desert trumpet Polygonaceae
Eriogonum insigne ladder buckwheat Polygonaceae
Eriogonum jamesii James' buckwheat Polygonaceae
Eriogonum jamesii var. flavescens James' buckwheat Polygonaceae
Eriogonum jamesii var. jamesii James' buckwheat Polygonaceae
Eriogonum jamesii var. undulatum James' buckwheat Polygonaceae
Eriogonum jonesii Jones' buckwheat Polygonaceae
Eriogonum lachnogynum woollycup buckwheat Polygonaceae
Eriogonum leptocladon sand buckwheat Polygonaceae
Eriogonum leptocladon var. leptocladon sand buckwheat Polygonaceae
Eriogonum leptocladon var. papiliunculi sand buckwheat Polygonaceae
Eriogonum leptocladon var. ramosissimum sand buckwheat Polygonaceae
Eriogonum leptophyllum slenderleaf buckwheat Polygonaceae
Eriogonum maculatum spotted buckwheat Polygonaceae
Eriogonum microthecum slender buckwheat Polygonaceae
Eriogonum microthecum var. laxiflorum slender buckwheat Polygonaceae
Eriogonum microthecum var. simpsonii Simpson's buckwheat Polygonaceae
Eriogonum mortonianum Fredonia buckwheat Polygonaceae
Eriogonum nidularium birdnest buckwheat Polygonaceae
Eriogonum nummulare money buckwheat Polygonaceae
Eriogonum ovalifolium cushion buckwheat Polygonaceae
Eriogonum ovalifolium var. purpureum cushion buckwheat Polygonaceae
Eriogonum palmerianum Palmer's buckwheat Polygonaceae
Eriogonum parishii mountainmist Polygonaceae
Eriogonum pharnaceoides wirestem buckwheat Polygonaceae
Eriogonum pharnaceoides var. cervinum wirestem buckwheat Polygonaceae
Eriogonum pharnaceoides var. pharnaceoides wirestem buckwheat Polygonaceae
Eriogonum plumatella yucca buckwheat Polygonaceae
Eriogonum polycladon sorrel buckwheat Polygonaceae
Eriogonum pulchrum Yavapai County buckwheat Polygonaceae
Eriogonum pusillum yellowturbans Polygonaceae
Eriogonum racemosum redroot buckwheat Polygonaceae
Eriogonum reniforme kidneyleaf buckwheat Polygonaceae
Eriogonum ripleyi Fraziers Well buckwheat Polygonaceae
Eriogonum rotundifolium roundleaf buckwheat Polygonaceae
Eriogonum shockleyi Shockley's buckwheat Polygonaceae
Eriogonum subreniforme kidneyshape buckwheat Polygonaceae
Eriogonum thomasii Thomas' buckwheat Polygonaceae
Eriogonum thompsoniae Thompson's buckwheat Polygonaceae
Eriogonum thompsoniae var. albiflorum Thompson's buckwheat Polygonaceae
Eriogonum thompsoniae var. atwoodii Atwood's buckwheat Polygonaceae
Eriogonum thompsoniae var. thompsoniae Thompson's buckwheat Polygonaceae
Eriogonum thurberi Thurber's buckwheat Polygonaceae
Eriogonum trichopes little deserttrumpet Polygonaceae
Eriogonum trichopes var. trichopes little deserttrumpet Polygonaceae
Eriogonum umbellatum sulphur-flower buckwheat Polygonaceae
Eriogonum umbellatum var. cognatum sulphur-flower buckwheat Polygonaceae
Eriogonum umbellatum var. nevadense sulphur-flower buckwheat Polygonaceae
Eriogonum umbellatum var. subaridum sulphur-flower buckwheat Polygonaceae
Eriogonum viridulum clay hill buckwheat Polygonaceae
Eriogonum wetherillii Wetherill's buckwheat Polygonaceae
Eriogonum wrightii bastardsage Polygonaceae
Eriogonum wrightii var. nodosum bastardsage Polygonaceae
Eriogonum wrightii var. pringlei Pringle's bastardsage Polygonaceae
Eriogonum wrightii var. wrightii bastardsage Polygonaceae
Eriogonum zionis Zion buckwheat Polygonaceae
Eriogonum zionis var. coccineum Zion buckwheat Polygonaceae
Eriogonum zionis var. zionis Zion buckwheat Polygonaceae
Erioneuron woollygrass Poaceae
Erioneuron avenaceum shortleaf woollygrass Poaceae
Erioneuron pilosum hairy woollygrass Poaceae
Eriophyllum woolly sunflower Asteraceae
Eriophyllum confertiflorum golden-yarrow Asteraceae
Eriophyllum confertiflorum var. confertiflorum golden-yarrow Asteraceae
Eriophyllum multicaule manystem woolly sunflower Asteraceae
Eriophyllum pringlei Pringle's woolly sunflower Asteraceae
Erodium stork's bill Geraniaceae
Erodium cicutarium redstem stork's bill Geraniaceae
Erodium cicutarium ssp. cicutarium redstem stork's bill Geraniaceae
Erodium moschatum musky stork's bill Geraniaceae
Erodium moschatum var. moschatum musky stork's bill Geraniaceae
Erodium texanum Texas stork's bill Geraniaceae
Errazurizia dunebroom Fabaceae
Errazurizia rotundata roundleaf dunebroom Fabaceae
Eruca rocketsalad Brassicaceae
Eruca vesicaria rocketsalad Brassicaceae
Eruca vesicaria ssp. sativa rocketsalad Brassicaceae
Eryngium eryngo Apiaceae
Eryngium heterophyllum Wright's eryngo Apiaceae
Eryngium lemmonii Chiricahua Mountain eryngo Apiaceae
Eryngium nasturtiifolium hierba del sapo Apiaceae
Eryngium phyteumae Huachuca Mountain eryngo Apiaceae
Eryngium sparganophyllum Arizona eryngo Apiaceae
Erysimum wallflower Brassicaceae
Erysimum capitatum sanddune wallflower Brassicaceae
Erysimum capitatum var. capitatum sanddune wallflower Brassicaceae
Erysimum capitatum var. purshii Pursh's wallflower Brassicaceae
Erysimum cheiranthoides wormseed wallflower Brassicaceae
Erysimum inconspicuum shy wallflower Brassicaceae
Erysimum inconspicuum var. inconspicuum shy wallflower Brassicaceae
Erysimum repandum spreading wallflower Brassicaceae
Erythrina erythrina Fabaceae
Erythrina flabelliformis coralbean Fabaceae
Eschscholzia California poppy Papaveraceae
Eschscholzia californica California poppy Papaveraceae
Eschscholzia californica ssp. californica California poppy Papaveraceae
Eschscholzia californica ssp. mexicana California poppy Papaveraceae
Eschscholzia glyptosperma desert poppy Papaveraceae
Eschscholzia minutiflora pygmy poppy Papaveraceae
Eschscholzia minutiflora ssp. minutiflora pygmy poppy Papaveraceae
Escobaria foxtail cactus Cactaceae
Escobaria alversonii cushion foxtail cactus Cactaceae
Escobaria missouriensis Missouri foxtail cactus Cactaceae
Escobaria orcuttii Orcutt's foxtail cactus Cactaceae
Escobaria orcuttii var. orcuttii Orcutt's foxtail cactus Cactaceae
Escobaria robbinsiorum Cochise foxtail cactus Cactaceae
Escobaria tuberculosa whitecolumn foxtail cactus Cactaceae
Escobaria vivipara spinystar Cactaceae
Escobaria vivipara var. arizonica Arizona spinystar Cactaceae
Escobaria vivipara var. bisbeeana Bisbee spinystar Cactaceae
Escobaria vivipara var. buoflama spinystar Cactaceae
Escobaria vivipara var. deserti desert spinystar Cactaceae
Escobaria vivipara var. kaibabensis Kaibab spinystar Cactaceae
Escobaria vivipara var. rosea spinystar Cactaceae
Escobaria vivipara var. vivipara spinystar Cactaceae
Eucnide stingbush Loasaceae
Eucnide rupestris rock nettle Loasaceae
Eucnide urens desert stingbush Loasaceae
Eucrypta hideseed Hydrophyllaceae
Eucrypta chrysanthemifolia spotted hideseed Hydrophyllaceae
Eucrypta chrysanthemifolia var. bipinnatifida spotted hideseed Hydrophyllaceae
Eucrypta micrantha dainty desert hideseed Hydrophyllaceae
Eupatoriadelphus Asteraceae
Eupatoriadelphus maculatus spotted trumpetweed Asteraceae
Eupatoriadelphus maculatus var. bruneri spotted joe pye weed Asteraceae
Euphorbia spurge Euphorbiaceae
Euphorbia aaron-rossii Marble Canyon spurge Euphorbiaceae
Euphorbia bilobata blackseed spurge Euphorbiaceae
Euphorbia brachycera horned spurge Euphorbiaceae
Euphorbia chamaesula mountain spurge Euphorbiaceae
Euphorbia crenulata Chinese caps Euphorbiaceae
Euphorbia cuphosperma hairy-fruit spurge Euphorbiaceae
Euphorbia cyathophora fire on the mountain Euphorbiaceae
Euphorbia davidii David's spurge Euphorbiaceae
Euphorbia dentata toothed spurge Euphorbiaceae
Euphorbia dentata var. dentata toothed spurge Euphorbiaceae
Euphorbia eriantha beetle spurge Euphorbiaceae
Euphorbia esula leafy spurge Euphorbiaceae
Euphorbia esula var. esula leafy spurge Euphorbiaceae
Euphorbia exstipulata squareseed spurge Euphorbiaceae
Euphorbia heterophylla Mexican fireplant Euphorbiaceae
Euphorbia lathyris moleplant Euphorbiaceae
Euphorbia macropus Huachuca Mountain spurge Euphorbiaceae
Euphorbia marginata snow on the mountain Euphorbiaceae
Euphorbia palmeri woodland spurge Euphorbiaceae
Euphorbia palmeri var. palmeri woodland spurge Euphorbiaceae
Euphorbia palmeri var. subpubens woodland spurge Euphorbiaceae
Euphorbia peplus petty spurge Euphorbiaceae
Euphorbia radians sun spurge Euphorbiaceae
Euphorbia schizoloba Mojave spurge Euphorbiaceae
Euphorbia spathulata warty spurge Euphorbiaceae
Eurybia aster Asteraceae
Eurybia glauca gray aster Asteraceae
Eurybia pulchra beautiful aster Asteraceae
Euryops euryops Asteraceae
Euryops multifidus hawk's eye Asteraceae
Eustoma prairie gentian Gentianaceae
Eustoma exaltatum catchfly prairie gentian Gentianaceae
Eustoma exaltatum ssp. exaltatum catchfly prairie gentian Gentianaceae
Euthamia goldentop Asteraceae
Euthamia occidentalis western goldentop Asteraceae
Evax pygmy cudweed Asteraceae
Evax verna spring pygmycudweed Asteraceae
Evax verna var. verna spring pygmycudweed Asteraceae
Evolvulus dwarf morning-glory Convolvulaceae
Evolvulus alsinoides slender dwarf morning-glory Convolvulaceae
Evolvulus alsinoides var. angustifolius slender dwarf morning-glory Convolvulaceae
Evolvulus arizonicus wild dwarf morning-glory Convolvulaceae
Evolvulus nuttallianus shaggy dwarf morning-glory Convolvulaceae
Evolvulus sericeus silver dwarf morning-glory Convolvulaceae
Evolvulus sericeus var. sericeus silver dwarf morning-glory Convolvulaceae
Eysenhardtia kidneywood Fabaceae
Eysenhardtia orthocarpa Tahitian kidneywood Fabaceae
F
Fagonia fagonbush Zygophyllaceae
Fagonia laevis California fagonbush Zygophyllaceae
Fagonia pachyacantha sticky fagonbush Zygophyllaceae
Fagopyrum buckwheat Polygonaceae
Fagopyrum esculentum buckwheat Polygonaceae
Fallugia Apache plume Rosaceae
Fallugia paradoxa Apache plume Rosaceae
Fendlera fendlerbush Hydrangeaceae
Fendlera rupicola cliff fendlerbush Hydrangeaceae
Fendlera wrightii Wright's fendlerbush Hydrangeaceae
Fendlerella fendlerbush Hydrangeaceae
Fendlerella utahensis Utah fendlerbush Hydrangeaceae
Fendlerella utahensis var. cymosa Utah fendlerbush Hydrangeaceae
Fendlerella utahensis var. utahensis Utah fendlerbush Hydrangeaceae
Ferocactus barrel cactus Cactaceae
Ferocactus cylindraceus California barrel cactus Cactaceae
Ferocactus cylindraceus var. cylindraceus California barrel cactus Cactaceae
Ferocactus cylindraceus var. lecontei Leconte's barrel cactus Cactaceae
Ferocactus eastwoodiae California barrel cactus Cactaceae
Ferocactus emoryi Emory's barrel cactus Cactaceae
Ferocactus wislizeni candy barrelcactus Cactaceae
Festuca fescue Poaceae
Festuca arizonica Arizona fescue Poaceae
Festuca brachyphylla alpine fescue Poaceae
Festuca brachyphylla ssp. coloradensis Colorado fescue Poaceae
Festuca calligera southwest fescue Poaceae
Festuca earlei Earle's fescue Poaceae
Festuca idahoensis Idaho fescue Poaceae
Festuca idahoensis ssp. idahoensis Idaho fescue Poaceae
Festuca minutiflora smallflower fescue Poaceae
Festuca rubra red fescue Poaceae
Festuca rubra ssp. rubra red fescue Poaceae
Festuca saximontana Rocky Mountain fescue Poaceae
Festuca saximontana var. saximontana Rocky Mountain fescue Poaceae
Festuca sororia ravine fescue Poaceae
Festuca thurberi Thurber's fescue Poaceae
Festuca valesiaca Volga fescue Poaceae
Fimbristylis fimbry Cyperaceae
Fimbristylis annua annual fimbry Cyperaceae
Fimbristylis thermalis hot springs fimbry Cyperaceae
Fimbristylis vahlii Vahl's fimbry Cyperaceae
Fingerhuthia Zulu fescue Poaceae
Fingerhuthia africana Zulu fescue Poaceae
Flaveria yellowtops Asteraceae
Flaveria campestris alkali yellowtops Asteraceae
Flaveria macdougalii Mcdougall's yellowtops Asteraceae
Flaveria trinervia clustered yellowtops Asteraceae
Fleischmannia thoroughwort Asteraceae
Fleischmannia incarnata pink thoroughwort Asteraceae
Fleischmannia pycnocephala lavender thoroughwort Asteraceae
Fleischmannia sonorae Sonoran thoroughwort Asteraceae
Flourensia tarwort Asteraceae
Flourensia cernua American tarwort Asteraceae
Foeniculum fennel Apiaceae
Foeniculum vulgare sweet fennel Apiaceae
Forestiera swampprivet Oleaceae
Forestiera pubescens stretchberry Oleaceae
Forestiera pubescens var. pubescens stretchberry Oleaceae
Forestiera shrevei desert olive Oleaceae
Fouquieria ocotillo Fouquieriaceae
Fouquieria splendens ocotillo Fouquieriaceae
Fragaria strawberry Rosaceae
Fragaria vesca woodland strawberry Rosaceae
Fragaria vesca ssp. bracteata woodland strawberry Rosaceae
Fragaria virginiana Virginia strawberry Rosaceae
Fragaria virginiana ssp. glauca Virginia strawberry Rosaceae
Fragaria virginiana ssp. platypetala Virginia strawberry Rosaceae
Frangula buckthorn Rhamnaceae
Frangula betulifolia beechleaf frangula Rhamnaceae
Frangula betulifolia ssp. betulifolia beechleaf frangula Rhamnaceae
Frangula betulifolia ssp. obovata obovate buckthorn Rhamnaceae
Frangula blumeri Rhamnaceae
Frangula californica California buckthorn Rhamnaceae
Frangula californica ssp. ursina California buckthorn Rhamnaceae
Frasera green gentian Gentianaceae
Frasera albomarginata desert frasera Gentianaceae
Frasera paniculata tufted frasera Gentianaceae
Frasera parryi Coahuila frasera Gentianaceae
Frasera speciosa elkweed Gentianaceae
Fraxinus ash Oleaceae
Fraxinus anomala singleleaf ash Oleaceae
Fraxinus anomala var. anomala singleleaf ash Oleaceae
Fraxinus anomala var. lowellii singleleaf ash Oleaceae
Fraxinus cuspidata fragrant ash Oleaceae
Fraxinus dipetala California ash Oleaceae
Fraxinus gooddingii Goodding's ash Oleaceae
Fraxinus greggii Gregg's ash Oleaceae
Fraxinus papillosa Chihuahuan ash Oleaceae
Fraxinus velutina velvet ash Oleaceae
Fremontodendron flannelbush Sterculiaceae
Fremontodendron californicum California flannelbush Sterculiaceae
Fritillaria fritillary Liliaceae
Fritillaria atropurpurea spotted fritillary Liliaceae
Froelichia snakecotton Amaranthaceae
Froelichia arizonica Arizona snakecotton Amaranthaceae
Froelichia gracilis slender snakecotton Amaranthaceae
Froelichia interrupta Texas snakecotton Amaranthaceae
Fuirena umbrella-sedge Cyperaceae
Fuirena simplex western umbrella-sedge Cyperaceae
Fuirena simplex var. simplex western umbrella-sedge Cyperaceae
Fumaria fumitory Fumariaceae
Fumaria occidentalis western fumitory Fumariaceae
Fumaria parviflora fineleaf fumitory Fumariaceae
Funastrum twinevine Asclepiadaceae
Funastrum crispum wavyleaf twinevine Asclepiadaceae
Funastrum cynanchoides fringed twinevine Asclepiadaceae
Funastrum cynanchoides ssp. cynanchoides fringed twinevine Asclepiadaceae
Funastrum cynanchoides ssp. heterophyllum Hartweg's twinevine Asclepiadaceae
Funastrum hirtellum hairy milkweed Asclepiadaceae
G
Gaillardia blanketflower Asteraceae
Gaillardia aristata common gaillardia Asteraceae
Gaillardia arizonica Arizona blanketflower Asteraceae
Gaillardia multiceps onion blanketflower Asteraceae
Gaillardia multiceps var. multiceps onion blanketflower Asteraceae
Gaillardia parryi Parry's blanketflower Asteraceae
Gaillardia pinnatifida red dome blanketflower Asteraceae
Gaillardia pinnatifida var. linearis red dome blanketflower Asteraceae
Gaillardia pinnatifida var. pinnatifida red dome blanketflower Asteraceae
Gaillardia pulchella firewheel Asteraceae
Gaillardia pulchella var. pulchella firewheel Asteraceae
Galactia milkpea Fabaceae
Galactia wrightii Wright's milkpea Fabaceae
Galactia wrightii var. mollissima Wright's milkpea Fabaceae
Galactia wrightii var. wrightii Wright's milkpea Fabaceae
Galinsoga gallant soldier Asteraceae
Galinsoga parviflora gallant soldier Asteraceae
Galium bedstraw Rubiaceae
Galium aparine stickywilly Rubiaceae
Galium bifolium twinleaf bedstraw Rubiaceae
Galium boreale northern bedstraw Rubiaceae
Galium collomiae Fossil Hill Creek bedstraw Rubiaceae
Galium coloradoense Colorado bedstraw Rubiaceae
Galium fendleri Fendler's bedstraw Rubiaceae
Galium mexicanum Mexican bedstraw Rubiaceae
Galium mexicanum ssp. asperrimum Mexican bedstraw Rubiaceae
Galium microphyllum bracted bedstraw Rubiaceae
Galium munzii Munz's bedstraw Rubiaceae
Galium munzii ssp. ambivalens Munz's bedstraw Rubiaceae
Galium munzii ssp. munzii Munz's bedstraw Rubiaceae
Galium proliferum limestone bedstraw Rubiaceae
Galium stellatum starry bedstraw Rubiaceae
Galium stellatum ssp. eremicum starry bedstraw Rubiaceae
Galium trifidum threepetal bedstraw Rubiaceae
Galium trifidum ssp. subbiflorum threepetal bedstraw Rubiaceae
Galium triflorum fragrant bedstraw Rubiaceae
Galium uncinulatum bristly bedstraw Rubiaceae
Galium wrightii Wright's bedstraw Rubiaceae
Gamochaeta everlasting Asteraceae
Gamochaeta falcata narrowleaf purple everlasting Asteraceae
Gamochaeta purpurea spoonleaf purple everlasting Asteraceae
Garrya silktassel Garryaceae
Garrya flavescens ashy silktassel Garryaceae
Garrya wrightii Wright's silktassel Garryaceae
Gastridium nit grass Poaceae
Gastridium phleoides nit grass Poaceae
Gaura beeblossom Onagraceae
Gaura coccinea scarlet beeblossom Onagraceae
Gaura hexandra harlequinbush Onagraceae
Gaura hexandra ssp. gracilis harlequinbush Onagraceae
Gaura mollis velvetweed Onagraceae
Gayophytum groundsmoke Onagraceae
Gayophytum decipiens deceptive groundsmoke Onagraceae
Gayophytum diffusum spreading groundsmoke Onagraceae
Gayophytum diffusum ssp. parviflorum spreading groundsmoke Onagraceae
Gayophytum racemosum blackfoot groundsmoke Onagraceae
Gayophytum ramosissimum pinyon groundsmoke Onagraceae
Gentiana gentian Gentianaceae
Gentiana affinis pleated gentian Gentianaceae
Gentiana fremontii moss gentian Gentianaceae
Gentianella dwarf gentian Gentianaceae
Gentianella amarella autumn dwarf gentian Gentianaceae
Gentianella amarella ssp. acuta autumn dwarf gentian Gentianaceae
Gentianella amarella ssp. heterosepala autumn dwarf gentian Gentianaceae
Gentianella microcalyx Chiricahua dwarf gentian Gentianaceae
Gentianella tenella Dane's dwarf gentian Gentianaceae
Gentianella tenella ssp. tenella Dane's dwarf gentian Gentianaceae
Gentianella wislizeni Chiricahua Mountain dwarf gentian Gentianaceae
Gentianella wrightii Wright's dwarf gentian Gentianaceae
Gentianopsis fringed gentian Gentianaceae
Gentianopsis barbellata perennial fringed gentian Gentianaceae
Gentianopsis macrantha grand fringed gentian Gentianaceae
Geraea desertsunflower Asteraceae
Geraea canescens hairy desertsunflower Asteraceae
Geranium geranium Geraniaceae
Geranium atropurpureum western purple cranesbill Geraniaceae
Geranium atropurpureum var. atropurpureum western purple cranesbill Geraniaceae
Geranium caespitosum pineywoods geranium Geraniaceae
Geranium caespitosum var. caespitosum pineywoods geranium Geraniaceae
Geranium caespitosum var. eremophilum purple cluster geranium Geraniaceae
Geranium caespitosum var. fremontii Fremont's geranium Geraniaceae
Geranium caespitosum var. parryi Parry's geranium Geraniaceae
Geranium carolinianum Carolina geranium Geraniaceae
Geranium carolinianum var. carolinianum Carolina geranium Geraniaceae
Geranium lentum Mogollon geranium Geraniaceae
Geranium richardsonii Richardson's geranium Geraniaceae
Geranium wislizeni Huachuca Mountain geranium Geraniaceae
Geum avens Rosaceae
Geum aleppicum yellow avens Rosaceae
Geum macrophyllum largeleaf avens Rosaceae
Geum macrophyllum var. perincisum largeleaf avens Rosaceae
Geum rossii Ross' avens Rosaceae
Geum rossii var. turbinatum Ross' avens Rosaceae
Geum triflorum old man's whiskers Rosaceae
Geum triflorum var. ciliatum old man's whiskers Rosaceae
Gilia gilia Polemoniaceae
Gilia achilleifolia California gilia Polemoniaceae
Gilia achilleifolia ssp. multicaulis California gilia Polemoniaceae
Gilia capitata bluehead gilia Polemoniaceae
Gilia capitata ssp. staminea bluehead gilia Polemoniaceae
Gilia clivorum purplespot gilia Polemoniaceae
Gilia clokeyi Clokey's gilia Polemoniaceae
Gilia flavocincta lesser yellowthroat gilia Polemoniaceae
Gilia flavocincta ssp. australis lesser yellowthroat gilia Polemoniaceae
Gilia flavocincta ssp. flavocincta lesser yellowthroat gilia Polemoniaceae
Gilia mexicana El Paso gilia Polemoniaceae
Gilia minor little gilia Polemoniaceae
Gilia ophthalmoides eyed gilia Polemoniaceae
Gilia scopulorum rock gilia Polemoniaceae
Gilia sinuata rosy gilia Polemoniaceae
Gilia stellata star gilia Polemoniaceae
Gilia transmontana transmontane gilia Polemoniaceae
Giliastrum Polemoniaceae
Giliastrum acerosum bluebowls Polemoniaceae
Glandularia mock vervain Verbenaceae
Glandularia bipinnatifida Dakota mock vervain Verbenaceae
Glandularia bipinnatifida var. bipinnatifida Dakota mock vervain Verbenaceae
Glandularia bipinnatifida var. ciliata Davis Mountain mock vervain Verbenaceae
Glandularia chiricahensis Chiricahua Mountain mock vervain Verbenaceae
Glandularia elegans mountain mock vervain Verbenaceae
Glandularia elegans var. asperata mountain mock vervain Verbenaceae
Glandularia elegans var. elegans mountain mock vervain Verbenaceae
Glandularia gooddingii southwestern mock vervain Verbenaceae
Glandularia hybrida Verbenaceae
Glandularia pulchella South American mock vervain Verbenaceae
Glebionis Asteraceae
Glebionis coronarium crowndaisy Asteraceae
Gleditsia locust Fabaceae
Gleditsia triacanthos honeylocust Fabaceae
Glinus sweetjuice Molluginaceae
Glinus lotoides lotus sweetjuice Molluginaceae
Glinus radiatus spreading sweetjuice Molluginaceae
Glossopetalon greasebush Crossosomataceae
Glossopetalon spinescens spiny greasebush Crossosomataceae
Glossopetalon spinescens var. aridum spiny greasebush Crossosomataceae
Glossopetalon spinescens var. meionandrum spiny greasebush Crossosomataceae
Glossopetalon spinescens var. microphyllum spiny greasebush Crossosomataceae
Glossopetalon spinescens var. spinescens spiny greasebush Crossosomataceae
Glyceria mannagrass Poaceae
Glyceria borealis small floating mannagrass Poaceae
Glyceria grandis American mannagrass Poaceae
Glyceria grandis var. grandis American mannagrass Poaceae
Glyceria striata fowl mannagrass Poaceae
Glycyrrhiza licorice Fabaceae
Glycyrrhiza lepidota American licorice Fabaceae
Glyptopleura glyptopleura Asteraceae
Glyptopleura marginata carveseed Asteraceae
Glyptopleura setulosa holy dandelion Asteraceae
Gnaphalium cudweed Asteraceae
Gnaphalium exilifolium slender cudweed Asteraceae
Gnaphalium palustre western marsh cudweed Asteraceae
Gomphrena globe amaranth Amaranthaceae
Gomphrena caespitosa tufted globe amaranth Amaranthaceae
Gomphrena nitida pearly globe amaranth Amaranthaceae
Gomphrena sonorae Sonoran globe amaranth Amaranthaceae
Goodyera rattlesnake plantain Orchidaceae
Goodyera oblongifolia western rattlesnake plantain Orchidaceae
Goodyera repens lesser rattlesnake plantain Orchidaceae
Gossypium cotton Malvaceae
Gossypium thurberi Thurber's cotton Malvaceae
Graptopetalum leatherpetal Crassulaceae
Graptopetalum bartramii Patagonia Mountain leatherpetal Crassulaceae
Graptopetalum rusbyi San Francisco River leatherpetal Crassulaceae
Gratiola hedgehyssop Scrophulariaceae
Gratiola neglecta clammy hedgehyssop Scrophulariaceae
Grayia hopsage Chenopodiaceae
Grayia spinosa spiny hopsage Chenopodiaceae
Grindelia gumweed Asteraceae
Grindelia arizonica Arizona gumweed Asteraceae
Grindelia arizonica var. arizonica Arizona gumweed Asteraceae
Grindelia laciniata cutleaf gumweed Asteraceae
Grindelia nuda curlytop gumweed Asteraceae
Grindelia nuda var. aphanactis curlytop gumweed Asteraceae
Grindelia oxylepis Mexican gumweed Asteraceae
Grindelia papposa Spanish gold Asteraceae
Grindelia squarrosa curlycup gumweed Asteraceae
Grindelia squarrosa var. serrulata curlycup gumweed Asteraceae
Grindelia squarrosa var. squarrosa curlycup gumweed Asteraceae
Grusonia Cactaceae
Grusonia clavata club cholla Cactaceae
Grusonia emoryi devil cholla Cactaceae
Grusonia kunzei devil's cholla Cactaceae
Grusonia parishii matted cholla Cactaceae
Guardiola guardiola Asteraceae
Guardiola platyphylla Apache plant Asteraceae
Guilleminea matweed Amaranthaceae
Guilleminea densa small matweed Amaranthaceae
Guilleminea densa var. aggregata small matweed Amaranthaceae
Guilleminea densa var. densa small matweed Amaranthaceae
Guillenia mustard Brassicaceae
Guillenia lasiophylla California mustard Brassicaceae
Gutierrezia snakeweed Asteraceae
Gutierrezia arizonica Arizona snakeweed Asteraceae
Gutierrezia microcephala threadleaf snakeweed Asteraceae
Gutierrezia sarothrae broom snakeweed Asteraceae
Gutierrezia serotina late snakeweed Asteraceae
Gutierrezia sphaerocephala roundleaf snakeweed Asteraceae
Gutierrezia wrightii Wright's snakeweed Asteraceae
Gymnocarpium oakfern Dryopteridaceae
Gymnocarpium dryopteris western oakfern Dryopteridaceae
Gymnosperma gymnosperma Asteraceae
Gymnosperma glutinosum gumhead Asteraceae
H
Hackelia stickseed Boraginaceae
Hackelia besseyi Bessey's stickseed Boraginaceae
Hackelia floribunda manyflower stickseed Boraginaceae
Hackelia pinetorum Livermore stickseed Boraginaceae
Hackelia pinetorum var. pinetorum Livermore stickseed Boraginaceae
Hackelia ursina Chihuahuan stickseed Boraginaceae
Hackelia ursina var. diaboli Chihuahuan stickseed Boraginaceae
Hackelia ursina var. pustulata Chihuahuan stickseed Boraginaceae
Hackelia ursina var. ursina Chihuahuan stickseed Boraginaceae
Hackelochloa pitscale grass Poaceae
Hackelochloa granularis pitscale grass Poaceae
Halenia spurred gentian Gentianaceae
Halenia recurva Mt. Graham spurred gentian Gentianaceae
Halimolobos fissurewort Brassicaceae
Halimolobos diffusa spreading fissurewort Brassicaceae
Halogeton saltlover Chenopodiaceae
Halogeton glomeratus saltlover Chenopodiaceae
Haplophyton haplophyton Apocynaceae
Haplophyton crooksii cockroachplant Apocynaceae
Harpagonella grapplinghook Boraginaceae
Harpagonella palmeri Palmer's grapplinghook Boraginaceae
Harpagonella palmeri var. arizonica Arizona grapplinghook Boraginaceae
Harpagonella palmeri var. palmeri Palmer's grapplinghook Boraginaceae
Hedeoma false pennyroyal Lamiaceae
Hedeoma costata ribbed false pennyroyal Lamiaceae
Hedeoma costata var. pulchella ribbed false pennyroyal Lamiaceae
Hedeoma dentata dentate false pennyroyal Lamiaceae
Hedeoma diffusa spreading false pennyroyal Lamiaceae
Hedeoma drummondii Drummond's false pennyroyal Lamiaceae
Hedeoma hyssopifolia aromatic false pennyroyal Lamiaceae
Hedeoma nana dwarf false pennyroyal Lamiaceae
Hedeoma nana ssp. californica California false pennyroyal Lamiaceae
Hedeoma nana ssp. macrocalyx dwarf false pennyroyal Lamiaceae
Hedeoma nana ssp. nana dwarf false pennyroyal Lamiaceae
Hedeoma oblongifolia oblongleaf false pennyroyal Lamiaceae
Hedera ivy Araliaceae
Hedera colchica colchis ivy Araliaceae
Hedera helix English ivy Araliaceae
Hedosyne Asteraceae
Hedosyne ambrosiifolia ragged marsh-elder Asteraceae
Hedyotis starviolet Rubiaceae
Hedyotis greenei Greene's starviolet Rubiaceae
Hedyotis vegrandis New Mexico starviolet Rubiaceae
Hedypnois hedypnois Asteraceae
Hedypnois cretica Cretanweed Asteraceae
Hedysarum sweetvetch Fabaceae
Hedysarum boreale Utah sweetvetch Fabaceae
Hedysarum boreale ssp. boreale Utah sweetvetch Fabaceae
Hedysarum boreale ssp. boreale var. boreale Utah sweetvetch Fabaceae
Helenium sneezeweed Asteraceae
Helenium arizonicum Arizona sneezeweed Asteraceae
Helenium autumnale common sneezeweed Asteraceae
Helenium autumnale var. autumnale common sneezeweed Asteraceae
Helenium autumnale var. montanum mountain sneezeweed Asteraceae
Helenium bigelovii Bigelow's sneezeweed Asteraceae
Helenium thurberi Thurber's sneezeweed Asteraceae
Helianthella helianthella Asteraceae
Helianthella microcephala purpledisk helianthella Asteraceae
Helianthella parryi Parry's dwarf-sunflower Asteraceae
Helianthella quinquenervis fivenerve helianthella Asteraceae
Helianthus sunflower Asteraceae
Helianthus annuus common sunflower Asteraceae
Helianthus anomalus western sunflower Asteraceae
Helianthus arizonensis Arizona sunflower Asteraceae
Helianthus ciliaris Texas blueweed Asteraceae
Helianthus niveus showy sunflower Asteraceae
Helianthus niveus ssp. canescens showy sunflower Asteraceae
Helianthus niveus ssp. tephrodes Algodones sunflower Asteraceae
Helianthus nuttallii Nuttall's sunflower Asteraceae
Helianthus nuttallii ssp. nuttallii Nuttall's sunflower Asteraceae
Helianthus pauciflorus stiff sunflower Asteraceae
Helianthus pauciflorus ssp. subrhomboideus stiff sunflower Asteraceae
Helianthus petiolaris prairie sunflower Asteraceae
Helianthus petiolaris ssp. fallax prairie sunflower Asteraceae
Helianthus petiolaris ssp. petiolaris prairie sunflower Asteraceae
Heliomeris false goldeneye Asteraceae
Heliomeris hispida rough false goldeneye Asteraceae
Heliomeris longifolia longleaf false goldeneye Asteraceae
Heliomeris longifolia var. annua longleaf false goldeneye Asteraceae
Heliomeris longifolia var. longifolia longleaf false goldeneye Asteraceae
Heliomeris multiflora showy goldeneye Asteraceae
Heliomeris multiflora var. brevifolia showy goldeneye Asteraceae
Heliomeris multiflora var. macrocephala Asteraceae
Heliomeris multiflora var. multiflora showy goldeneye Asteraceae
Heliomeris multiflora var. nevadensis Nevada goldeneye Asteraceae
Heliopsis heliopsis Asteraceae
Heliopsis parvifolia mountain oxeye Asteraceae
Heliotropium heliotrope Boraginaceae
Heliotropium convolvulaceum phlox heliotrope Boraginaceae
Heliotropium convolvulaceum var. californicum phlox heliotrope Boraginaceae
Heliotropium convolvulaceum var. convolvulaceum phlox heliotrope Boraginaceae
Heliotropium curassavicum salt heliotrope Boraginaceae
Heliotropium curassavicum var. curassavicum salt heliotrope Boraginaceae
Heliotropium curassavicum var. oculatum seaside heliotrope Boraginaceae
Heliotropium fruticosum Key West heliotrope Boraginaceae
Heliotropium pringlei Pringle's heliotrope Boraginaceae
Heliotropium procumbens fourspike heliotrope Boraginaceae
Heliotropium procumbens var. procumbens fourspike heliotrope Boraginaceae
Hemizonia tarweed Asteraceae
Hemizonia kelloggii Kellogg's tarweed Asteraceae
Henrya henrya Acanthaceae
Henrya insularis island renegade Acanthaceae
Heracleum cowparsnip Apiaceae
Heracleum maximum common cowparsnip Apiaceae
Herissantia herissantia Malvaceae
Herissantia crispa bladdermallow Malvaceae
Hermannia hermannia Sterculiaceae
Hermannia pauciflora Santa Catalina burstwort Sterculiaceae
Herniaria rupturewort Caryophyllaceae
Herniaria hirsuta hairy rupturewort Caryophyllaceae
Herniaria hirsuta ssp. cinerea hairy rupturewort Caryophyllaceae
Hesperocallis desert lily Liliaceae
Hesperocallis undulata desert lily Liliaceae
Hesperochiron hesperochiron Hydrophyllaceae
Hesperochiron pumilus dwarf hesperochiron Hydrophyllaceae
Hesperodoria glowweed Asteraceae
Hesperodoria salicina willow glowweed Asteraceae
Hesperodoria scopulorum Grand Canyon glowweed Asteraceae
Hesperostipa needle and thread Poaceae
Hesperostipa comata needle and thread Poaceae
Hesperostipa comata ssp. comata needle and thread Poaceae
Hesperostipa comata ssp. intermedia intermediate needle and thread Poaceae
Hesperostipa neomexicana New Mexico feathergrass Poaceae
Hesperoyucca Agavaceae
Hesperoyucca newberryi Newberry's yucca Agavaceae
Hesperoyucca whipplei chaparral yucca Agavaceae
Heteranthera mudplantain Pontederiaceae
Heteranthera dubia grassleaf mudplantain Pontederiaceae
Heteranthera limosa blue mudplantain Pontederiaceae
Heteranthera peduncularis egret mudplantain Pontederiaceae
Heteranthera rotundifolia roundleaf mudplantain Pontederiaceae
Heteropogon tanglehead Poaceae
Heteropogon contortus tanglehead Poaceae
Heteropogon melanocarpus sweet tanglehead Poaceae
Heterosperma heterosperma Asteraceae
Heterosperma pinnatum wingpetal Asteraceae
Heterotheca false goldenaster Asteraceae
Heterotheca fulcrata rockyscree false goldenaster Asteraceae
Heterotheca fulcrata var. amplifolia rockyscree false goldenaster Asteraceae
Heterotheca fulcrata var. arizonica Arizona false goldenaster Asteraceae
Heterotheca fulcrata var. fulcrata rockyscree false goldenaster Asteraceae
Heterotheca fulcrata var. senilis rockyscree false goldenaster Asteraceae
Heterotheca grandiflora telegraphweed Asteraceae
Heterotheca marginata Sonora false goldenaster Asteraceae
Heterotheca rutteri Rutter's false goldenaster Asteraceae
Heterotheca subaxillaris camphorweed Asteraceae
Heterotheca villosa hairy false goldenaster Asteraceae
Heterotheca villosa var. minor hairy false goldenaster Asteraceae
Heterotheca villosa var. nana hairy false goldenaster Asteraceae
Heterotheca villosa var. pedunculata hairy false goldenaster Asteraceae
Heterotheca villosa var. scabra hairy false goldenaster Asteraceae
Heterotheca viscida cliff false goldenaster Asteraceae
Heterotheca zionensis Zion false goldenaster Asteraceae
Heuchera alumroot Saxifragaceae
Heuchera eastwoodiae Senator Mine alumroot Saxifragaceae
Heuchera glomerulata Chiricahua Mountain alumroot Saxifragaceae
Heuchera novomexicana New Mexico alumroot Saxifragaceae
Heuchera parvifolia littleleaf alumroot Saxifragaceae
Heuchera parvifolia var. arizonica Arizona alumroot Saxifragaceae
Heuchera parvifolia var. flavescens littleleaf alumroot Saxifragaceae
Heuchera rubescens pink alumroot Saxifragaceae
Heuchera rubescens var. rubescens pink alumroot Saxifragaceae
Heuchera rubescens var. versicolor pink alumroot Saxifragaceae
Heuchera sanguinea coralbells Saxifragaceae
Heuchera sanguinea var. pulchra coralbells Saxifragaceae
Heuchera sanguinea var. sanguinea coralbells Saxifragaceae
Hexalectris crested coralroot Orchidaceae
Hexalectris revoluta Chisos Mountain crested coralroot Orchidaceae
Hexalectris spicata spiked crested coralroot Orchidaceae
Hexalectris spicata var. arizonica spiked crested coralroot Orchidaceae
Hexalectris spicata var. spicata spiked crested coralroot Orchidaceae
Hexalectris warnockii Texas crested coralroot Orchidaceae
Hibiscus rosemallow Malvaceae
Hibiscus biseptus Arizona rosemallow Malvaceae
Hibiscus coulteri desert rosemallow Malvaceae
Hibiscus denudatus paleface Malvaceae
Hibiscus trionum flower of an hour Malvaceae
Hieracium hawkweed Asteraceae
Hieracium carneum Huachuca hawkweed Asteraceae
Hieracium fendleri yellow hawkweed Asteraceae
Hieracium fendleri var. discolor yellow hawkweed Asteraceae
Hieracium fendleri var. fendleri yellow hawkweed Asteraceae
Hieracium fendleri var. mogollense Mogollon hawkweed Asteraceae
Hieracium lemmonii Lemmon's hawkweed Asteraceae
Hieracium pringlei Pringle's hawkweed Asteraceae
Hieracium rusbyi Rusby's hawkweed Asteraceae
Hierochloe sweetgrass Poaceae
Hierochloe hirta northern sweetgrass Poaceae
Hierochloe hirta ssp. arctica northern sweetgrass Poaceae
Hilaria curly-mesquite Poaceae
Hilaria belangeri curly-mesquite Poaceae
Hilaria belangeri var. belangeri curly-mesquite Poaceae
Hilaria belangeri var. longifolia longleaf curly-mesquite Poaceae
Hippuris mare's-tail Hippuridaceae
Hippuris vulgaris common mare's-tail Hippuridaceae
Hoffmannseggia rushpea Fabaceae
Hoffmannseggia drepanocarpa sicklepod holdback Fabaceae
Hoffmannseggia glauca Indian rushpea Fabaceae
Hoffmannseggia microphylla wand holdback Fabaceae
Holcus velvetgrass Poaceae
Holcus lanatus common velvetgrass Poaceae
Holodiscus oceanspray Rosaceae
Holodiscus discolor oceanspray Rosaceae
Holodiscus dumosus rockspirea Rosaceae
Hordeum barley Poaceae
Hordeum arizonicum Arizona barley Poaceae
Hordeum brachyantherum meadow barley Poaceae
Hordeum brachyantherum ssp. brachyantherum meadow barley Poaceae
Hordeum jubatum foxtail barley Poaceae
Hordeum jubatum ssp. jubatum foxtail barley Poaceae
Hordeum marinum seaside barley Poaceae
Hordeum marinum ssp. gussonianum Mediterranean barley Poaceae
Hordeum murinum mouse barley Poaceae
Hordeum murinum ssp. glaucum smooth barley Poaceae
Hordeum murinum ssp. leporinum hare barley Poaceae
Hordeum murinum ssp. murinum wall barley Poaceae
Hordeum pusillum little barley Poaceae
Hordeum vulgare common barley Poaceae
Hornungia Brassicaceae
Hornungia procumbens prostrate hutchinsia Brassicaceae
Horsfordia velvetmallow Malvaceae
Horsfordia alata pink velvetmallow Malvaceae
Horsfordia newberryi Newberry's velvetmallow Malvaceae
Houstonia bluet Rubiaceae
Houstonia pusilla tiny bluet Rubiaceae
Houstonia rubra red bluet Rubiaceae
Houstonia wrightii pygmy bluet Rubiaceae
Hulsea alpinegold Asteraceae
Hulsea heterochroma redray alpinegold Asteraceae
Humulus hop Cannabaceae
Humulus lupulus common hop Cannabaceae
Humulus lupulus var. neomexicanus common hop Cannabaceae
Hybanthus greenviolet Violaceae
Hybanthus attenuatus western greenviolet Violaceae
Hybanthus verticillatus babyslippers Violaceae
Hydrilla hydrilla Hydrocharitaceae
Hydrilla verticillata waterthyme Hydrocharitaceae
Hydrocotyle hydrocotyle Apiaceae
Hydrocotyle prolifera whorled marshpennywort Apiaceae
Hydrocotyle ranunculoides floating marshpennywort Apiaceae
Hydrocotyle verticillata whorled marshpennywort Apiaceae
Hydrocotyle verticillata var. verticillata whorled marshpennywort Apiaceae
Hydrophyllum waterleaf Hydrophyllaceae
Hydrophyllum occidentale western waterleaf Hydrophyllaceae
Hymenoclea burrobrush Asteraceae
Hymenoclea monogyra singlewhorl burrobrush Asteraceae
Hymenoclea salsola burrobrush Asteraceae
Hymenoclea salsola var. fasciculata burrobrush Asteraceae
Hymenoclea salsola var. pentalepis burrobrush Asteraceae
Hymenoclea salsola var. salsola burrobrush Asteraceae
Hymenopappus hymenopappus Asteraceae
Hymenopappus filifolius fineleaf hymenopappus Asteraceae
Hymenopappus filifolius var. cinereus fineleaf hymenopappus Asteraceae
Hymenopappus filifolius var. lugens fineleaf hymenopappus Asteraceae
Hymenopappus filifolius var. megacephalus fineleaf hymenopappus Asteraceae
Hymenopappus filifolius var. nanus fineleaf hymenopappus Asteraceae
Hymenopappus filifolius var. pauciflorus fineleaf hymenopappus Asteraceae
Hymenopappus filifolius var. tomentosus finehair hymenopappus Asteraceae
Hymenopappus flavescens collegeflower Asteraceae
Hymenopappus flavescens var. canotomentosus collegeflower Asteraceae
Hymenopappus mexicanus Mexican woollywhite Asteraceae
Hymenopappus radiatus ray hymenopappus Asteraceae
Hymenothrix thimblehead Asteraceae
Hymenothrix loomisii Loomis' thimblehead Asteraceae
Hymenothrix wislizeni Trans-Pecos thimblehead Asteraceae
Hymenothrix wrightii Wright's thimblehead Asteraceae
Hymenoxys rubberweed Asteraceae
Hymenoxys ambigens Pinaleno Mountain rubberweed Asteraceae
Hymenoxys ambigens var. ambigens Pinaleno Mountain rubberweed Asteraceae
Hymenoxys ambigens var. floribunda Apache Passe rubberweed Asteraceae
Hymenoxys bigelovii Bigelow's rubberweed Asteraceae
Hymenoxys cooperi Cooper's rubberweed Asteraceae
Hymenoxys cooperi var. canescens Cooper's rubberweed Asteraceae
Hymenoxys cooperi var. cooperi Cooper's rubberweed Asteraceae
Hymenoxys helenioides Intermountain rubberweed Asteraceae
Hymenoxys hoopesii owl's-claws Asteraceae
Hymenoxys jamesii Jame's rubberweed Asteraceae
Hymenoxys lemmonii Lemmon's rubberweed Asteraceae
Hymenoxys odorata bitter rubberweed Asteraceae
Hymenoxys quinquesquamata rincon rubberweed Asteraceae
Hymenoxys richardsonii pingue rubberweed Asteraceae
Hymenoxys richardsonii var. floribunda Colorado rubberweed Asteraceae
Hymenoxys rusbyi Rusby's rubberweed Asteraceae
Hymenoxys subintegra Arizona rubberweed Asteraceae
Hypericum St. Johnswort Clusiaceae
Hypericum anagalloides tinker's penny Clusiaceae
Hypericum scouleri Scouler's St. Johnswort Clusiaceae
Hypericum scouleri ssp. scouleri Scouler's St. Johnswort Clusiaceae
Hypoxis star-grass Liliaceae
Hypoxis mexicana Mexican yellow star-grass Liliaceae
Hyptis bushmint Lamiaceae
Hyptis emoryi desert lavender Lamiaceae
I
Ibervillea globeberry Cucurbitaceae
Ibervillea tenuisecta slimlobe globeberry Cucurbitaceae
Iliamna wild hollyhock Malvaceae
Iliamna grandiflora largeflower wild hollyhock Malvaceae
Imperata satintail Poaceae
Imperata brevifolia California satintail Poaceae
Indigofera indigo Fabaceae
Indigofera sphaerocarpa Sonoran indigo Fabaceae
Ipomoea morning-glory Convolvulaceae
Ipomoea barbatisepala canyon morning-glory Convolvulaceae
Ipomoea capillacea purple morning-glory Convolvulaceae
Ipomoea cardiophylla heartleaf morning-glory Convolvulaceae
Ipomoea costellata crestrib morning-glory Convolvulaceae
Ipomoea cristulata Trans-Pecos morning-glory Convolvulaceae
Ipomoea hederacea ivyleaf morning-glory Convolvulaceae
Ipomoea leucantha Convolvulaceae
Ipomoea longifolia pinkthroat morning-glory Convolvulaceae
Ipomoea plummerae Huachuca Mountain morning-glory Convolvulaceae
Ipomoea pubescens silky morning-glory Convolvulaceae
Ipomoea purpurea tall morning-glory Convolvulaceae
Ipomoea tenuiloba spiderleaf Convolvulaceae
Ipomoea tenuiloba var. lemmonii spiderleaf Convolvulaceae
Ipomoea ternifolia tripleleaf morning-glory Convolvulaceae
Ipomoea ternifolia var. leptotoma tripleleaf morning-glory Convolvulaceae
Ipomoea thurberi Thurber's morning-glory Convolvulaceae
Ipomoea tricolor grannyvine Convolvulaceae
Ipomopsis ipomopsis Polemoniaceae
Ipomopsis aggregata scarlet gilia Polemoniaceae
Ipomopsis aggregata ssp. formosissima scarlet gilia Polemoniaceae
Ipomopsis arizonica Arizona ipomopsis Polemoniaceae
Ipomopsis congesta ballhead ipomopsis Polemoniaceae
Ipomopsis congesta ssp. frutescens ballhead ipomopsis Polemoniaceae
Ipomopsis gunnisonii sanddune ipomopsis Polemoniaceae
Ipomopsis laxiflora iron ipomopsis Polemoniaceae
Ipomopsis longiflora flaxflowered ipomopsis Polemoniaceae
Ipomopsis longiflora ssp. australis whiteflower ipomopsis Polemoniaceae
Ipomopsis longiflora ssp. longiflora flaxflowered ipomopsis Polemoniaceae
Ipomopsis macombii Macomb's ipomopsis Polemoniaceae
Ipomopsis macrosiphon longtube ipomopsis Polemoniaceae
Ipomopsis multiflora manyflowered ipomopsis Polemoniaceae
Ipomopsis polycladon manybranched ipomopsis Polemoniaceae
Ipomopsis pumila dwarf ipomopsis Polemoniaceae
Ipomopsis tenuifolia slenderleaf skyrocket Polemoniaceae
Ipomopsis tenuituba slendertube skyrocket Polemoniaceae
Ipomopsis tenuituba ssp. latiloba slendertube skyrocket Polemoniaceae
Ipomopsis thurberi El Paso skyrocket Polemoniaceae
Iresine bloodleaf Amaranthaceae
Iresine heterophylla Standley's bloodleaf Amaranthaceae
Iris iris Iridaceae
Iris missouriensis Rocky Mountain iris Iridaceae
Isocoma goldenbush Asteraceae
Isocoma acradenia alkali goldenbush Asteraceae
Isocoma acradenia var. acradenia alkali goldenbush Asteraceae
Isocoma acradenia var. eremophila alkali goldenbush Asteraceae
Isocoma azteca Aztec goldenbush Asteraceae
Isocoma pluriflora southern goldenbush Asteraceae
Isocoma rusbyi Rusby's goldenbush Asteraceae
Isocoma tenuisecta burroweed Asteraceae
Isoetes quillwort Isoetaceae
Isoetes bolanderi Bolander's quillwort Isoetaceae
Iva marsh elder Asteraceae
Iva axillaris povertyweed Asteraceae
Ivesia mousetail Rosaceae
Ivesia arizonica rock whitefeather Rosaceae
Ivesia arizonica var. arizonica Arizona whitefeather Rosaceae
Ivesia arizonica var. saxosa rock whitefeather Rosaceae
Ivesia multifoliolata manyleaf mousetail Rosaceae
Ivesia sabulosa Intermountain mousetail Rosaceae
J
Jacquemontia clustervine Convolvulaceae
Jacquemontia agrestis midnightblue clustervine Convolvulaceae
Jacquemontia pringlei Pringle's clustervine Convolvulaceae
Jaltomata false holly Solanaceae
Jaltomata procumbens creeping false holly Solanaceae
Jamesia cliffbush Hydrangeaceae
Jamesia americana fivepetal cliffbush Hydrangeaceae
Jamesia americana var. americana fivepetal cliffbush Hydrangeaceae
Janusia janusia Malpighiaceae
Janusia gracilis slender janusia Malpighiaceae
Jatropha nettlespurge Euphorbiaceae
Jatropha cardiophylla sangre de cristo Euphorbiaceae
Jatropha cinerea Arizona nettlespurge Euphorbiaceae
Jatropha cuneata physicnut Euphorbiaceae
Jatropha macrorhiza ragged nettlespurge Euphorbiaceae
Jatropha macrorhiza var. septemfida ragged nettlespurge Euphorbiaceae
Juglans walnut Juglandaceae
Juglans major Arizona walnut Juglandaceae
Juncus rush Juncaceae
Juncus acuminatus tapertip rush Juncaceae
Juncus acutus spiny rush Juncaceae
Juncus acutus ssp. leopoldii Leopold's rush Juncaceae
Juncus ambiguus seasice rush Juncaceae
Juncus arcticus arctic rush Juncaceae
Juncus arcticus ssp. littoralis mountain rush Juncaceae
Juncus articulatus jointleaf rush Juncaceae
Juncus brevicaudatus narrowpanicle rush Juncaceae
Juncus bufonius toad rush Juncaceae
Juncus bufonius var. bufonius toad rush Juncaceae
Juncus bufonius var. occidentalis toad rush Juncaceae
Juncus confusus Colorado rush Juncaceae
Juncus cooperi Cooper's rush Juncaceae
Juncus drummondii Drummond's rush Juncaceae
Juncus drummondii var. drummondii Drummond's rush Juncaceae
Juncus dudleyi Dudley's rush Juncaceae
Juncus effusus common rush Juncaceae
Juncus effusus var. brunneus lamp rush Juncaceae
Juncus effusus var. exiguus lamp rush Juncaceae
Juncus effusus var. pacificus Pacific rush Juncaceae
Juncus ensifolius swordleaf rush Juncaceae
Juncus interior inland rush Juncaceae
Juncus interior var. arizonicus Arizona rush Juncaceae
Juncus interior var. interior inland rush Juncaceae
Juncus interior var. neomexicanus New Mexico rush Juncaceae
Juncus longistylis longstyle rush Juncaceae
Juncus longistylis var. longistylis longstyle rush Juncaceae
Juncus longistylis var. scabratus longstyle rush Juncaceae
Juncus macrophyllus longleaf rush Juncaceae
Juncus marginatus grassleaf rush Juncaceae
Juncus mertensianus Mertens' rush Juncaceae
Juncus mexicanus Mexican rush Juncaceae
Juncus nevadensis Sierra rush Juncaceae
Juncus nevadensis var. badius Sierra rush Juncaceae
Juncus nodosus knotted rush Juncaceae
Juncus nodosus var. nodosus knotted rush Juncaceae
Juncus occidentalis western rush Juncaceae
Juncus saximontanus Rocky Mountain rush Juncaceae
Juncus tenuis poverty rush Juncaceae
Juncus torreyi Torrey's rush Juncaceae
Juncus tracyi Tracy's rush Juncaceae
Juncus xiphioides irisleaf rush Juncaceae
Juniperus juniper Cupressaceae
Juniperus californica California juniper Cupressaceae
Juniperus coahuilensis redberry juniper Cupressaceae
Juniperus coahuilensis var. arizonica redberry juniper Cupressaceae
Juniperus coahuilensis var. coahuilensis redberry juniper Cupressaceae
Juniperus communis common juniper Cupressaceae
Juniperus communis var. depressa common juniper Cupressaceae
Juniperus deppeana alligator juniper Cupressaceae
Juniperus monosperma oneseed juniper Cupressaceae
Juniperus osteosperma Utah juniper Cupressaceae
Juniperus scopulorum Rocky Mountain juniper Cupressaceae
Justicia water-willow Acanthaceae
Justicia californica beloperone Acanthaceae
Justicia candicans Arizona water-willow Acanthaceae
Justicia longii longflower tube tongue Acanthaceae
Justicia sonorae Sonoran water-willow Acanthaceae
K
Kallstroemia caltrop Zygophyllaceae
Kallstroemia californica California caltrop Zygophyllaceae
Kallstroemia grandiflora Arizona poppy Zygophyllaceae
Kallstroemia hirsutissima hairy caltrop Zygophyllaceae
Kallstroemia parviflora warty caltrop Zygophyllaceae
Keckiella keckiella Scrophulariaceae
Keckiella antirrhinoides snapdragon penstemon Scrophulariaceae
Keckiella antirrhinoides ssp. microphylla snapdragon penstemon Scrophulariaceae
Kelloggia kelloggia Rubiaceae
Kelloggia galioides milk kelloggia Rubiaceae
Koanophyllon thoroughwort Asteraceae
Koanophyllon solidaginifolium shrubby thoroughwort Asteraceae
Koeberlinia allthorn Capparaceae
Koeberlinia spinosa crown of thorns Capparaceae
Koeberlinia spinosa var. spinosa crown of thorns Capparaceae
Koeberlinia spinosa var. tenuispina crown of thorns Capparaceae
Koeleria Junegrass Poaceae
Koeleria macrantha prairie Junegrass Poaceae
Krameria ratany Krameriaceae
Krameria erecta littleleaf ratany Krameriaceae
Krameria grayi white ratany Krameriaceae
Krameria lanceolata trailing krameria Krameriaceae
Krascheninnikovia winterfat Chenopodiaceae
Krascheninnikovia lanata winterfat Chenopodiaceae
Krigia dwarfdandelion Asteraceae
Krigia biflora twoflower dwarfdandelion Asteraceae
Krigia biflora var. biflora twoflower dwarfdandelion Asteraceae
Krigia biflora var. viridis twoflower dwarfdandelion Asteraceae
L
Lactuca lettuce Asteraceae
Lactuca graminifolia grassleaf lettuce Asteraceae
Lactuca graminifolia var. arizonica grassleaf lettuce Asteraceae
Lactuca ludoviciana biannual lettuce Asteraceae
Lactuca saligna willowleaf lettuce Asteraceae
Lactuca serriola prickly lettuce Asteraceae
Lactuca tatarica blue lettuce Asteraceae
Lactuca tatarica var. pulchella blue lettuce Asteraceae
Laennecia horseweed Asteraceae
Laennecia coulteri Coulter's horseweed Asteraceae
Laennecia eriophylla Cochise horseweed Asteraceae
Laennecia schiedeana pineland horseweed Asteraceae
Laennecia sophiifolia leafy horseweed Asteraceae
Lagascea lagascea Asteraceae
Lagascea decipiens doll's head Asteraceae
Lagenaria lagenaria Cucurbitaceae
Lagenaria siceraria bottle gourd Cucurbitaceae
Lamarckia goldentop grass Poaceae
Lamarckia aurea goldentop grass Poaceae
Lamium deadnettle Lamiaceae
Lamium amplexicaule henbit deadnettle Lamiaceae
Landoltia Lemnaceae
Landoltia punctata dotted duckmeat Lemnaceae
Langloisia langloisia Polemoniaceae
Langloisia setosissima Great Basin langloisia Polemoniaceae
Langloisia setosissima ssp. setosissima Great Basin langloisia Polemoniaceae
Lantana lantana Verbenaceae
Lantana achyranthifolia brushland shrubverbena Verbenaceae
Lantana camara lantana Verbenaceae
Lantana urticoides West Indian shrubverbena Verbenaceae
Lappula stickseed Boraginaceae
Lappula occidentalis flatspine stickseed Boraginaceae
Lappula occidentalis var. cupulata flatspine stickseed Boraginaceae
Lappula occidentalis var. occidentalis flatspine stickseed Boraginaceae
Lappula squarrosa European stickseed Boraginaceae
Lapsana nipplewort Asteraceae
Lapsana communis common nipplewort Asteraceae
Larrea creosote bush Zygophyllaceae
Larrea tridentata creosote bush Zygophyllaceae
Larrea tridentata var. tridentata creosote bush Zygophyllaceae
Lasianthaea lasianthaea Asteraceae
Lasianthaea podocephala San Pedro daisy Asteraceae
Lasthenia goldfields Asteraceae
Lasthenia californica California goldfields Asteraceae
Lasthenia californica ssp. californica California goldfields Asteraceae
Lathyrus pea Fabaceae
Lathyrus brachycalyx Bonneville pea Fabaceae
Lathyrus brachycalyx ssp. zionis bush pea Fabaceae
Lathyrus eucosmus bush vetchling Fabaceae
Lathyrus graminifolius grassleaf pea Fabaceae
Lathyrus laetivirens aspen pea Fabaceae
Lathyrus lanszwertii Nevada pea Fabaceae
Lathyrus lanszwertii var. leucanthus Nevada pea Fabaceae
Lathyrus latifolius perennial pea Fabaceae
Lathyrus pauciflorus fewflower pea Fabaceae
Lathyrus pauciflorus var. utahensis Utah pea Fabaceae
Layia tidytips Asteraceae
Layia glandulosa whitedaisy tidytips Asteraceae
Layia platyglossa coastal tidytips Asteraceae
Leersia cutgrass Poaceae
Leersia oryzoides rice cutgrass Poaceae
Leibnitzia sunbonnets Asteraceae
Leibnitzia lyrata Seeman's sunbonnets Asteraceae
Lemna duckweed Lemnaceae
Lemna aequinoctialis lesser duckweed Lemnaceae
Lemna gibba swollen duckweed Lemnaceae
Lemna minor common duckweed Lemnaceae
Lemna minuta least duckweed Lemnaceae
Lemna obscura little duckweed Lemnaceae
Lemna perpusilla minute duckweed Lemnaceae
Lemna trisulca star duckweed Lemnaceae
Lemna turionifera turion duckweed Lemnaceae
Lemna valdiviana valdivia duckweed Lemnaceae
Leontodon hawkbit Asteraceae
Leontodon taraxacoides lesser hawkbit Asteraceae
Leontodon taraxacoides ssp. taraxacoides lesser hawkbit Asteraceae
Leonurus motherwort Lamiaceae
Leonurus cardiaca common motherwort Lamiaceae
Leonurus cardiaca ssp. cardiaca common motherwort Lamiaceae
Lepidium pepperweed Brassicaceae
Lepidium alyssoides mesa pepperwort Brassicaceae
Lepidium alyssoides var. alyssoides mesa pepperwort Brassicaceae
Lepidium alyssoides var. junceum mesa pepperwort Brassicaceae
Lepidium campestre field pepperweed Brassicaceae
Lepidium densiflorum common pepperweed Brassicaceae
Lepidium densiflorum var. densiflorum common pepperweed Brassicaceae
Lepidium densiflorum var. macrocarpum bigseed pepperweed Brassicaceae
Lepidium densiflorum var. ramosum miner's pepperweed Brassicaceae
Lepidium fremontii desert pepperweed Brassicaceae
Lepidium fremontii var. fremontii desert pepperweed Brassicaceae
Lepidium integrifolium thickleaf pepperweed Brassicaceae
Lepidium integrifolium var. integrifolium thickleaf pepperweed Brassicaceae
Lepidium lasiocarpum shaggyfruit pepperweed Brassicaceae
Lepidium lasiocarpum var. lasiocarpum shaggyfruit pepperweed Brassicaceae
Lepidium lasiocarpum var. wrightii Wright's pepperweed Brassicaceae
Lepidium latifolium broadleaved pepperweed Brassicaceae
Lepidium montanum mountain pepperweed Brassicaceae
Lepidium montanum var. canescens mountain pepperweed Brassicaceae
Lepidium montanum var. cinereum mountain pepperweed Brassicaceae
Lepidium montanum var. glabrum mountain pepperweed Brassicaceae
Lepidium montanum var. jonesii Jones' pepperweed Brassicaceae
Lepidium montanum var. montanum mountain pepperweed Brassicaceae
Lepidium oblongum veiny pepperweed Brassicaceae
Lepidium oblongum var. oblongum veiny pepperweed Brassicaceae
Lepidium perfoliatum clasping pepperweed Brassicaceae
Lepidium ramosissimum manybranched pepperweed Brassicaceae
Lepidium ramosissimum var. bourgeauanum Bourgeau's pepperweed Brassicaceae
Lepidium thurberi Thurber's pepperweed Brassicaceae
Lepidium virginicum Virginia pepperweed Brassicaceae
Lepidium virginicum var. medium intermediate pepperweed Brassicaceae
Lepidium virginicum var. pubescens hairy pepperweed Brassicaceae
Lepidospartum broomsage Asteraceae
Lepidospartum squamatum California broomsage Asteraceae
Leptochloa sprangletop Poaceae
Leptochloa dubia green sprangletop Poaceae
Leptochloa fusca Malabar sprangletop Poaceae
Leptochloa fusca ssp. fascicularis bearded sprangletop Poaceae
Leptochloa fusca ssp. uninervia Mexican sprangletop Poaceae
Leptochloa nealleyi Nealley's sprangletop Poaceae
Leptochloa panicea mucronate sprangletop Poaceae
Leptochloa panicea ssp. brachiata mucronate sprangeltop Poaceae
Leptochloa viscida sticky sprangletop Poaceae
Leptosiphon Polemoniaceae
Leptosiphon aureus golden linanthus Polemoniaceae
Leptosiphon aureus ssp. aureus golden linanthus Polemoniaceae
Leptosiphon aureus ssp. decorus golden linanthus Polemoniaceae
Leptosiphon floribundum many-flower linanthus Polemoniaceae
Leptosiphon floribundum ssp. floribundum manyflower linanthus Polemoniaceae
Leptosiphon nuttallii Nuttall's linanthus Polemoniaceae
Leptosiphon nuttallii ssp. tenuilobus Nuttall's linanthus Polemoniaceae
Lesquerella bladderpod Brassicaceae
Lesquerella arizonica Arizona bladderpod Brassicaceae
Lesquerella cinerea basin bladderpod Brassicaceae
Lesquerella fendleri Fendler's bladderpod Brassicaceae
Lesquerella gooddingii Goodding's bladderpod Brassicaceae
Lesquerella gordonii Gordon's bladderpod Brassicaceae
Lesquerella gordonii var. gordonii Gordon's bladderpod Brassicaceae
Lesquerella intermedia mid bladderpod Brassicaceae
Lesquerella kaibabensis Kaibab bladderpod Brassicaceae
Lesquerella ludoviciana foothill bladderpod Brassicaceae
Lesquerella pinetorum White Mountain bladderpod Brassicaceae
Lesquerella purpurea rose bladderpod Brassicaceae
Lesquerella rectipes straight bladderpod Brassicaceae
Lesquerella tenella Moapa bladderpod Brassicaceae
Lesquerella wardii Ward's bladderpod Brassicaceae
Lessingia lessingia Asteraceae
Lessingia lemmonii Lemmon's lessingia Asteraceae
Lessingia lemmonii var. lemmonii Lemmon's lessingia Asteraceae
Leucaena leadtree Fabaceae
Leucaena leucocephala white leadtree Fabaceae
Leucaena leucocephala ssp. glabrata Fabaceae
Leucanthemum daisy Asteraceae
Leucanthemum vulgare oxeye daisy Asteraceae
Leuciva Asteraceae
Leuciva dealbata woolly marsh elder Asteraceae
Leucocrinum starlily Liliaceae
Leucocrinum montanum common starlily Liliaceae
Lewisia lewisia Portulacaceae
Lewisia brachycalyx shortsepal lewisia Portulacaceae
Lewisia nevadensis Nevada lewisia Portulacaceae
Lewisia pygmaea alpine lewisia Portulacaceae
Lewisia rediviva bitter root Portulacaceae
Lewisia rediviva var. rediviva bitter root Portulacaceae
Leymus wildrye Poaceae
Leymus cinereus basin wildrye Poaceae
Leymus racemosus mammoth wildrye Poaceae
Leymus salinus saline wildrye Poaceae
Leymus salinus ssp. mojavensis Mojave wildrye Poaceae
Leymus salinus ssp. salinus saline wildrye Poaceae
Leymus simplex alkali wildrye Poaceae
Leymus triticoides beardless wildrye Poaceae
Ligusticum licorice-root Apiaceae
Ligusticum porteri Porter's licorice-root Apiaceae
Ligusticum porteri var. porteri Porter's licorice-root Apiaceae
Lilaeopsis grasswort Apiaceae
Lilaeopsis schaffneriana Schaffner's grasswort Apiaceae
Lilaeopsis schaffneriana var. recurva Schaffner's grasswort Apiaceae
Lilium lily Liliaceae
Lilium parryi lemon lily Liliaceae
Lilium philadelphicum wood lily Liliaceae
Lilium philadelphicum var. andinum wood lily Liliaceae
Limonium sea lavender Plumbaginaceae
Limonium limbatum Trans-Pecos sea lavender Plumbaginaceae
Limosella mudwort Scrophulariaceae
Limosella acaulis Owyhee mudwort Scrophulariaceae
Limosella aquatica water mudwort Scrophulariaceae
Limosella pubiflora Chiricahua Mountain mudwort Scrophulariaceae
Linanthus linanthus Polemoniaceae
Linanthus bigelovii Bigelow's linanthus Polemoniaceae
Linanthus demissus desertsnow Polemoniaceae
Linanthus dichotomus eveningsnow Polemoniaceae
Linanthus filiformis yellow gilia Polemoniaceae
Linanthus jonesii Jones' linanthus Polemoniaceae
Linanthus pungens granite prickly phlox Polemoniaceae
Linaria toadflax Scrophulariaceae
Linaria dalmatica Dalmatian toadflax Scrophulariaceae
Linaria dalmatica ssp. dalmatica Dalmatian toadflax Scrophulariaceae
Linaria maroccana Moroccan toadflax Scrophulariaceae
Linaria vulgaris butter and eggs Scrophulariaceae
Lindernia false pimpernel Scrophulariaceae
Lindernia dubia yellowseed false pimpernel Scrophulariaceae
Lindernia dubia var. anagallidea yellowseed false pimpernel Scrophulariaceae
Lindernia dubia var. dubia yellowseed false pimpernel Scrophulariaceae
Linnaea twinflower Caprifoliaceae
Linnaea borealis twinflower Caprifoliaceae
Linnaea borealis ssp. americana twinflower Caprifoliaceae
Linum flax Linaceae
Linum aristatum bristle flax Linaceae
Linum australe southern flax Linaceae
Linum australe var. australe southern flax Linaceae
Linum australe var. glandulosum southern flax Linaceae
Linum lewisii Lewis flax Linaceae
Linum lewisii var. lewisii prairie flax Linaceae
Linum neomexicanum New Mexico yellow flax Linaceae
Linum pratense meadow flax Linaceae
Linum puberulum plains flax Linaceae
Linum subteres sprucemont flax Linaceae
Linum usitatissimum common flax Linaceae
Lipocarpha halfchaff sedge Cyperaceae
Lipocarpha aristulata awned halfchaff sedge Cyperaceae
Lipocarpha drummondii Drummond's halfchaff sedge Cyperaceae
Lipocarpha micrantha smallflower halfchaff sedge Cyperaceae
Listera twayblade Orchidaceae
Listera convallarioides broadlipped twayblade Orchidaceae
Lithophragma woodland-star Saxifragaceae
Lithophragma tenellum slender woodland-star Saxifragaceae
Lithospermum stoneseed Boraginaceae
Lithospermum cobrense smooththroat stoneseed Boraginaceae
Lithospermum confine Arizona stoneseed Boraginaceae
Lithospermum incisum narrowleaf stoneseed Boraginaceae
Lithospermum multiflorum manyflowered stoneseed Boraginaceae
Lithospermum obtusifolium roundleaf stoneseed Boraginaceae
Lithospermum viride green stoneseed Boraginaceae
Lobelia lobelia Campanulaceae
Lobelia anatina Apache lobelia Campanulaceae
Lobelia cardinalis cardinalflower Campanulaceae
Lobelia fenestralis fringeleaf lobelia Campanulaceae
Lobelia laxiflora Sierra Madre lobelia Campanulaceae
Lobelia laxiflora var. angustifolia Sierra Madre lobelia Campanulaceae
Lobularia lobularia Brassicaceae
Lobularia maritima sweet alyssum Brassicaceae
Loeflingia loeflingia Caryophyllaceae
Loeflingia squarrosa spreading pygmyleaf Caryophyllaceae
Loeflingia squarrosa ssp. cactorum spreading pygmyleaf Caryophyllaceae
Loeflingia squarrosa ssp. squarrosa spreading pygmyleaf Caryophyllaceae
Loeselia false calico Polemoniaceae
Loeselia glandulosa glandular false calico Polemoniaceae
Loeseliastrum calico Polemoniaceae
Loeseliastrum schottii Schott's calico Polemoniaceae
Logfia cottonrose Asteraceae
Logfia arizonica Arizona cottonrose Asteraceae
Logfia californica California cottonrose Asteraceae
Logfia depressa dwarf cottonrose Asteraceae
Lolium ryegrass Poaceae
Lolium perenne perennial ryegrass Poaceae
Lolium perenne ssp. multiflorum Italian ryegrass Poaceae
Lolium perenne ssp. perenne perennial ryegrass Poaceae
Lolium rigidum Wimmera ryegrass Poaceae
Lolium temulentum Darnel ryegrass Poaceae
Lolium temulentum ssp. temulentum Darnel ryegrass Poaceae
Lomatium desertparsley Apiaceae
Lomatium bicolor Wasatch desertparsley Apiaceae
Lomatium bicolor var. leptocarpum Wasatch desertparsley Apiaceae
Lomatium dissectum fernleaf biscuitroot Apiaceae
Lomatium dissectum var. multifidum carrotleaf biscuitroot Apiaceae
Lomatium foeniculaceum desert biscuitroot Apiaceae
Lomatium foeniculaceum ssp. macdougalii Macdougal's biscuitroot Apiaceae
Lomatium mohavense Mojave desertparsley Apiaceae
Lomatium mohavense ssp. mohavense Mojave desertparsley Apiaceae
Lomatium nevadense Nevada biscuitroot Apiaceae
Lomatium nevadense var. nevadense Nevada biscuitroot Apiaceae
Lomatium nevadense var. parishii Parish's biscuitroot Apiaceae
Lomatium orientale Northern Idaho biscuitroot Apiaceae
Lomatium parryi Utah desertparsley Apiaceae
Lomatium scabrum rough desertparsley Apiaceae
Lomatium scabrum var. tripinnatum rough desertparsley Apiaceae
Lomatium simplex Great Basin desertparsley Apiaceae
Lomatium simplex var. simplex Great Basin desertparsley Apiaceae
Lonicera honeysuckle Caprifoliaceae
Lonicera albiflora western white honeysuckle Caprifoliaceae
Lonicera arizonica Arizona honeysuckle Caprifoliaceae
Lonicera ciliosa orange honeysuckle Caprifoliaceae
Lonicera interrupta chaparral honeysuckle Caprifoliaceae
Lonicera involucrata twinberry honeysuckle Caprifoliaceae
Lonicera involucrata var. involucrata twinberry honeysuckle Caprifoliaceae
Lonicera japonica Japanese honeysuckle Caprifoliaceae
Lonicera utahensis Utah honeysuckle Caprifoliaceae
Lotus trefoil Fabaceae
Lotus alamosanus Sonoran bird's-foot trefoil Fabaceae
Lotus corniculatus bird's-foot trefoil Fabaceae
Lotus corniculatus var. corniculatus bird's-foot trefoil Fabaceae
Lotus greenei Greene's bird's-foot trefoil Fabaceae
Lotus hamatus San Diego bird's-foot trefoil Fabaceae
Lotus humistratus foothill deervetch Fabaceae
Lotus mearnsii Mearns' bird's-foot trefoil Fabaceae
Lotus mearnsii var. equisolensis Mearns' bird's-foot trefoil Fabaceae
Lotus mearnsii var. mearnsii Mearns' bird's-foot trefoil Fabaceae
Lotus oblongifolius streambank bird's-foot trefoil Fabaceae
Lotus oblongifolius var. oblongifolius streambank bird's-foot trefoil Fabaceae
Lotus plebeius New Mexico bird's-foot trefoil Fabaceae
Lotus rigidus shrubby deervetch Fabaceae
Lotus salsuginosus coastal bird's-foot trefoil Fabaceae
Lotus salsuginosus var. brevivexillus coastal bird's-foot trefoil Fabaceae
Lotus scoparius common deerweed Fabaceae
Lotus scoparius var. brevialatus western bird's-foot trefoil Fabaceae
Lotus strigosus strigose bird's-foot trefoil Fabaceae
Lotus strigosus var. tomentellus strigose bird's-foot trefoil Fabaceae
Lotus unifoliolatus American bird's-foot trefoil Fabaceae
Lotus unifoliolatus var. unifoliolatus American bird's-foot trefoil Fabaceae
Lotus utahensis Utah bird's-foot trefoil Fabaceae
Lotus wrightii Wright's deervetch Fabaceae
Ludwigia primrose-willow Onagraceae
Ludwigia palustris marsh seedbox Onagraceae
Ludwigia peploides floating primrose-willow Onagraceae
Ludwigia peploides ssp. peploides floating primrose-willow Onagraceae
Ludwigia repens creeping primrose-willow Onagraceae
Lupinus lupine Fabaceae
Lupinus alpestris Great Basin lupine Fabaceae
Lupinus ammophilus sand lupine Fabaceae
Lupinus argenteus silvery lupine Fabaceae
Lupinus argenteus ssp. argenteus silvery lupine Fabaceae
Lupinus argenteus ssp. argenteus var. argenteus silvery lupine Fabaceae
Lupinus argenteus ssp. argenteus var. laxiflorus silvery lupine Fabaceae
Lupinus aridus desert lupine Fabaceae
Lupinus aridus ssp. aridus desert lupine Fabaceae
Lupinus arizonicus Arizona lupine Fabaceae
Lupinus arizonicus ssp. arizonicus Arizona lupine Fabaceae
Lupinus arizonicus ssp. arizonicus var. arizonicus Arizona lupine Fabaceae
Lupinus arizonicus ssp. arizonicus var. barbatulus Arizona lupine Fabaceae
Lupinus arizonicus ssp. setosissimus Arizona lupine Fabaceae
Lupinus arizonicus ssp. sonorensis Sonora lupine Fabaceae
Lupinus barbiger bearded lupine Fabaceae
Lupinus bicolor miniature lupine Fabaceae
Lupinus bicolor ssp. microphyllus miniature lupine Fabaceae
Lupinus bicolor ssp. pipersmithii miniature lupine Fabaceae
Lupinus brevicaulis shortstem lupine Fabaceae
Lupinus caudatus tailcup lupine Fabaceae
Lupinus caudatus ssp. argophyllus Kellogg's spurred lupine Fabaceae
Lupinus caudatus ssp. caudatus tailcup lupine Fabaceae
Lupinus caudatus ssp. cutleri Cutler's spurred lupine Fabaceae
Lupinus chihuahuensis Chihuahuan lupine Fabaceae
Lupinus concinnus bajada lupine Fabaceae
Lupinus concinnus ssp. orcuttii Orcutt's lupine Fabaceae
Lupinus flavoculatus yelloweyes Fabaceae
Lupinus hillii Hill's lupine Fabaceae
Lupinus hillii var. arizonicus Hill's lupine Fabaceae
Lupinus hillii var. hillii Hill's lupine Fabaceae
Lupinus hillii var. osterhoutianus Osterhout's lupine Fabaceae
Lupinus huachucanus Huachuca Mountain lupine Fabaceae
Lupinus kingii King's lupine Fabaceae
Lupinus kingii var. kingii King's lupine Fabaceae
Lupinus latifolius broadleaf lupine Fabaceae
Lupinus latifolius ssp. leucanthus broadleaf lupine Fabaceae
Lupinus lemmonii Lemmon's lupine Fabaceae
Lupinus neomexicanus New Mexico lupine Fabaceae
Lupinus odoratus Mojave lupine Fabaceae
Lupinus odoratus var. odoratus Mojave lupine Fabaceae
Lupinus odoratus var. pilosellus Mojave lupine Fabaceae
Lupinus palmeri bluebonnet lupine Fabaceae
Lupinus pusillus rusty lupine Fabaceae
Lupinus pusillus ssp. intermontanus Intermountain lupine Fabaceae
Lupinus pusillus ssp. pusillus rusty lupine Fabaceae
Lupinus pusillus ssp. rubens rusty lupine Fabaceae
Lupinus sericeus silky lupine Fabaceae
Lupinus sericeus ssp. huffmanii silky lupine Fabaceae
Lupinus sericeus ssp. sericeus silky lupine Fabaceae
Lupinus sericeus ssp. sericeus var. sericeus silky lupine Fabaceae
Lupinus shockleyi purple desert lupine Fabaceae
Lupinus sparsiflorus Coulter's lupine Fabaceae
Lupinus sparsiflorus ssp. mohavensis Coulter's lupine Fabaceae
Lupinus succulentus hollowleaf annual lupine Fabaceae
Lupinus volutans pinyon lupine Fabaceae
Luzula woodrush Juncaceae
Luzula multiflora common woodrush Juncaceae
Luzula multiflora ssp. frigida common woodrush Juncaceae
Luzula parviflora smallflowered woodrush Juncaceae
Luzula spicata spiked woodrush Juncaceae
Lycium desert-thorn Solanaceae
Lycium andersonii water jacket Solanaceae
Lycium andersonii var. andersonii water jacket Solanaceae
Lycium andersonii var. deserticola water jacket Solanaceae
Lycium andersonii var. wrightii water jacket Solanaceae
Lycium berlandieri Berlandier's wolfberry Solanaceae
Lycium berlandieri var. longistylum Berlandier's wolfberry Solanaceae
Lycium berlandieri var. parviflorum Berlandier's wolfberry Solanaceae
Lycium brevipes Baja desert-thorn Solanaceae
Lycium californicum California desert-thorn Solanaceae
Lycium californicum var. arizonicum Solanaceae
Lycium cooperi peach thorn Solanaceae
Lycium exsertum Arizona desert-thorn Solanaceae
Lycium fremontii Fremont's desert-thorn Solanaceae
Lycium macrodon desert wolfberry Solanaceae
Lycium pallidum pale desert-thorn Solanaceae
Lycium pallidum var. pallidum pale desert-thorn Solanaceae
Lycium parishii Parish's desert-thorn Solanaceae
Lycium torreyi Torrey wolfberry Solanaceae
Lycopodium clubmoss Lycopodiaceae
Lycopodium annotinum stiff clubmoss Lycopodiaceae
Lycopus waterhorehound Lamiaceae
Lycopus americanus American water horehound Lamiaceae
Lycopus asper rough bugleweed Lamiaceae
Lycurus wolfstail Poaceae
Lycurus phleoides common wolfstail Poaceae
Lycurus setosus bristly wolfstail Poaceae
Lygodesmia skeletonplant Asteraceae
Lygodesmia arizonica Arizona skeletonplant Asteraceae
Lygodesmia grandiflora largeflower skeletonplant Asteraceae
Lygodesmia juncea rush skeletonplant Asteraceae
Lyrocarpa lyrepod Brassicaceae
Lyrocarpa coulteri Coulter's lyrepod Brassicaceae
Lyrocarpa coulteri var. coulteri Coulter's lyrepod Brassicaceae
Lysiloma false tamarind Fabaceae
Lysiloma watsonii littleleaf false tamarind Fabaceae
Lysimachia yellow loosestrife Primulaceae
Lysimachia hybrida lowland yellow loosestrife Primulaceae
Lythrum loosestrife Lythraceae
Lythrum californicum California loosestrife Lythraceae
M
Mabrya mabrya Scrophulariaceae
Mabrya acerifolia brittlestem Scrophulariaceae
Machaeranthera tansyaster Asteraceae
Machaeranthera arida arid tansyaster Asteraceae
Machaeranthera asteroides fall tansyaster Asteraceae
Machaeranthera asteroides var. asteroides fall tansyaster Asteraceae
Machaeranthera asteroides var. glandulosa Asteraceae
Machaeranthera bigelovii Bigelow's tansyaster Asteraceae
Machaeranthera bigelovii var. mucronata Bigelow's tansyaster Asteraceae
Machaeranthera canescens hoary tansyaster Asteraceae
Machaeranthera canescens ssp. canescens hoary tansyaster Asteraceae
Machaeranthera canescens ssp. canescens var. ambigua hoary tansyaster Asteraceae
Machaeranthera canescens ssp. canescens var. canescens hoary tansyaster Asteraceae
Machaeranthera canescens ssp. glabra hoary tansyaster Asteraceae
Machaeranthera canescens ssp. glabra var. aristata hoary tansyaster Asteraceae
Machaeranthera canescens ssp. glabra var. glabra hoary tansyaster Asteraceae
Machaeranthera carnosa shrubby alkaliaster Asteraceae
Machaeranthera carnosa var. carnosa shrubby alkaliaster Asteraceae
Machaeranthera gracilis slender goldenweed Asteraceae
Machaeranthera grindelioides rayless tansyaster Asteraceae
Machaeranthera grindelioides var. depressa rayless tansyaster Asteraceae
Machaeranthera grindelioides var. grindelioides rayless tansyaster Asteraceae
Machaeranthera juncea rush bristleweed Asteraceae
Machaeranthera parviflora smallflower tansyaster Asteraceae
Machaeranthera pinnatifida lacy tansyaster Asteraceae
Machaeranthera pinnatifida ssp. gooddingii Goodding's tansyaster Asteraceae
Machaeranthera pinnatifida ssp. gooddingii var. gooddingii Goodding's tansyaster Asteraceae
Machaeranthera pinnatifida ssp. gooddingii var. paradoxa Goodding's tansyaster Asteraceae
Machaeranthera pinnatifida ssp. pinnatifida lacy tansyaster Asteraceae
Machaeranthera pinnatifida ssp. pinnatifida var. chihuahuana Chihuahua tansyaster Asteraceae
Machaeranthera pinnatifida ssp. pinnatifida var. pinnatifida lacy tansyaster Asteraceae
Machaeranthera riparia Chiricahua Mountain tansyaster Asteraceae
Machaeranthera tagetina mesa tansyaster Asteraceae
Machaeranthera tanacetifolia tanseyleaf tansyaster Asteraceae
Macromeria giant-trumpets Boraginaceae
Macromeria viridiflora giant-trumpets Boraginaceae
Macromeria viridiflora var. thurberi Thurber's giant-trumpets Boraginaceae
Macromeria viridiflora var. viridiflora giant-trumpets Boraginaceae
Macroptilium bushbean Fabaceae
Macroptilium atropurpureum purple bushbean Fabaceae
Macroptilium gibbosifolium variableleaf bushbean Fabaceae
Macroptilium supinum supine bean Fabaceae
Macrosiphonia rocktrumpet Apocynaceae
Macrosiphonia brachysiphon Huachuca Mountain rocktrumpet Apocynaceae
Madia tarweed Asteraceae
Madia glomerata mountain tarweed Asteraceae
Mahonia barberry Berberidaceae
Mahonia fremontii Fremont's mahonia Berberidaceae
Mahonia haematocarpa red barberry Berberidaceae
Mahonia repens creeping barberry Berberidaceae
Mahonia trifoliolata algerita Berberidaceae
Maianthemum mayflower Liliaceae
Maianthemum racemosum feathery false lily of the valley Liliaceae
Maianthemum racemosum ssp. amplexicaule feathery false lily of the valley Liliaceae
Maianthemum stellatum starry false lily of the valley Liliaceae
Malacothrix desertdandelion Asteraceae
Malacothrix clevelandii Cleveland's desertdandelion Asteraceae
Malacothrix coulteri snake's head Asteraceae
Malacothrix fendleri Fendler's desertdandelion Asteraceae
Malacothrix glabrata smooth desertdandelion Asteraceae
Malacothrix sonchoides sowthistle desertdandelion Asteraceae
Malacothrix sonorae Sonoran desertdandelion Asteraceae
Malacothrix stebbinsii Stebbins' desertdandelion Asteraceae
Malacothrix torreyi Torrey's desertdandelion Asteraceae
Malaxis adder's-mouth orchid Orchidaceae
Malaxis corymbosa Huachuca Mountain adder's-mouth orchid Orchidaceae
Malaxis porphyrea Cochise adder's-mouth orchid Orchidaceae
Malaxis soulei Chiricahua adder's-mouth orchid Orchidaceae
Malaxis tenuis Arizona adder's-mouth orchid Orchidaceae
Malcolmia malcolmia Brassicaceae
Malcolmia africana African mustard Brassicaceae
Malva mallow Malvaceae
Malva neglecta common mallow Malvaceae
Malva parviflora cheeseweed mallow Malvaceae
Malva sylvestris high mallow Malvaceae
Malvastrum false mallow Malvaceae
Malvastrum bicuspidatum shrubby false mallow Malvaceae
Malvella mallow Malvaceae
Malvella lepidota scurfymallow Malvaceae
Malvella leprosa alkali mallow Malvaceae
Malvella sagittifolia arrowleaf mallow Malvaceae
Mammillaria globe cactus Cactaceae
Mammillaria barbata greenflower nipple cactus Cactaceae
Mammillaria grahamii Graham's nipple cactus Cactaceae
Mammillaria heyderi little nipple cactus Cactaceae
Mammillaria heyderi var. bullingtoniana little nipple cactus Cactaceae
Mammillaria heyderi var. heyderi little nipple cactus Cactaceae
Mammillaria heyderi var. macdougalii Macdougal's nipple cactus Cactaceae
Mammillaria heyderi var. meiacantha little nipple cactus Cactaceae
Mammillaria lasiacantha lacespine nipple cactus Cactaceae
Mammillaria mainiae counterclockwise nipple cactus Cactaceae
Mammillaria tetrancistra common fishhook cactus Cactaceae
Mammillaria thornberi Thornber's nipple cactus Cactaceae
Mammillaria wrightii Wright's nipple cactus Cactaceae
Mammillaria wrightii var. wilcoxii Wilcox's nipple cactus Cactaceae
Mammillaria wrightii var. wrightii Wright's nipple cactus Cactaceae
Manihot cassava Euphorbiaceae
Manihot angustiloba desertmountain manihot Euphorbiaceae
Manihot davisiae Arizona manihot Euphorbiaceae
Mantisalca mantisalca Asteraceae
Mantisalca salmantica dagger flower Asteraceae
Marah manroot Cucurbitaceae
Marah gilensis Gila manroot Cucurbitaceae
Margaranthus margaranthus Solanaceae
Margaranthus solanaceus netted globecherry Solanaceae
Marina false prairie-clover Fabaceae
Marina calycosa San Pedro false prairie-clover Fabaceae
Marina diffusa spreading false prairie-clover Fabaceae
Marina parryi Parry's false prairie-clover Fabaceae
Marrubium horehound Lamiaceae
Marrubium vulgare horehound Lamiaceae
Marsilea waterclover Marsileaceae
Marsilea mollis Chihuahuan waterclover Marsileaceae
Marsilea vestita hairy waterclover Marsileaceae
Matelea milkvine Asclepiadaceae
Matelea arizonica Arizona milkvine Asclepiadaceae
Matelea balbisii Balbis' milkvine Asclepiadaceae
Matelea cordifolia Sonoran milkvine Asclepiadaceae
Matelea parvifolia spearleaf Asclepiadaceae
Matelea producta Texas milkvine Asclepiadaceae
Matricaria mayweed Asteraceae
Matricaria courrantiana crown mayweed Asteraceae
Matricaria discoidea disc mayweed Asteraceae
Matricaria recutita German chamomile Asteraceae
Matthiola stock Brassicaceae
Matthiola longipetala night scented stock Brassicaceae
Maurandella maurandella Scrophulariaceae
Maurandella antirrhiniflora roving sailor Scrophulariaceae
Mecardonia mecardonia Scrophulariaceae
Mecardonia procumbens baby jump-up Scrophulariaceae
Medicago alfalfa Fabaceae
Medicago lupulina black medick Fabaceae
Medicago minima little bur-clover Fabaceae
Medicago polymorpha burclover Fabaceae
Medicago sativa alfalfa Fabaceae
Medicago sativa ssp. falcata yellow alfalfa Fabaceae
Medicago sativa ssp. sativa alfalfa Fabaceae
Melampodium blackfoot Asteraceae
Melampodium leucanthum plains blackfoot Asteraceae
Melampodium longicorne Arizona blackfoot Asteraceae
Melampodium strigosum shaggy blackfoot Asteraceae
Melia melia Meliaceae
Melia azedarach Chinaberrytree Meliaceae
Melica melicgrass Poaceae
Melica frutescens woody melicgrass Poaceae
Melica imperfecta smallflower melicgrass Poaceae
Melica nitens threeflower melicgrass Poaceae
Melica porteri Porter's melicgrass Poaceae
Melica porteri var. laxa Porter's melicgrass Poaceae
Melica porteri var. porteri Porter's melicgrass Poaceae
Melilotus sweetclover Fabaceae
Melilotus indicus annual yellow sweetclover Fabaceae
Melilotus officinalis yellow sweetclover Fabaceae
Melinis stinkgrass Poaceae
Melinis repens rose Natal grass Poaceae
Menodora menodora Oleaceae
Menodora scabra rough menodora Oleaceae
Menodora spinescens spiny menodora Oleaceae
Mentha mint Lamiaceae
Mentha arvensis wild mint Lamiaceae
Mentha rotundifolia Lamiaceae
Mentha spicata spearmint Lamiaceae
Mentha suaveolens apple mint Lamiaceae
Mentzelia blazingstar Loasaceae
Mentzelia affinis yellowcomet Loasaceae
Mentzelia albicaulis whitestem blazingstar Loasaceae
Mentzelia aspera tropical blazingstar Loasaceae
Mentzelia asperula Organ Mountain blazingstar Loasaceae
Mentzelia collomiae Sunset Crater blazingstar Loasaceae
Mentzelia cronquistii Cronquist's blazingstar Loasaceae
Mentzelia desertorum desert blazingstar Loasaceae
Mentzelia incisa streambank blazingstar Loasaceae
Mentzelia involucrata whitebract blazingstar Loasaceae
Mentzelia involucrata var. involucrata whitebract blazingstar Loasaceae
Mentzelia isolata isolated blazingstar Loasaceae
Mentzelia jonesii Jones' blazingstar Loasaceae
Mentzelia lindheimeri Lindheimer's blazingstar Loasaceae
Mentzelia lindleyi Lindley's blazingstar Loasaceae
Mentzelia montana variegated-bract blazingstar Loasaceae
Mentzelia multiflora Adonis blazingstar Loasaceae
Mentzelia multiflora var. integra Adonis blazingstar Loasaceae
Mentzelia multiflora var. longiloba Adonis blazingstar Loasaceae
Mentzelia multiflora var. multiflora Adonis blazingstar Loasaceae
Mentzelia nuda bractless blazingstar Loasaceae
Mentzelia nuda var. stricta bractless blazingstar Loasaceae
Mentzelia obscura Pacific blazingstar Loasaceae
Mentzelia oligosperma chickenthief Loasaceae
Mentzelia oreophila Argus blazingstar Loasaceae
Mentzelia polita polished blazingstar Loasaceae
Mentzelia pterosperma wingseed blazingstar Loasaceae
Mentzelia pumila dwarf mentzelia Loasaceae
Mentzelia pumila var. pumila dwarf mentzelia Loasaceae
Mentzelia rusbyi Rusby's blazingstar Loasaceae
Mentzelia tricuspis spinyhair blazingstar Loasaceae
Mentzelia veatchiana Veatch's blazingstar Loasaceae
Menyanthes buckbean Menyanthaceae
Menyanthes trifoliata buckbean Menyanthaceae
Mertensia bluebells Boraginaceae
Mertensia arizonica aspen bluebells Boraginaceae
Mertensia ciliata tall fringed bluebells Boraginaceae
Mertensia ciliata var. ciliata tall fringed bluebells Boraginaceae
Mertensia franciscana Franciscan bluebells Boraginaceae
Mertensia macdougalii Macdougal's bluebells Boraginaceae
Mesembryanthemum iceplant Aizoaceae
Mesembryanthemum crystallinum common iceplant Aizoaceae
Mesembryanthemum nodiflorum slenderleaf iceplant Aizoaceae
Microchloa smallgrass Poaceae
Microchloa kunthii Kunth's smallgrass Poaceae
Microseris silverpuffs Asteraceae
Microseris heterocarpa grassland silverpuffs Asteraceae
Microseris lindleyi Lindley's silverpuffs Asteraceae
Microsteris Polemoniaceae
Microsteris gracilis slender phlox Polemoniaceae
Microsteris gracilis var. gracilis slender phlox Polemoniaceae
Microsteris gracilis var. humilior slender phlox Polemoniaceae
Milla milla Liliaceae
Milla biflora Mexican star Liliaceae
Mimetanthe mimetanthe Scrophulariaceae
Mimetanthe pilosa false monkeyflower Scrophulariaceae
Mimosa sensitive plant Fabaceae
Mimosa aculeaticarpa catclaw mimosa Fabaceae
Mimosa aculeaticarpa var. biuncifera catclaw mimosa Fabaceae
Mimosa distachya Mexican mimosa Fabaceae
Mimosa distachya var. laxiflora Arizona mimosa Fabaceae
Mimosa dysocarpa velvetpod mimosa Fabaceae
Mimosa grahamii Graham's mimosa Fabaceae
Mimulus monkeyflower Scrophulariaceae
Mimulus bigelovii Bigelow's monkeyflower Scrophulariaceae
Mimulus bigelovii var. bigelovii Bigelow's monkeyflower Scrophulariaceae
Mimulus cardinalis scarlet monkeyflower Scrophulariaceae
Mimulus dentilobus toothpetal monkeyflower Scrophulariaceae
Mimulus eastwoodiae Eastwood's monkeyflower Scrophulariaceae
Mimulus floribundus manyflowered monkeyflower Scrophulariaceae
Mimulus glabratus roundleaf monkeyflower Scrophulariaceae
Mimulus glabratus var. glabratus roundleaf monkeyflower Scrophulariaceae
Mimulus glabratus var. jamesii James' monkeyflower Scrophulariaceae
Mimulus guttatus seep monkeyflower Scrophulariaceae
Mimulus parryi annual redspot monkeyflower Scrophulariaceae
Mimulus primuloides primrose monkeyflower Scrophulariaceae
Mimulus primuloides var. primuloides primrose monkeyflower Scrophulariaceae
Mimulus rubellus little redstem monkeyflower Scrophulariaceae
Mimulus spissus compact monkeyflower Scrophulariaceae
Mimulus suksdorfii Suksdorf's monkeyflower Scrophulariaceae
Mimulus tilingii Tiling's monkeyflower Scrophulariaceae
Mimulus tilingii var. tilingii Tiling's monkeyflower Scrophulariaceae
Minuartia stitchwort Caryophyllaceae
Minuartia douglasii Douglas' stitchwort Caryophyllaceae
Minuartia filiorum threadbranch stitchwort Caryophyllaceae
Minuartia obtusiloba twinflower sandwort Caryophyllaceae
Minuartia rubella beautiful sandwort Caryophyllaceae
Mirabilis four o'clock Nyctaginaceae
Mirabilis albida white four o'clock Nyctaginaceae
Mirabilis coccinea scarlet four o'clock Nyctaginaceae
Mirabilis decipiens broadleaf four o'clock Nyctaginaceae
Mirabilis glabra smooth four o'clock Nyctaginaceae
Mirabilis hirsuta hairy four o'clock Nyctaginaceae
Mirabilis jalapa marvel of Peru Nyctaginaceae
Mirabilis laevis desert wishbone-bush Nyctaginaceae
Mirabilis laevis var. retrorsa wishbone-bush Nyctaginaceae
Mirabilis laevis var. villosa wishbone-bush Nyctaginaceae
Mirabilis linearis narrowleaf four o'clock Nyctaginaceae
Mirabilis longiflora sweet four o'clock Nyctaginaceae
Mirabilis longiflora var. wrightiana sweet four o'clock Nyctaginaceae
Mirabilis melanotricha Nyctaginaceae
Mirabilis multiflora Colorado four o'clock Nyctaginaceae
Mirabilis multiflora var. glandulosa Colorado four o'clock Nyctaginaceae
Mirabilis multiflora var. multiflora Colorado four o'clock Nyctaginaceae
Mirabilis multiflora var. pubescens Colorado four o'clock Nyctaginaceae
Mirabilis oxybaphoides smooth spreading four o'clock Nyctaginaceae
Mirabilis pumila dwarf four o'clock Nyctaginaceae
Mirabilis tenuiloba longlobe four o'clock Nyctaginaceae
Mitracarpus girdlepod Rubiaceae
Mitracarpus breviflorus white girdlepod Rubiaceae
Modiola bristlemallow Malvaceae
Modiola caroliniana Carolina bristlemallow Malvaceae
Mohavea mohavea Scrophulariaceae
Mohavea breviflora golden desert-snapdragon Scrophulariaceae
Mohavea confertiflora ghost flower Scrophulariaceae
Mollugo carpetweed Molluginaceae
Mollugo cerviana threadstem carpetweed Molluginaceae
Mollugo verticillata green carpetweed Molluginaceae
Moluccella moluccella Lamiaceae
Moluccella laevis shellflower Lamiaceae
Monarda beebalm Lamiaceae
Monarda citriodora lemon beebalm Lamiaceae
Monarda citriodora ssp. austromontana lemon beebalm Lamiaceae
Monarda citriodora ssp. citriodora lemon beebalm Lamiaceae
Monarda citriodora ssp. citriodora var. citriodora lemon beebalm Lamiaceae
Monarda fistulosa wild bergamot Lamiaceae
Monarda fistulosa ssp. fistulosa wild bergamot Lamiaceae
Monarda fistulosa ssp. fistulosa var. menthifolia mintleaf bergamot Lamiaceae
Monarda pectinata pony beebalm Lamiaceae
Monardella monardella Lamiaceae
Monardella arizonica Arizona monardella Lamiaceae
Monardella glauca pale monardella Lamiaceae
Monardella lanceolata mustang monardella Lamiaceae
Monardella lanceolata var. lanceolata mustang monardella Lamiaceae
Monardella linoides flaxleaf monardella Lamiaceae
Monardella linoides ssp. linoides flaxleaf monardella Lamiaceae
Monardella linoides ssp. stricta flaxleaf monardella Lamiaceae
Moneses single delight Pyrolaceae
Moneses uniflora single delight Pyrolaceae
Monnina monnina Polygalaceae
Monnina wrightii blue pygmyflower Polygalaceae
Monolepis povertyweed Chenopodiaceae
Monolepis nuttalliana Nuttall's povertyweed Chenopodiaceae
Monoptilon desertstar Asteraceae
Monoptilon bellidiforme daisy desertstar Asteraceae
Monoptilon bellioides Mojave desertstar Asteraceae
Monotropa Indianpipe Monotropaceae
Monotropa hypopithys pinesap Monotropaceae
Monroa false buffalograss Poaceae
Monroa squarrosa false buffalograss Poaceae
Montia minerslettuce Portulacaceae
Montia chamissoi water minerslettuce Portulacaceae
Mortonia saddlebush Celastraceae
Mortonia scabrella Rio Grande saddlebush Celastraceae
Mortonia utahensis Utah mortonia Celastraceae
Morus mulberry Moraceae
Morus alba white mulberry Moraceae
Morus microphylla Texas mulberry Moraceae
Muhlenbergia muhly Poaceae
Muhlenbergia andina foxtail muhly Poaceae
Muhlenbergia appressa Devils Canyon muhly Poaceae
Muhlenbergia arenacea ear muhly Poaceae
Muhlenbergia arenicola sand muhly Poaceae
Muhlenbergia arizonica Arizona muhly Poaceae
Muhlenbergia asperifolia scratchgrass Poaceae
Muhlenbergia brevis short muhly Poaceae
Muhlenbergia curtifolia Utah muhly Poaceae
Muhlenbergia depauperata sixweeks muhly Poaceae
Muhlenbergia dubia pine muhly Poaceae
Muhlenbergia dumosa bamboo muhly Poaceae
Muhlenbergia elongata sycamore muhly Poaceae
Muhlenbergia eludens gravelbar muhly Poaceae
Muhlenbergia emersleyi bullgrass Poaceae
Muhlenbergia filiculmis slimstem muhly Poaceae
Muhlenbergia filiformis pullup muhly Poaceae
Muhlenbergia fragilis delicate muhly Poaceae
Muhlenbergia glauca desert muhly Poaceae
Muhlenbergia longiligula longtongue muhly Poaceae
Muhlenbergia mexicana Mexican muhly Poaceae
Muhlenbergia microsperma littleseed muhly Poaceae
Muhlenbergia minutissima annual muhly Poaceae
Muhlenbergia montana mountain muhly Poaceae
Muhlenbergia palmeri southwestern muhly Poaceae
Muhlenbergia pauciflora New Mexico muhly Poaceae
Muhlenbergia pectinata combtop muhly Poaceae
Muhlenbergia peruviana Peruvian muhly Poaceae
Muhlenbergia polycaulis cliff muhly Poaceae
Muhlenbergia porteri bush muhly Poaceae
Muhlenbergia pungens sandhill muhly Poaceae
Muhlenbergia racemosa marsh muhly Poaceae
Muhlenbergia ramulosa green muhly Poaceae
Muhlenbergia repens creeping muhly Poaceae
Muhlenbergia richardsonis mat muhly Poaceae
Muhlenbergia rigens deergrass Poaceae
Muhlenbergia rigida purple muhly Poaceae
Muhlenbergia schreberi nimblewill Poaceae
Muhlenbergia setifolia curlyleaf muhly Poaceae
Muhlenbergia sinuosa marshland muhly Poaceae
Muhlenbergia straminea screwleaf muhly Poaceae
Muhlenbergia sylvatica woodland muhly Poaceae
Muhlenbergia tenuifolia slender muhly Poaceae
Muhlenbergia texana Texas muhly Poaceae
Muhlenbergia thurberi Thurber's muhly Poaceae
Muhlenbergia torreyi ring muhly Poaceae
Muhlenbergia utilis aparejograss Poaceae
Muhlenbergia wrightii spike muhly Poaceae
Myosotis forget-me-not Boraginaceae
Myosotis scorpioides true forget-me-not Boraginaceae
Myosotis verna spring forget-me-not Boraginaceae
Myosurus mousetail Ranunculaceae
Myosurus apetalus bristly mousetail Ranunculaceae
Myosurus apetalus var. montanus bristly mousetail Ranunculaceae
Myosurus cupulatus Arizona mousetail Ranunculaceae
Myosurus minimus tiny mousetail Ranunculaceae
Myosurus nitidus western mousetail Ranunculaceae
Myriophyllum watermilfoil Haloragaceae
Myriophyllum aquaticum parrot feather watermilfoil Haloragaceae
Myriophyllum quitense Andean watermilfoil Haloragaceae
Myriophyllum sibiricum shortspike watermilfoil Haloragaceae
Myriophyllum spicatum Eurasian watermilfoil Haloragaceae
N
Najas waternymph Najadaceae
Najas flexilis nodding waternymph Najadaceae
Najas guadalupensis southern waternymph Najadaceae
Najas guadalupensis ssp. guadalupensis southern waternymph Najadaceae
Najas marina spiny naiad Najadaceae
Nama fiddleleaf Hydrophyllaceae
Nama demissum purplemat Hydrophyllaceae
Nama demissum var. demissum purplemat Hydrophyllaceae
Nama dichotomum wishbone fiddleleaf Hydrophyllaceae
Nama hispidum bristly nama Hydrophyllaceae
Nama pusillum eggleaf fiddleleaf Hydrophyllaceae
Nama retrorsum betatakin fiddleleaf Hydrophyllaceae
Nama rothrockii Rothrock's fiddleleaf Hydrophyllaceae
Nama stenocarpum mud fiddleleaf Hydrophyllaceae
Nassella needlegrass Poaceae
Nassella viridula green needlegrass Poaceae
Nasturtium Brassicaceae
Nasturtium officinale watercress Brassicaceae
Navarretia pincushionplant Polemoniaceae
Navarretia breweri Brewer's navarretia Polemoniaceae
Navarretia intertexta needleleaf navarretia Polemoniaceae
Navarretia intertexta ssp. propinqua near navarretia Polemoniaceae
Navarretia leucocephala whitehead navarretia Polemoniaceae
Navarretia leucocephala ssp. minima least navarretia Polemoniaceae
Nemacaulis cottonheads Polygonaceae
Nemacaulis denudata cottonheads Polygonaceae
Nemacaulis denudata var. gracilis cottonheads Polygonaceae
Nemacladus threadplant Campanulaceae
Nemacladus glanduliferus glandular threadplant Campanulaceae
Nemacladus glanduliferus var. glanduliferus glandular threadplant Campanulaceae
Nemacladus glanduliferus var. orientalis glandular threadplant Campanulaceae
Nemacladus gracilis slender threadplant Campanulaceae
Nemacladus longiflorus longflower threadplant Campanulaceae
Nemacladus longiflorus var. breviflorus longflower threadplant Campanulaceae
Nemacladus longiflorus var. longiflorus longflower threadplant Campanulaceae
Nemacladus rubescens desert threadplant Campanulaceae
Nemacladus rubescens var. rubescens desert threadplant Campanulaceae
Nemacladus sigmoideus sigmoid threadplant Campanulaceae
Nemastylis pleatleaf Iridaceae
Nemastylis tenuis southwestern pleatleaf Iridaceae
Nemastylis tenuis ssp. pringlei Pringle's pleatleaf Iridaceae
Neogaerrhinum neogaerrhinum Scrophulariaceae
Neogaerrhinum filipes yellow twining snapdragon Scrophulariaceae
Nepeta catnip Lamiaceae
Nepeta cataria catnip Lamiaceae
Nephrolepis swordfern Dryopteridaceae
Nephrolepis exaltata Boston swordfern Dryopteridaceae
Nephrolepis exaltata ssp. exaltata Boston swordfern Dryopteridaceae
Nerium oleander Apocynaceae
Nerium oleander oleander Apocynaceae
Nicotiana tobacco Solanaceae
Nicotiana attenuata coyote tobacco Solanaceae
Nicotiana clevelandii Cleveland's tobacco Solanaceae
Nicotiana glauca tree tobacco Solanaceae
Nicotiana obtusifolia desert tobacco Solanaceae
Nicotiana obtusifolia var. obtusifolia desert tobacco Solanaceae
Nicotiana obtusifolia var. palmeri desert tobacco Solanaceae
Nicotiana quadrivalvis Indian tobacco Solanaceae
Nicotiana quadrivalvis var. bigelovii Bigelow's tobacco Solanaceae
Nissolia yellowhood Fabaceae
Nissolia schottii Schott's yellowhood Fabaceae
Nissolia wislizeni Arizona yellowhood Fabaceae
Nitrophila niterwort Chenopodiaceae
Nitrophila occidentalis boraxweed Chenopodiaceae
Noccaea Brassicaceae
Noccaea montana alpine pennycress Brassicaceae
Noccaea montana var. fendleri Fendler's pennycress Brassicaceae
Noccaea montana var. montana alpine pennycress Brassicaceae
Nolina beargrass Liliaceae
Nolina bigelovii Bigelow's nolina Liliaceae
Nolina microcarpa sacahuista Liliaceae
Nolina parryi Parry's beargrass Liliaceae
Nolina texana Texas sacahuista Liliaceae
Notholaena cloak fern Pteridaceae
Notholaena aschenborniana scaled cloak fern Pteridaceae
Notholaena californica California cloak fern Pteridaceae
Notholaena californica ssp. californica California cloak fern Pteridaceae
Notholaena grayi Gray's cloak fern Pteridaceae
Notholaena grayi ssp. grayi Gray's cloak fern Pteridaceae
Notholaena grayi ssp. sonorensis Sonoran cloak fern Pteridaceae
Notholaena lemmonii Lemmon's cloak fern Pteridaceae
Notholaena neglecta Maxon's cloak fern Pteridaceae
Notholaena standleyi star cloak fern Pteridaceae
Nothoscordum false garlic Liliaceae
Nothoscordum texanum Texas false garlic Liliaceae
Nuphar pond-lily Nymphaeaceae
Nuphar lutea yellow pond-lily Nymphaeaceae
Nuphar lutea ssp. polysepala Rocky Mountain pond-lily Nymphaeaceae
Nuttallanthus toadflax Scrophulariaceae
Nuttallanthus texanus Texas toadflax Scrophulariaceae
Nymphaea waterlily Nymphaeaceae
Nymphaea mexicana yellow waterlily Nymphaeaceae
Nymphaea odorata American white waterlily Nymphaeaceae
Nymphaea odorata ssp. odorata American white waterlily Nymphaeaceae
Nymphoides floatingheart Menyanthaceae
Nymphoides peltata yellow floatingheart Menyanthaceae
O
Ocimum basil Lamiaceae
Ocimum basilicum sweet basil Lamiaceae
Oenothera evening primrose Onagraceae
Oenothera albicaulis whitest evening primrose Onagraceae
Oenothera arizonica California evening primrose Onagraceae
Oenothera brachycarpa shortfruit evening primrose Onagraceae
Oenothera caespitosa tufted evening primrose Onagraceae
Oenothera caespitosa ssp. crinita tufted evening primrose Onagraceae
Oenothera caespitosa ssp. marginata tufted evening primrose Onagraceae
Oenothera caespitosa ssp. navajoensis Navajo evening primrose Onagraceae
Oenothera californica California evening primrose Onagraceae
Oenothera californica ssp. avita California evening primrose Onagraceae
Oenothera cavernae cavedwelling evening primrose Onagraceae
Oenothera coronopifolia crownleaf evening primrose Onagraceae
Oenothera deltoides birdcage evening primrose Onagraceae
Oenothera deltoides ssp. ambigua birdcage evening primrose Onagraceae
Oenothera deltoides ssp. deltoides birdcage evening primrose Onagraceae
Oenothera elata Hooker's evening primrose Onagraceae
Oenothera elata ssp. hirsutissima Hooker's evening primrose Onagraceae
Oenothera flava yellow evening primrose Onagraceae
Oenothera flava ssp. flava yellow evening primrose Onagraceae
Oenothera flava ssp. taraxacoides yellow evening primrose Onagraceae
Oenothera havardii Havard's evening primrose Onagraceae
Oenothera kunthiana Kunth's evening primrose Onagraceae
Oenothera longissima longstem evening primrose Onagraceae
Oenothera neomexicana New Mexico evening primrose Onagraceae
Oenothera pallida pale evening primrose Onagraceae
Oenothera pallida ssp. pallida pale evening primrose Onagraceae
Oenothera pallida ssp. runcinata pale evening primrose Onagraceae
Oenothera pallida ssp. trichocalyx pale evening primrose Onagraceae
Oenothera platanorum Fort Huachuca evening primrose Onagraceae
Oenothera primiveris desert evening primrose Onagraceae
Oenothera primiveris ssp. bufonis desert evening primrose Onagraceae
Oenothera primiveris ssp. primiveris desert evening primrose Onagraceae
Oenothera pubescens South American evening primrose Onagraceae
Oenothera rosea rose evening primrose Onagraceae
Oenothera speciosa pinkladies Onagraceae
Oenothera villosa hairy evening primrose Onagraceae
Oenothera villosa ssp. strigosa hairy evening primrose Onagraceae
Oligomeris oligomeris Resedaceae
Oligomeris linifolia lineleaf whitepuff Resedaceae
Olneya olneya Fabaceae
Olneya tesota desert ironwood Fabaceae
Onopordum cottonthistle Asteraceae
Onopordum acanthium Scotch cottonthistle Asteraceae
Ophioglossum adderstongue Ophioglossaceae
Ophioglossum engelmannii limestone adderstongue Ophioglossaceae
Ophioglossum polyphyllum large adderstongue Ophioglossaceae
Ophioglossum vulgatum southern adderstongue Ophioglossaceae
Opuntia pricklypear Cactaceae
Opuntia aurea golden pricklypear Cactaceae
Opuntia basilaris beavertail pricklypear Cactaceae
Opuntia basilaris var. basilaris beavertail pricklypear Cactaceae
Opuntia basilaris var. longiareolata beavertail pricklypear Cactaceae
Opuntia chlorotica dollarjoint pricklypear Cactaceae
Opuntia curvospina searchlight pricklypear Cactaceae
Opuntia engelmannii cactus apple Cactaceae
Opuntia engelmannii var. engelmannii cactus apple Cactaceae
Opuntia engelmannii var. flavispina cactus apple Cactaceae
Opuntia ficus-indica Barbary fig Cactaceae
Opuntia fragilis brittle pricklypear Cactaceae
Opuntia gosseliniana violet pricklypear Cactaceae
Opuntia laevis tulip pricklypear Cactaceae
Opuntia macrocentra purple pricklypear Cactaceae
Opuntia macrocentra var. macrocentra purple pricklypear Cactaceae
Opuntia macrorhiza twistspine pricklypear Cactaceae
Opuntia macrorhiza var. macrorhiza twistspine pricklypear Cactaceae
Opuntia macrorhiza var. pottsii twistspine pricklypear Cactaceae
Opuntia martiniana seashore cactus Cactaceae
Opuntia microdasys angel's-wings Cactaceae
Opuntia phaeacantha tulip pricklypear Cactaceae
Opuntia pinkavae Pinkava's pricklypear Cactaceae
Opuntia polyacantha plains pricklypear Cactaceae
Opuntia polyacantha var. erinacea grizzlybear pricklypear Cactaceae
Opuntia polyacantha var. hystricina grizzlybear pricklypear Cactaceae
Opuntia polyacantha var. nicholii Navajo Bridge pricklypear Cactaceae
Opuntia polyacantha var. polyacantha hairspine pricklypear Cactaceae
Opuntia santa-rita Santa Rita pricklypear Cactaceae
Opuntia vaseyi Vasey's coastal pricklypear Cactaceae
Oreochrysum goldenrod Asteraceae
Oreochrysum parryi Parry's goldenrod Asteraceae
Oreoxis oreoxis Apiaceae
Oreoxis alpina alpine oreoxis Apiaceae
Oreoxis alpina ssp. alpina alpine oreoxis Apiaceae
Orobanche broomrape Orobanchaceae
Orobanche cooperi desert broomrape Orobanchaceae
Orobanche cooperi ssp. cooperi desert broomrape Orobanchaceae
Orobanche cooperi ssp. latiloba desert broomrape Orobanchaceae
Orobanche fasciculata clustered broomrape Orobanchaceae
Orobanche ludoviciana Louisiana broomrape Orobanchaceae
Orobanche ludoviciana ssp. ludoviciana Louisiana broomrape Orobanchaceae
Orobanche ludoviciana ssp. multiflora manyflower broomrape Orobanchaceae
Orobanche multicaulis spiked broomrape Orobanchaceae
Orobanche uniflora oneflowered broomrape Orobanchaceae
Orthilia orthilia Pyrolaceae
Orthilia secunda sidebells wintergreen Pyrolaceae
Orthocarpus owl's-clover Scrophulariaceae
Orthocarpus luteus yellow owl's-clover Scrophulariaceae
Orthocarpus purpureoalbus purplewhite owl's-clover Scrophulariaceae
Osmorhiza sweetroot Apiaceae
Osmorhiza berteroi sweetcicely Apiaceae
Osmorhiza brachypoda California sweetcicely Apiaceae
Osmorhiza depauperata bluntseed sweetroot Apiaceae
Ostrya hophornbeam Betulaceae
Ostrya knowltonii Knowlton's hophornbeam Betulaceae
Oxalis woodsorrel Oxalidaceae
Oxalis albicans radishroot woodsorrel Oxalidaceae
Oxalis albicans ssp. albicans radishroot woodsorrel Oxalidaceae
Oxalis albicans ssp. pilosa radishroot woodsorrel Oxalidaceae
Oxalis alpina alpine woodsorrel Oxalidaceae
Oxalis caerulea blue woodsorrel Oxalidaceae
Oxalis corniculata creeping woodsorrel Oxalidaceae
Oxalis decaphylla tenleaf woodsorrel Oxalidaceae
Oxalis dillenii slender yellow woodsorrel Oxalidaceae
Oxalis drummondii Drummond's woodsorrel Oxalidaceae
Oxalis latifolia broadleaf woodsorrel Oxalidaceae
Oxalis pes-caprae Bermuda buttercup Oxalidaceae
Oxalis stricta common yellow oxalis Oxalidaceae
Oxalis violacea violet woodsorrel Oxalidaceae
Oxypolis cowbane Apiaceae
Oxypolis fendleri Fendler's cowbane Apiaceae
Oxyria mountainsorrel Polygonaceae
Oxyria digyna alpine mountainsorrel Polygonaceae
Oxytenia Asteraceae
Oxytenia acerosa copperweed Asteraceae
Oxytheca oxytheca Polygonaceae
Oxytheca perfoliata roundleaf oxytheca Polygonaceae
Oxytropis locoweed Fabaceae
Oxytropis lambertii purple locoweed Fabaceae
Oxytropis lambertii var. bigelovii purple locoweed Fabaceae
Oxytropis oreophila mountain oxytrope Fabaceae
Oxytropis oreophila var. juniperina mountain oxytrope Fabaceae
Oxytropis oreophila var. oreophila mountain oxytrope Fabaceae
P
Pachycereus pachycereus Cactaceae
Pachycereus schottii senita cactus Cactaceae
Packera ragwort Asteraceae
Packera cardamine bittercress ragwort Asteraceae
Packera cynthioides White Mountain ragwort Asteraceae
Packera franciscana San Francisco Peaks ragwort Asteraceae
Packera hartiana Hart's ragwort Asteraceae
Packera multilobata lobeleaf groundsel Asteraceae
Packera neomexicana New Mexico groundsel Asteraceae
Packera neomexicana var. metcalfei Metcalf's groundsel Asteraceae
Packera neomexicana var. mutabilis New Mexico groundsel Asteraceae
Packera neomexicana var. neomexicana New Mexico groundsel Asteraceae
Packera neomexicana var. toumeyi Toumey's groundsel Asteraceae
Packera plattensis prairie groundsel Asteraceae
Packera quaerens Mogollon Mountain ragwort Asteraceae
Packera quercetorum Oak Creek ragwort Asteraceae
Packera werneriifolia hoary groundsel Asteraceae
Palafoxia palafox Asteraceae
Palafoxia arida desert palafox Asteraceae
Palafoxia arida var. arida desert palafox Asteraceae
Palafoxia arida var. gigantea giant Spanish needle Asteraceae
Panicum panicgrass Poaceae
Panicum alatum winged panicgrass Poaceae
Panicum alatum var. alatum winged panicgrass Poaceae
Panicum alatum var. minus winged panicgrass Poaceae
Panicum antidotale blue panicum Poaceae
Panicum bulbosum bulb panicgrass Poaceae
Panicum capillare witchgrass Poaceae
Panicum dichotomiflorum fall panicgrass Poaceae
Panicum dichotomiflorum var. dichotomiflorum fall panicgrass Poaceae
Panicum hallii Hall's panicgrass Poaceae
Panicum hallii var. hallii Hall's panicgrass Poaceae
Panicum hirticaule Mexican panicgrass Poaceae
Panicum hirticaule var. hirticaule Mexican panicgrass Poaceae
Panicum hirticaule var. stramineum Sonoran panicgrass Poaceae
Panicum hirticaule var. verrucosum Mexican panicgrass Poaceae
Panicum miliaceum broomcorn millet Poaceae
Panicum miliaceum ssp. miliaceum broomcorn millet Poaceae
Panicum mohavense Mojave panicgrass Poaceae
Panicum obtusum vine mesquite Poaceae
Panicum urvilleanum desert panicgrass Poaceae
Panicum virgatum switchgrass Poaceae
Panicum virgatum var. virgatum switchgrass Poaceae
Papaver poppy Papaveraceae
Papaver somniferum opium poppy Papaveraceae
Pappophorum pappusgrass Poaceae
Pappophorum vaginatum whiplash pappusgrass Poaceae
Paraserianthes paraserianthes Fabaceae
Paraserianthes lophantha plume albizia Fabaceae
Parietaria pellitory Urticaceae
Parietaria hespera rillita pellitory Urticaceae
Parietaria hespera var. hespera rillita pellitory Urticaceae
Parietaria pensylvanica Pennsylvania pellitory Urticaceae
Parkinsonia paloverde Fabaceae
Parkinsonia aculeata Jerusalem thorn Fabaceae
Parkinsonia florida blue paloverde Fabaceae
Parkinsonia microphylla yellow paloverde Fabaceae
Parnassia grass of Parnassus Saxifragaceae
Parnassia palustris marsh grass of Parnassus Saxifragaceae
Parnassia palustris var. montanensis mountain grass of Parnassus Saxifragaceae
Paronychia nailwort Caryophyllaceae
Paronychia jamesii James' nailwort Caryophyllaceae
Paronychia sessiliflora creeping nailwort Caryophyllaceae
Parryella parryella Fabaceae
Parryella filifolia common dunebroom Fabaceae
Parthenice parthenice Asteraceae
Parthenice mollis annual monsterwort Asteraceae
Parthenium feverfew Asteraceae
Parthenium confertum Gray's feverfew Asteraceae
Parthenium confertum var. lyratum Gray's feverfew Asteraceae
Parthenium incanum mariola Asteraceae
Parthenocissus creeper Vitaceae
Parthenocissus vitacea woodbine Vitaceae
Pascopyrum wheatgrass Poaceae
Pascopyrum smithii western wheatgrass Poaceae
Paspalum crowngrass Poaceae
Paspalum dilatatum dallisgrass Poaceae
Paspalum distichum knotgrass Poaceae
Paspalum setaceum thin paspalum Poaceae
Paspalum virletii Virlet's paspalum Poaceae
Passiflora passionflower Passifloraceae
Passiflora bryonioides cupped passionflower Passifloraceae
Passiflora foetida fetid passionflower Passifloraceae
Passiflora foetida var. arizonica Arizonia passionflower Passifloraceae
Passiflora mexicana Mexican passionflower Passifloraceae
Pastinaca parsnip Apiaceae
Pastinaca sativa wild parsnip Apiaceae
Paxistima paxistima Celastraceae
Paxistima myrsinites Oregon boxleaf Celastraceae
Pectis chinchweed Asteraceae
Pectis angustifolia lemonscent Asteraceae
Pectis angustifolia var. angustifolia narrowleaf pectis Asteraceae
Pectis cylindrica Sonoran chinchweed Asteraceae
Pectis filipes fivebract chinchweed Asteraceae
Pectis filipes var. subnuda fivebract chinchweed Asteraceae
Pectis imberbis beardless chinchweed Asteraceae
Pectis linifolia romero macho Asteraceae
Pectis longipes longstalk chinchweed Asteraceae
Pectis papposa manybristle chinchweed Asteraceae
Pectis papposa var. grandis manybristle chinchweed Asteraceae
Pectis papposa var. papposa manybristle chinchweed Asteraceae
Pectis prostrata spreading chinchweed Asteraceae
Pectis rusbyi Rusby's chinchweed Asteraceae
Pectocarya combseed Boraginaceae
Pectocarya heterocarpa chuckwalla combseed Boraginaceae
Pectocarya penicillata sleeping combseed Boraginaceae
Pectocarya platycarpa broadfruit combseed Boraginaceae
Pectocarya recurvata curvenut combseed Boraginaceae
Pectocarya setosa moth combseed Boraginaceae
Pedicularis lousewort Scrophulariaceae
Pedicularis centranthera dwarf lousewort Scrophulariaceae
Pedicularis groenlandica elephanthead lousewort Scrophulariaceae
Pedicularis parryi Parry's lousewort Scrophulariaceae
Pedicularis parryi ssp. mogollonica Mogollon lousewort Scrophulariaceae
Pedicularis parryi ssp. parryi Parry's lousewort Scrophulariaceae
Pedicularis procera giant lousewort Scrophulariaceae
Pedicularis racemosa sickletop lousewort Scrophulariaceae
Pedicularis racemosa ssp. alba sickletop lousewort Scrophulariaceae
Pediocactus pincushion cactus Cactaceae
Pediocactus bradyi Brady's pincushion cactus Cactaceae
Pediocactus paradinei Kaibab pincushion cactus Cactaceae
Pediocactus peeblesianus Navajo pincushion cactus Cactaceae
Pediocactus simpsonii mountain ball cactus Cactaceae
Pediocactus simpsonii var. simpsonii mountain ball cactus Cactaceae
Pediomelum Indian breadroot Fabaceae
Pediomelum aromaticum aromatic Indian breadroot Fabaceae
Pediomelum castoreum beaver Indian breadroot Fabaceae
Pediomelum megalanthum Intermountain Indian breadroot Fabaceae
Pediomelum megalanthum var. epipsilum Intermountain Indian breadroot Fabaceae
Pediomelum megalanthum var. megalanthum Intermountain Indian breadroot Fabaceae
Pediomelum megalanthum var. retrorsum Intermountain Indian breadroot Fabaceae
Pediomelum mephiticum skunktop Fabaceae
Pediomelum pentaphyllum small Indian breadroot Fabaceae
Peganum peganum Zygophyllaceae
Peganum harmala harmal peganum Zygophyllaceae
Pellaea cliffbrake Pteridaceae
Pellaea atropurpurea purple cliffbrake Pteridaceae
Pellaea glabella smooth cliffbrake Pteridaceae
Pellaea glabella ssp. simplex smooth cliffbrake Pteridaceae
Pellaea intermedia intermediate cliffbrake Pteridaceae
Pellaea lyngholmii Lyngholm's cliffbrake Pteridaceae
Pellaea mucronata birdfoot cliffbrake Pteridaceae
Pellaea mucronata ssp. mucronata birdfoot cliffbrake Pteridaceae
Pellaea ternifolia Trans-Pecos cliffbrake Pteridaceae
Pellaea ternifolia ssp. arizonica Arizonia cliffbrake Pteridaceae
Pellaea truncata spiny cliffbrake Pteridaceae
Pellaea wrightiana Wright's cliffbrake Pteridaceae
Peniocereus peniocereus Cactaceae
Peniocereus greggii nightblooming cereus Cactaceae
Peniocereus greggii var. greggii nightblooming cereus Cactaceae
Peniocereus greggii var. transmontanus nightblooming cereus Cactaceae
Peniocereus striatus gearstem cactus Cactaceae
Pennellia mock thelypody Brassicaceae
Pennellia longifolia longleaf mock thelypody Brassicaceae
Pennellia micrantha mountain mock thelypody Brassicaceae
Pennisetum fountaingrass Poaceae
Pennisetum ciliare buffelgrass Poaceae
Pennisetum glaucum pearl millet Poaceae
Pennisetum setaceum crimson fountaingrass Poaceae
Penstemon beardtongue Scrophulariaceae
Penstemon albomarginatus whitemargin beardtongue Scrophulariaceae
Penstemon ambiguus gilia beardtongue Scrophulariaceae
Penstemon ambiguus var. laevissimus pink plains beardtongue Scrophulariaceae
Penstemon angustifolius broadbeard beardtongue Scrophulariaceae
Penstemon angustifolius var. venosus broadbeard beardtongue Scrophulariaceae
Penstemon barbatus beardlip penstemon Scrophulariaceae
Penstemon barbatus ssp. barbatus beardlip penstemon Scrophulariaceae
Penstemon barbatus ssp. torreyi Torrey's penstemon Scrophulariaceae
Penstemon barbatus ssp. trichander beardlip penstemon Scrophulariaceae
Penstemon bicolor pinto beardtongue Scrophulariaceae
Penstemon bicolor ssp. roseus pinto beardtongue Scrophulariaceae
Penstemon breviculus shortstem beardtongue Scrophulariaceae
Penstemon caespitosus mat penstemon Scrophulariaceae
Penstemon caespitosus var. desertipicti mat penstemon Scrophulariaceae
Penstemon clutei Sunset Crater beardtongue Scrophulariaceae
Penstemon cobaea cobaea beardtongue Scrophulariaceae
Penstemon comarrhenus dusty beardtongue Scrophulariaceae
Penstemon crideri Scrophulariaceae
Penstemon dasyphyllus Cochise beardtongue Scrophulariaceae
Penstemon deaveri Mt. Graham beardtongue Scrophulariaceae
Penstemon discolor Cataiina beardtongue Scrophulariaceae
Penstemon distans Mt. Tumbull beardtongue Scrophulariaceae
Penstemon eatonii firecracker penstemon Scrophulariaceae
Penstemon eatonii ssp. eatonii firecracker penstemon Scrophulariaceae
Penstemon eatonii ssp. exsertus firecracker penstemon Scrophulariaceae
Penstemon eatonii ssp. undosus firecracker penstemon Scrophulariaceae
Penstemon fendleri Fendler's penstemon Scrophulariaceae
Penstemon laevis southwestern beardtongue Scrophulariaceae
Penstemon lentus handsome beardtongue Scrophulariaceae
Penstemon lentus var. lentus handsome beardtongue Scrophulariaceae
Penstemon linarioides toadflax penstemon Scrophulariaceae
Penstemon linarioides ssp. coloradoensis toadflax penstemon Scrophulariaceae
Penstemon linarioides ssp. compactifolius toadflax beardtongue Scrophulariaceae
Penstemon linarioides ssp. linarioides toadflax beardtongue Scrophulariaceae
Penstemon linarioides ssp. maguirei Maguire's penstemon Scrophulariaceae
Penstemon linarioides ssp. sileri Siler's penstemon Scrophulariaceae
Penstemon mirus Scrophulariaceae
Penstemon nudiflorus Flagstaff beardtongue Scrophulariaceae
Penstemon oliganthus Apache beardtongue Scrophulariaceae
Penstemon ophianthus coiled anther penstemon Scrophulariaceae
Penstemon pachyphyllus thickleaf beardtongue Scrophulariaceae
Penstemon pachyphyllus var. congestus thickleaf beardtongue Scrophulariaceae
Penstemon palmeri Palmer's penstemon Scrophulariaceae
Penstemon palmeri var. eglandulosus scented beardtongue Scrophulariaceae
Penstemon palmeri var. palmeri Palmer's penstemon Scrophulariaceae
Penstemon parryi Parry's beardtongue Scrophulariaceae
Penstemon petiolatus petiolate beardtongue Scrophulariaceae
Penstemon pinifolius pineneedle beardtongue Scrophulariaceae
Penstemon pseudoputus Kaibab Plateau beardtongue Scrophulariaceae
Penstemon pseudospectabilis desert penstemon Scrophulariaceae
Penstemon pseudospectabilis ssp. connatifolius desert beardtongue Scrophulariaceae
Penstemon pseudospectabilis ssp. pseudospectabilis desert beardtongue Scrophulariaceae
Penstemon putus Black River beardtongue Scrophulariaceae
Penstemon ramosus lanceleaf beardtongue Scrophulariaceae
Penstemon rostriflorus Bridge penstemon Scrophulariaceae
Penstemon rydbergii Rydberg's penstemon Scrophulariaceae
Penstemon rydbergii var. aggregatus meadow beardtongue Scrophulariaceae
Penstemon rydbergii var. rydbergii swollen penstemon Scrophulariaceae
Penstemon stenophyllus Sonoran beardtongue Scrophulariaceae
Penstemon strictiformis Mancos penstemon Scrophulariaceae
Penstemon strictus Rocky Mountain penstemon Scrophulariaceae
Penstemon subulatus hackberry beardtongue Scrophulariaceae
Penstemon superbus superb beardtongue Scrophulariaceae
Penstemon thompsoniae Thompson's beardtongue Scrophulariaceae
Penstemon thompsoniae ssp. thompsoniae Thompson's beardtongue Scrophulariaceae
Penstemon thurberi Thurber's penstemon Scrophulariaceae
Penstemon utahensis Utah penstemon Scrophulariaceae
Penstemon virgatus upright blue beardtongue Scrophulariaceae
Penstemon watsonii Watson's penstemon Scrophulariaceae
Penstemon whippleanus Whipple's penstemon Scrophulariaceae
Pentagramma goldback fern Pteridaceae
Pentagramma triangularis goldback fern Pteridaceae
Pentagramma triangularis ssp. maxonii Maxon's goldback fern Pteridaceae
Pentzia pentzia Asteraceae
Pentzia incana African sheepbush Asteraceae
Pericome pericome Asteraceae
Pericome caudata mountain tail-leaf Asteraceae
Perideridia yampah Apiaceae
Perideridia parishii Parish's yampah Apiaceae
Perideridia parishii ssp. parishii Parish's yampah Apiaceae
Perityle rockdaisy Asteraceae
Perityle ajoensis Ajo rockdaisy Asteraceae
Perityle ambrosiifolia lace-leaved rockdaisy Asteraceae
Perityle ciliata fringed rockdaisy Asteraceae
Perityle cochisensis Cochise rockdaisy Asteraceae
Perityle congesta Grand Canyon rockdaisy Asteraceae
Perityle coronopifolia crowfoot rockdaisy Asteraceae
Perityle emoryi Emory's rockdaisy Asteraceae
Perityle gilensis Gila rockdaisy Asteraceae
Perityle gilensis var. gilensis Gila rockdaisy Asteraceae
Perityle gilensis var. salensis Salt River rockdaisy Asteraceae
Perityle gracilis three-lobed rockdaisy Asteraceae
Perityle lemmonii Lemmon's rockdaisy Asteraceae
Perityle microglossa shortray rockdaisy Asteraceae
Perityle saxicola Roosevelt Dam rockdaisy Asteraceae
Perityle tenella Springdale rockdaisy Asteraceae
Petalonyx sandpaper plant Loasaceae
Petalonyx linearis narrowleaf sandpaper plant Loasaceae
Petalonyx nitidus shinyleaf sandpaper plant Loasaceae
Petalonyx parryi Parry's sandpaper plant Loasaceae
Petalonyx thurberi Thurber's sandpaper plant Loasaceae
Petalonyx thurberi ssp. thurberi Thurber's sandpaper plant Loasaceae
Peteria peteria Fabaceae
Peteria scoparia rush peteria Fabaceae
Peteria thompsoniae Thompson's peteria Fabaceae
Petradoria rock goldenrod Asteraceae
Petradoria pumila rock goldenrod Asteraceae
Petradoria pumila ssp. graminea grass-leaved rock goldenrod Asteraceae
Petradoria pumila ssp. pumila rock goldenrod Asteraceae
Petrophytum rockspirea Rosaceae
Petrophytum caespitosum mat rockspirea Rosaceae
Petrophytum caespitosum var. caespitosum mat rockspirea Rosaceae
Petrophytum caespitosum var. elatius mat rockspirea Rosaceae
Peucephyllum pygmycedar Asteraceae
Peucephyllum schottii Schott's pygmycedar Asteraceae
Phacelia phacelia Hydrophyllaceae
Phacelia affinis limestone phacelia Hydrophyllaceae
Phacelia alba white phacelia Hydrophyllaceae
Phacelia arizonica Arizona phacelia Hydrophyllaceae
Phacelia bombycina Mangas Spring phacelia Hydrophyllaceae
Phacelia campanularia desertbells Hydrophyllaceae
Phacelia campanularia ssp. campanularia desertbells Hydrophyllaceae
Phacelia cephalotes virgin phacelia Hydrophyllaceae
Phacelia coerulea skyblue phacelia Hydrophyllaceae
Phacelia constancei Constance's phacelia Hydrophyllaceae
Phacelia crenulata cleftleaf wildheliotrope Hydrophyllaceae
Phacelia crenulata var. ambigua purplestem phacelia Hydrophyllaceae
Phacelia crenulata var. angustifolia cleftleaf phacelia Hydrophyllaceae
Phacelia crenulata var. corrugata cleftleaf wildheiotrope Hydrophyllaceae
Phacelia crenulata var. crenulata cleftleaf wildheliotrope Hydrophyllaceae
Phacelia crenulata var. minutiflora cleftleaf wildheliotrope Hydrophyllaceae
Phacelia cronquistiana Cronquist's phacelia Hydrophyllaceae
Phacelia cryptantha hiddenflower phacelia Hydrophyllaceae
Phacelia curvipes Washoe phacelia Hydrophyllaceae
Phacelia demissa Intermountain phacelia Hydrophyllaceae
Phacelia demissa var. demissa Intermountain phacelia Hydrophyllaceae
Phacelia distans distant phacelia Hydrophyllaceae
Phacelia egena Kaweah River phacelia Hydrophyllaceae
Phacelia filiformis narrow phacelia Hydrophyllaceae
Phacelia fremontii Fremont's phacelia Hydrophyllaceae
Phacelia glechomifolia pennyroyal leaf phacelia Hydrophyllaceae
Phacelia heterophylla varileaf phacelia Hydrophyllaceae
Phacelia heterophylla ssp. heterophylla varileaf phacelia Hydrophyllaceae
Phacelia howelliana harlequin phacelia Hydrophyllaceae
Phacelia integrifolia gypsum phacelia Hydrophyllaceae
Phacelia integrifolia var. integrifolia gypsum phacelia Hydrophyllaceae
Phacelia ivesiana Ives' phacelia Hydrophyllaceae
Phacelia ivesiana var. ivesiana Ives' phacelia Hydrophyllaceae
Phacelia ivesiana var. pediculoides Ives' phacelia Hydrophyllaceae
Phacelia laxiflora dozing phacelia Hydrophyllaceae
Phacelia lemmonii Lemmon's phacelia Hydrophyllaceae
Phacelia neglecta alkali phacelia Hydrophyllaceae
Phacelia neomexicana New Mexico phacelia Hydrophyllaceae
Phacelia palmeri Palmer's phacelia Hydrophyllaceae
Phacelia parishii Parish's phacelia Hydrophyllaceae
Phacelia parryi Parry's phacelia Hydrophyllaceae
Phacelia pedicellata pedicellate phacelia Hydrophyllaceae
Phacelia pulchella beautiful phacelia Hydrophyllaceae
Phacelia pulchella var. gooddingii Goodding's phacelia Hydrophyllaceae
Phacelia pulchella var. pulchella beautiful phacelia Hydrophyllaceae
Phacelia rafaelensis plateau phacelia Hydrophyllaceae
Phacelia ramosissima branching phacelia Hydrophyllaceae
Phacelia ramosissima var. latifolia branching phacelia Hydrophyllaceae
Phacelia rotundifolia roundleaf phacelia Hydrophyllaceae
Phacelia rupestris rock phacelia Hydrophyllaceae
Phacelia saxicola stonecrop phacelia Hydrophyllaceae
Phacelia scopulina Debeque phacelia Hydrophyllaceae
Phacelia scopulina var. submutica Debeque phacelia Hydrophyllaceae
Phacelia sericea silky phacelia Hydrophyllaceae
Phacelia sericea ssp. ciliosa silky phacelia Hydrophyllaceae
Phacelia serrata saw phacelia Hydrophyllaceae
Phacelia tanacetifolia lacy phacelia Hydrophyllaceae
Phacelia vallis-mortae Death Valley phacelia Hydrophyllaceae
Phacelia vallis-mortae var. vallis-mortae Death Valley phacelia Hydrophyllaceae
Phacelia welshii Welsh's phacelia Hydrophyllaceae
Phalaris canarygrass Poaceae
Phalaris angusta timothy canarygrass Poaceae
Phalaris aquatica bulbous canarygrass Poaceae
Phalaris arundinacea reed canarygrass Poaceae
Phalaris canariensis annual canarygrass Poaceae
Phalaris caroliniana Carolina canarygrass Poaceae
Phalaris minor littleseed canarygrass Poaceae
Phalaris paradoxa hood canarygrass Poaceae
Phanerophlebia phanerophlebia Dryopteridaceae
Phanerophlebia auriculata eared veinfern Dryopteridaceae
Phaseolus bean Fabaceae
Phaseolus acutifolius tepary bean Fabaceae
Phaseolus acutifolius var. acutifolius tepary bean Fabaceae
Phaseolus acutifolius var. latifolius tepary bean Fabaceae
Phaseolus acutifolius var. tenuifolius tepary bean Fabaceae
Phaseolus angustissimus slimleaf bean Fabaceae
Phaseolus filiformis slimjim bean Fabaceae
Phaseolus maculatus spotted bean Fabaceae
Phaseolus parvulus Pinos Altos Mountain bean Fabaceae
Phaseolus pedicellatus Sonoran bean Fabaceae
Phaseolus pedicellatus var. grayanus Gray's bean Fabaceae
Phaseolus ritensis Santa Rita Mountain bean Fabaceae
Phemeranthus Portulacaceae
Phemeranthus aurantiacus orange fameflower Portulacaceae
Phemeranthus brevifolius pygmy fameflower Portulacaceae
Phemeranthus confertiflorus New Mexico fameflower Portulacaceae
Phemeranthus humilis Pinos Altos fameflower Portulacaceae
Phemeranthus marginatus tepic fameflower Portulacaceae
Phemeranthus validulus Tusayan fameflower Portulacaceae
Philadelphus mock orange Hydrangeaceae
Philadelphus argenteus silver mock orange Hydrangeaceae
Philadelphus argyrocalyx silvercup mock orange Hydrangeaceae
Philadelphus crinitus Trans-Pecos mock orange Hydrangeaceae
Philadelphus maculatus spotted mock orange Hydrangeaceae
Philadelphus madrensis desert mountain mock orange Hydrangeaceae
Philadelphus microphyllus littleleaf mock orange Hydrangeaceae
Philadelphus palmeri Palmer's mock orange Hydrangeaceae
Philadelphus serpyllifolius thymeleaf mock orange Hydrangeaceae
Phleum timothy Poaceae
Phleum alpinum alpine timothy Poaceae
Phleum pratense timothy Poaceae
Phlox phlox Polemoniaceae
Phlox amabilis Arizona phlox Polemoniaceae
Phlox austromontana mountain phlox Polemoniaceae
Phlox austromontana ssp. austromontana mountain phlox Polemoniaceae
Phlox austromontana ssp. densa dense mountain phlox Polemoniaceae
Phlox austromontana ssp. prostrata prostrate mountain phlox Polemoniaceae
Phlox cluteana Navajo Mountain phlox Polemoniaceae
Phlox diffusa spreading phlox Polemoniaceae
Phlox diffusa ssp. subcarinata spreading phlox Polemoniaceae
Phlox griseola grayleaf phlox Polemoniaceae
Phlox griseola ssp. griseola grayleaf phlox Polemoniaceae
Phlox hoodii spiny phlox Polemoniaceae
Phlox hoodii ssp. canescens carpet phlox Polemoniaceae
Phlox hoodii ssp. hoodii spiny phlox Polemoniaceae
Phlox hoodii ssp. lanata carpet phlox Polemoniaceae
Phlox longifolia longleaf phlox Polemoniaceae
Phlox longifolia ssp. brevifolia longleaf phlox Polemoniaceae
Phlox longifolia ssp. longifolia longleaf phlox Polemoniaceae
Phlox speciosa showy phlox Polemoniaceae
Phlox speciosa ssp. woodhousei Woodhouse's phlox Polemoniaceae
Phlox stansburyi cold-desert phlox Polemoniaceae
Phlox stansburyi ssp. stansburyi cold-desert phlox Polemoniaceae
Phlox tenuifolia Santa Catalina Mountain phlox Polemoniaceae
Phlox triovulata threeseed phlox Polemoniaceae
Phlox viridis green phlox Polemoniaceae
Phlox viridis ssp. compacta green phlox Polemoniaceae
Phlox viridis ssp. longipes green phlox Polemoniaceae
Phlox viscida sticky phlox Polemoniaceae
Phoenix date palm Arecaceae
Phoenix dactylifera date palm Arecaceae
Pholisma pholisma Lennoaceae
Pholisma arenarium desert christmas tree Lennoaceae
Pholisma sonorae sandfood Lennoaceae
Pholistoma fiestaflower Hydrophyllaceae
Pholistoma auritum blue fiestaflower Hydrophyllaceae
Pholistoma auritum var. arizonicum Arizona fiestaflower Hydrophyllaceae
Pholistoma auritum var. auritum blue fiestaflower Hydrophyllaceae
Phoradendron mistletoe Viscaceae
Phoradendron californicum mesquite mistletoe Viscaceae
Phoradendron capitellatum downy mistletoe Viscaceae
Phoradendron coryae Cory's mistletoe Viscaceae
Phoradendron densum dense mistletoe Viscaceae
Phoradendron juniperinum juniper mistletoe Viscaceae
Phoradendron macrophyllum Colorado Desert mistletoe Viscaceae
Phoradendron macrophyllum ssp. macrophyllum Colorado Desert mistletoe Viscaceae
Phoradendron pauciflorum fir mistletoe Viscaceae
Phragmites reed Poaceae
Phragmites australis common reed Poaceae
Phyla fogfruit Verbenaceae
Phyla cuneifolia wedgeleaf Verbenaceae
Phyla lanceolata lanceleaf fogfruit Verbenaceae
Phyla nodiflora turkey tangle fogfruit Verbenaceae
Phyllanthus leafflower Euphorbiaceae
Phyllanthus polygonoides smartweed leaf-flower Euphorbiaceae
Phyllodoce mountainheath Ericaceae
Phyllodoce empetriformis pink mountainheath Ericaceae
Physalis groundcherry Solanaceae
Physalis acutifolia sharpleaf groundcherry Solanaceae
Physalis angulata cutleaf groundcherry Solanaceae
Physalis caudella southwestern groundcherry Solanaceae
Physalis crassifolia yellow nightshade groundcherry Solanaceae
Physalis crassifolia var. crassifolia yellow nightshade groundcherry Solanaceae
Physalis crassifolia var. versicolor yellow nightshade groundcherry Solanaceae
Physalis hederifolia ivyleaf groundcherry Solanaceae
Physalis hederifolia var. fendleri Fendler's groundcherry Solanaceae
Physalis hederifolia var. hederifolia ivyleaf groundcherry Solanaceae
Physalis heterophylla clammy groundcherry Solanaceae
Physalis heterophylla var. heterophylla clammy groundcherry Solanaceae
Physalis hispida prairie groundcherry Solanaceae
Physalis latiphysa broadleaf groundcherry Solanaceae
Physalis longifolia longleaf groundcherry Solanaceae
Physalis longifolia var. longifolia longleaf groundcherry Solanaceae
Physalis philadelphica Mexican groundcherry Solanaceae
Physalis philadelphica var. immaculata Mexican groundcherry Solanaceae
Physalis pubescens husk tomato Solanaceae
Physalis pubescens var. integrifolia husk tomato Solanaceae
Physalis subulata Chihuahuan groundcherry Solanaceae
Physalis subulata var. neomexicana New Mexican groundcherry Solanaceae
Physaria twinpod Brassicaceae
Physaria chambersii Chambers' twinpod Brassicaceae
Physaria newberryi Newberry's twinpod Brassicaceae
Physaria newberryi var. newberryi Newberry's twinpod Brassicaceae
Physaria newberryi var. racemosa Newberry's twinpod Brassicaceae
Physocarpus ninebark Rosaceae
Physocarpus monogynus mountain ninebark Rosaceae
Phytolacca pokeweed Phytolaccaceae
Phytolacca americana American pokeweed Phytolaccaceae
Phytolacca americana var. americana American pokeweed Phytolaccaceae
Phytolacca icosandra tropical pokeweed Phytolaccaceae
Phytolacca octandra red inkplant Phytolaccaceae
Picea spruce Pinaceae
Picea engelmannii Engelmann spruce Pinaceae
Picea engelmannii var. engelmannii Engelmann spruce Pinaceae
Picea engelmannii var. mexicana Pinaceae
Picea pungens blue spruce Pinaceae
Picradeniopsis bahia Asteraceae
Picradeniopsis oppositifolia oppositeleaf bahia Asteraceae
Picradeniopsis woodhousei Woodhouse's bahia Asteraceae
Picrothamnus bud sagebrush Asteraceae
Picrothamnus desertorum bud sagebrush Asteraceae
Pilostyles stemsucker Rafflesiaceae
Pilostyles thurberi Thurber's stemsucker Rafflesiaceae
Pinaropappus rocklettuce Asteraceae
Pinaropappus roseus white rocklettuce Asteraceae
Pinaropappus roseus var. foliosus white rocklettuce Asteraceae
Pinus pine Pinaceae
Pinus aristata bristlecone pine Pinaceae
Pinus arizonica Arizona pine Pinaceae
Pinus arizonica var. arizonica Arizona pine Pinaceae
Pinus arizonica var. stormiae Arizona pine Pinaceae
Pinus discolor border pinyon Pinaceae
Pinus edulis twoneedle pinyon Pinaceae
Pinus engelmannii Apache pine Pinaceae
Pinus flexilis limber pine Pinaceae
Pinus leiophylla Chihuahuan pine Pinaceae
Pinus leiophylla var. chihuahuana Chihuahuan pine Pinaceae
Pinus monophylla singleleaf pinyon Pinaceae
Pinus monophylla var. fallax singleleaf pinyon Pinaceae
Pinus monophylla var. monophylla singleleaf pinyon Pinaceae
Pinus ponderosa ponderosa pine Pinaceae
Pinus ponderosa var. scopulorum ponderosa pine Pinaceae
Pinus strobiformis southwestern white pine Pinaceae
Piptatherum ricegrass Poaceae
Piptatherum micranthum littleseed ricegrass Poaceae
Piptatherum miliaceum smilograss Poaceae
Piptochaetium speargrass Poaceae
Piptochaetium fimbriatum pinyon ricegrass Poaceae
Piptochaetium pringlei Pringle's speargrass Poaceae
Pisonia catchbirdtree Nyctaginaceae
Pisonia capitata Mexican devil's-claws Nyctaginaceae
Pistia pistia Araceae
Pistia stratiotes water lettuce Araceae
Plagiobothrys popcornflower Boraginaceae
Plagiobothrys arizonicus Arizona popcornflower Boraginaceae
Plagiobothrys collinus Cooper's popcornflower Boraginaceae
Plagiobothrys collinus var. fulvescens Cooper's popcornflower Boraginaceae
Plagiobothrys jonesii Mojave popcornflower Boraginaceae
Plagiobothrys pringlei Pringle's popcornflower Boraginaceae
Plagiobothrys scouleri Scouler's popcornflower Boraginaceae
Plagiobothrys scouleri var. hispidulus sleeping popcornflower Boraginaceae
Plagiobothrys tenellus Pacific popcornflower Boraginaceae
Plantago plantain Plantaginaceae
Plantago argyrea saltmeadow plantain Plantaginaceae
Plantago australis Mexican plantain Plantaginaceae
Plantago australis ssp. hirtella Mexican plantain Plantaginaceae
Plantago elongata prairie plantain Plantaginaceae
Plantago elongata ssp. elongata prairie plantain Plantaginaceae
Plantago eriopoda redwool plantain Plantaginaceae
Plantago lanceolata narrowleaf plantain Plantaginaceae
Plantago major common plantain Plantaginaceae
Plantago ovata desert Indianwheat Plantaginaceae
Plantago patagonica woolly plantain Plantaginaceae
Plantago rhodosperma redseed plantain Plantaginaceae
Plantago tweedyi Tweedy's plantain Plantaginaceae
Plantago virginica Virginia plantain Plantaginaceae
Plantago wrightiana Wright's plantain Plantaginaceae
Platanthera fringed orchid Orchidaceae
Platanthera aquilonis northern green orchid Orchidaceae
Platanthera dilatata scentbottle Orchidaceae
Platanthera dilatata var. leucostachys Sierra bog orchid Orchidaceae
Platanthera gracilis lax-flowered green orchid Orchidaceae
Platanthera limosa Thurber's bog orchid Orchidaceae
Platanthera purpurascens purple-petal bog orchid Orchidaceae
Platanthera sparsiflora sparse-flowered bog orchid Orchidaceae
Platanthera sparsiflora var. ensifolia sparse-flowered bog orchid Orchidaceae
Platanthera sparsiflora var. sparsiflora sparse-flowered bog orchid Orchidaceae
Platanthera stricta slender bog orchid Orchidaceae
Platanthera zothecina alcove bog orchid Orchidaceae
Platanus sycamore Platanaceae
Platanus wrightii Arizona sycamore Platanaceae
Platyschkuhria basindaisy Asteraceae
Platyschkuhria integrifolia basindaisy Asteraceae
Platyschkuhria integrifolia var. oblongifolia oblongleaf basindaisy Asteraceae
Platystemon creamcups Papaveraceae
Platystemon californicus creamcups Papaveraceae
Plectritis seablush Valerianaceae
Plectritis ciliosa longspur seablush Valerianaceae
Plectritis ciliosa ssp. ciliosa longspur seablush Valerianaceae
Plectritis ciliosa ssp. insignis longspur seablush Valerianaceae
Pleiacanthus Asteraceae
Pleiacanthus spinosus thorn skeletonweed Asteraceae
Pleopeltis scaly polypody Polypodiaceae
Pleopeltis riograndensis Rio Grande scaly polypody Polypodiaceae
Pleuraphis galleta grass Poaceae
Pleuraphis jamesii James' galleta Poaceae
Pleuraphis mutica tobosagrass Poaceae
Pleuraphis rigida big galleta Poaceae
Pleurocoronis pleurocoronis Asteraceae
Pleurocoronis pluriseta bush arrowleaf Asteraceae
Pluchea camphorweed Asteraceae
Pluchea odorata sweetscent Asteraceae
Pluchea odorata var. odorata sweetscent Asteraceae
Pluchea sericea arrowweed Asteraceae
Plumbago leadwort Plumbaginaceae
Plumbago scandens doctorbush Plumbaginaceae
Poa bluegrass Poaceae
Poa annua annual bluegrass Poaceae
Poa bigelovii Bigelow's bluegrass Poaceae
Poa bulbosa bulbous bluegrass Poaceae
Poa compressa Canada bluegrass Poaceae
Poa fendleriana muttongrass Poaceae
Poa fendleriana ssp. albescens muttongrass Poaceae
Poa fendleriana ssp. fendleriana muttongrass Poaceae
Poa fendleriana ssp. longiligula muttongrass Poaceae
Poa glauca glaucous bluegrass Poaceae
Poa glauca ssp. rupicola timberline bluegrass Poaceae
Poa leptocoma marsh bluegrass Poaceae
Poa nemoralis wood bluegrass Poaceae
Poa nemoralis ssp. interior inland bluegrass Poaceae
Poa occidentalis New Mexico bluegrass Poaceae
Poa palustris fowl bluegrass Poaceae
Poa pratensis Kentucky bluegrass Poaceae
Poa pratensis ssp. pratensis Kentucky bluegrass Poaceae
Poa reflexa nodding bluegrass Poaceae
Poa secunda Sandberg bluegrass Poaceae
Polanisia clammyweed Capparaceae
Polanisia dodecandra redwhisker clammyweed Capparaceae
Polanisia dodecandra ssp. dodecandra redwhisker clammyweed Capparaceae
Polanisia dodecandra ssp. trachysperma sandyseed clammyweed Capparaceae
Polemonium Jacob's-ladder Polemoniaceae
Polemonium foliosissimum towering Jacob's-ladder Polemoniaceae
Polemonium foliosissimum var. flavum yellow Jacob's-ladder Polemoniaceae
Polemonium foliosissimum var. foliosissimum towering Jacob's-ladder Polemoniaceae
Polemonium pauciflorum fewflower Jacob's-ladder Polemoniaceae
Polemonium pauciflorum ssp. hinckleyi Hinckley's polemonium Polemoniaceae
Polemonium pauciflorum ssp. pauciflorum fewflower Jacob's-ladder Polemoniaceae
Polemonium pulcherrimum Jacob's-ladder Polemoniaceae
Polemonium pulcherrimum ssp. delicatum Jacob's-ladder Polemoniaceae
Polemonium viscosum sticky polemonium Polemoniaceae
Poliomintha rosemary-mint Lamiaceae
Poliomintha incana frosted mint Lamiaceae
Polygala polygala Polygalaceae
Polygala acanthoclada desert polygala Polygalaceae
Polygala alba white milkwort Polygalaceae
Polygala barbeyana blue milkwort Polygalaceae
Polygala glochidiata tropical milkwort Polygalaceae
Polygala hemipterocarpa winged milkwort Polygalaceae
Polygala intermontana Intermountain milkwort Polygalaceae
Polygala lindheimeri shrubby milkwort Polygalaceae
Polygala lindheimeri var. parvifolia shrubby milkwort Polygalaceae
Polygala macradenia glandleaf milkwort Polygalaceae
Polygala obscura velvetseed milkwort Polygalaceae
Polygala piliophora Huachuca Mountain milkwort Polygalaceae
Polygala rusbyi Rusby's milkwort Polygalaceae
Polygala scoparioides broom milkwort Polygalaceae
Polygala subspinosa spiny milkwort Polygalaceae
Polygonatum Solomon's seal Liliaceae
Polygonatum cobrense McKittrick's Solomon's seal Liliaceae
Polygonum knotweed Polygonaceae
Polygonum amphibium water knotweed Polygonaceae
Polygonum amphibium var. emersum longroot smartweed Polygonaceae
Polygonum amphibium var. stipulaceum water smartweed Polygonaceae
Polygonum arenastrum oval-leaf knotweed Polygonaceae
Polygonum argyrocoleon silversheath knotweed Polygonaceae
Polygonum aviculare prostrate knotweed Polygonaceae
Polygonum bistortoides American bistort Polygonaceae
Polygonum buxiforme box knotweed Polygonaceae
Polygonum convolvulus black bindweed Polygonaceae
Polygonum convolvulus var. convolvulus black bindweed Polygonaceae
Polygonum douglasii Douglas' knotweed Polygonaceae
Polygonum douglasii ssp. douglasii Douglas' knotweed Polygonaceae
Polygonum douglasii ssp. johnstonii Johnston's knotweed Polygonaceae
Polygonum hydropiperoides swamp smartweed Polygonaceae
Polygonum lapathifolium curlytop knotweed Polygonaceae
Polygonum minimum broadleaf knotweed Polygonaceae
Polygonum pensylvanicum Pennsylvania smartweed Polygonaceae
Polygonum persicaria spotted ladysthumb Polygonaceae
Polygonum polygaloides milkwort knotweed Polygonaceae
Polygonum polygaloides ssp. confertiflorum fruitleaf knotweed Polygonaceae
Polygonum polygaloides ssp. kelloggii Kellogg's knotweed Polygonaceae
Polygonum punctatum dotted smartweed Polygonaceae
Polygonum punctatum var. confertiflorum dotted smartweed Polygonaceae
Polygonum ramosissimum bushy knotweed Polygonaceae
Polygonum ramosissimum var. ramosissimum bushy knotweed Polygonaceae
Polygonum viviparum alpine bistort Polygonaceae
Polypodium polypody Polypodiaceae
Polypodium glycyrrhiza licorice fern Polypodiaceae
Polypodium hesperium western polypody Polypodiaceae
Polypogon rabbitsfoot grass Poaceae
Polypogon australis Chilean rabbitsfoot grass Poaceae
Polypogon elongatus streambank rabbitsfoot grass Poaceae
Polypogon interruptus ditch rabbitsfoot grass Poaceae
Polypogon monspeliensis annual rabbitsfoot grass Poaceae
Polypogon viridis beardless rabbitsfoot grass Poaceae
Polystichum hollyfern Dryopteridaceae
Polystichum lonchitis northern hollyfern Dryopteridaceae
Polystichum scopulinum mountain hollyfern Dryopteridaceae
Pomaria Fabaceae
Pomaria jamesii James' holdback Fabaceae
Populus cottonwood Salicaceae
Populus acuminata lanceleaf cottonwood Salicaceae
Populus angustifolia narrowleaf cottonwood Salicaceae
Populus deltoides eastern cottonwood Salicaceae
Populus deltoides ssp. wislizeni Rio Grande cottonwood Salicaceae
Populus fremontii Fremont cottonwood Salicaceae
Populus fremontii ssp. fremontii Fremont cottonwood Salicaceae
Populus fremontii ssp. mesetae Fremont cottonwood Salicaceae
Populus hinckleyana Salicaceae
Populus nigra Lombardy poplar Salicaceae
Populus parryi Salicaceae
Populus tremuloides quaking aspen Salicaceae
Porophyllum poreleaf Asteraceae
Porophyllum gracile slender poreleaf Asteraceae
Porophyllum ruderale yerba porosa Asteraceae
Porophyllum ruderale ssp. macrocephalum yerba porosa Asteraceae
Porterella porterella Campanulaceae
Porterella carnosula fleshy porterella Campanulaceae
Portulaca purslane Portulacaceae
Portulaca halimoides silkcotton purslane Portulacaceae
Portulaca oleracea little hogweed Portulacaceae
Portulaca pilosa kiss me quick Portulacaceae
Portulaca suffrutescens shrubby purslane Portulacaceae
Portulaca umbraticola wingpod purslane Portulacaceae
Portulaca umbraticola ssp. umbraticola wingpod purslane Portulacaceae
Potamogeton pondweed Potamogetonaceae
Potamogeton crispus curly pondweed Potamogetonaceae
Potamogeton diversifolius waterthread pondweed Potamogetonaceae
Potamogeton foliosus leafy pondweed Potamogetonaceae
Potamogeton foliosus ssp. foliosus leafy pondweed Potamogetonaceae
Potamogeton gramineus variableleaf pondweed Potamogetonaceae
Potamogeton illinoensis Illinois pondweed Potamogetonaceae
Potamogeton natans floating pondweed Potamogetonaceae
Potamogeton nodosus longleaf pondweed Potamogetonaceae
Potamogeton pusillus small pondweed Potamogetonaceae
Potamogeton pusillus ssp. pusillus small pondweed Potamogetonaceae
Potamogeton pusillus ssp. tenuissimus small pondweed Potamogetonaceae
Potamogeton richardsonii Richardson's pondweed Potamogetonaceae
Potamogeton spathuliformis Potamogetonaceae
Potentilla cinquefoil Rosaceae
Potentilla albiflora whiteflower cinquefoil Rosaceae
Potentilla argentea silver cinquefoil Rosaceae
Potentilla argentea var. argentea silver cinquefoil Rosaceae
Potentilla arguta tall cinquefoil Rosaceae
Potentilla arguta ssp. convallaria cream cinquefoil Rosaceae
Potentilla biennis biennial cinquefoil Rosaceae
Potentilla concinna elegant cinquefoil Rosaceae
Potentilla concinna var. proxima elegant cinquefoil Rosaceae
Potentilla crinita bearded cinquefoil Rosaceae
Potentilla crinita var. crinita bearded cinquefoil Rosaceae
Potentilla crinita var. lemmonii Lemmon's cinquefoil Rosaceae
Potentilla diversifolia varileaf cinquefoil Rosaceae
Potentilla diversifolia var. diversifolia varileaf cinquefoil Rosaceae
Potentilla glandulosa sticky cinquefoil Rosaceae
Potentilla glandulosa ssp. arizonica Arizona cinquefoil Rosaceae
Potentilla glandulosa ssp. glabrata sticky cinquefoil Rosaceae
Potentilla gracilis slender cinquefoil Rosaceae
Potentilla gracilis var. fastigiata slender cinquefoil Rosaceae
Potentilla hippiana woolly cinquefoil Rosaceae
Potentilla hippiana var. hippiana woolly cinquefoil Rosaceae
Potentilla nivea snow cinquefoil Rosaceae
Potentilla nivea var. pentaphylla fiveleaf cinquefoil Rosaceae
Potentilla norvegica Norwegian cinquefoil Rosaceae
Potentilla norvegica ssp. monspeliensis Norwegian cinquefoil Rosaceae
Potentilla pectinisecta combleaf cinquefoil Rosaceae
Potentilla pensylvanica Pennsylvania cinquefoil Rosaceae
Potentilla pensylvanica var. pensylvanica Pennsylvania cinquefoil Rosaceae
Potentilla plattensis Platte River cinquefoil Rosaceae
Potentilla pulcherrima beautiful cinquefoil Rosaceae
Potentilla rivalis brook cinquefoil Rosaceae
Potentilla rubida Chihuahuan cinquefoil Rosaceae
Potentilla subviscosa Navajo cinquefoil Rosaceae
Potentilla subviscosa var. ramulosa Navajo cinquefoil Rosaceae
Potentilla subviscosa var. subviscosa Navajo cinquefoil Rosaceae
Potentilla thurberi scarlet cinquefoil Rosaceae
Potentilla thurberi var. atrorubens scarlet cinquefoil Rosaceae
Potentilla thurberi var. sanguinea scarlet cinquefoil Rosaceae
Potentilla thurberi var. thurberi scarlet cinquefoil Rosaceae
Potentilla wheeleri Kern cinquefoil Rosaceae
Prenanthella prenanthella Asteraceae
Prenanthella exigua brightwhite Asteraceae
Primula primrose Primulaceae
Primula parryi Parry's primrose Primulaceae
Primula rusbyi Rusby's primrose Primulaceae
Primula specuicola cavedwelling primrose Primulaceae
Proboscidea unicorn-plant Pedaliaceae
Proboscidea althaeifolia desert unicorn-plant Pedaliaceae
Proboscidea parviflora doubleclaw Pedaliaceae
Proboscidea parviflora ssp. parviflora unicorn plant, devil's claw Pedaliaceae
Proboscidea parviflora ssp. parviflora var. hohokamiana Pedaliaceae
Proboscidea parviflora ssp. parviflora var. parviflora doubleclaw Pedaliaceae
Prosartes Liliaceae
Prosartes trachycarpa roughfruit fairybells Liliaceae
Prosopis mesquite Fabaceae
Prosopis farcta Syrian mesquite Fabaceae
Prosopis glandulosa honey mesquite Fabaceae
Prosopis glandulosa var. torreyana western honey mesquite Fabaceae
Prosopis pubescens screwbean mesquite Fabaceae
Prosopis velutina velvet mesquite Fabaceae
Prunella selfheal Lamiaceae
Prunella vulgaris common selfheal Lamiaceae
Prunella vulgaris ssp. lanceolata lance selfheal Lamiaceae
Prunus plum Rosaceae
Prunus americana American plum Rosaceae
Prunus emarginata bitter cherry Rosaceae
Prunus emarginata var. emarginata bitter cherry Rosaceae
Prunus fasciculata desert almond Rosaceae
Prunus fasciculata var. fasciculata desert almond Rosaceae
Prunus persica peach Rosaceae
Prunus persica var. persica peach Rosaceae
Prunus serotina black cherry Rosaceae
Prunus serotina var. rufula black cherry Rosaceae
Prunus serotina var. virens black cherry Rosaceae
Prunus virginiana chokecherry Rosaceae
Prunus virginiana var. demissa western chokecherry Rosaceae
Psacalium Indianbush Asteraceae
Psacalium decompositum desert Indianbush Asteraceae
Psathyrostachys wildrye Poaceae
Psathyrostachys juncea Russian wildrye Poaceae
Psathyrotes turtleback Asteraceae
Psathyrotes annua annual psathyrotes Asteraceae
Psathyrotes pilifera hairybeast turtleback Asteraceae
Psathyrotes ramosissima velvet turtleback Asteraceae
Pseudelymus foxtail wheatgrass Poaceae
Pseudelymus saxicola foxtail wheatgrass Poaceae
Pseudocymopterus false springparsley Apiaceae
Pseudocymopterus montanus alpine false springparsley Apiaceae
Pseudognaphalium cudweed Asteraceae
Pseudognaphalium arizonicum Arizona cudweed Asteraceae
Pseudognaphalium canescens Wright's cudweed Asteraceae
Pseudognaphalium canescens ssp. canescens Wright's cudweed Asteraceae
Pseudognaphalium jaliscense Jalisco rabbit-tobacco Asteraceae
Pseudognaphalium leucocephalum white cudweed Asteraceae
Pseudognaphalium luteoalbum Jersey cudweed Asteraceae
Pseudognaphalium macounii Macoun's cudweed Asteraceae
Pseudognaphalium pringlei Pringle's cudweed Asteraceae
Pseudognaphalium stramineum cottonbatting plant Asteraceae
Pseudoroegneria wheatgrass Poaceae
Pseudoroegneria spicata bluebunch wheatgrass Poaceae
Pseudoroegneria spicata ssp. spicata bluebunch wheatgrass Poaceae
Pseudorontium pseudorontium Scrophulariaceae
Pseudorontium cyathiferum dog's-mouth Scrophulariaceae
Pseudostellaria pseudostellaria Caryophyllaceae
Pseudostellaria jamesiana tuber starwort Caryophyllaceae
Pseudotsuga Douglas-fir Pinaceae
Pseudotsuga menziesii Douglas-fir Pinaceae
Pseudotsuga menziesii var. glauca Rocky Mountain Douglas-fir Pinaceae
Psilactis tansyaster Asteraceae
Psilactis asteroides New Mexico tansyaster Asteraceae
Psilactis gentryi Mexican tansyaster Asteraceae
Psilostrophe paperflower Asteraceae
Psilostrophe cooperi whitestem paperflower Asteraceae
Psilostrophe sparsiflora greenstem paperflower Asteraceae
Psilostrophe tagetina woolly paperflower Asteraceae
Psilostrophe tagetina var. tagetina woolly paperflower Asteraceae
Psilotum whisk fern Psilotaceae
Psilotum nudum whisk fern Psilotaceae
Psoralidium scurfpea Fabaceae
Psoralidium junceum rush lemonweed Fabaceae
Psoralidium lanceolatum lemon scurfpea Fabaceae
Psoralidium tenuiflorum slimflower scurfpea Fabaceae
Psorothamnus dalea Fabaceae
Psorothamnus arborescens Mojave indigobush Fabaceae
Psorothamnus arborescens var. pubescens Mojave indigobush Fabaceae
Psorothamnus emoryi dyebush Fabaceae
Psorothamnus fremontii Fremont's dalea Fabaceae
Psorothamnus fremontii var. attenuatus Fremont's dalea Fabaceae
Psorothamnus fremontii var. fremontii Fremont's dalea Fabaceae
Psorothamnus schottii Schott's dalea Fabaceae
Psorothamnus scoparius broom dalea Fabaceae
Psorothamnus spinosus smoketree Fabaceae
Psorothamnus thompsoniae Thompson's dalea Fabaceae
Psorothamnus thompsoniae var. whitingii Whiting's dalea Fabaceae
Ptelea hoptree Rutaceae
Ptelea trifoliata common hoptree Rutaceae
Ptelea trifoliata ssp. pallida pallid hoptree Rutaceae
Ptelea trifoliata ssp. pallida var. cognata pallid hoptree Rutaceae
Ptelea trifoliata ssp. pallida var. lutescens pallid hoptree Rutaceae
Ptelea trifoliata ssp. pallida var. pallida pallid hoptree Rutaceae
Ptelea trifoliata ssp. polyadenia pallid hoptree Rutaceae
Pteridium brackenfern Dennstaedtiaceae
Pteridium aquilinum western brackenfern Dennstaedtiaceae
Pteridium aquilinum var. pubescens hairy brackenfern Dennstaedtiaceae
Pterospora pinedrops Monotropaceae
Pterospora andromedea woodland pinedrops Monotropaceae
Pterostegia pterostegia Polygonaceae
Pterostegia drymarioides woodland pterostegia Polygonaceae
Pteryxia wavewing Apiaceae
Pteryxia davidsonii Davidson's wavewing Apiaceae
Pteryxia petraea rockloving wavewing Apiaceae
Puccinellia alkaligrass Poaceae
Puccinellia distans weeping alkaligrass Poaceae
Puccinellia distans ssp. distans weeping alkaligrass Poaceae
Puccinellia fasciculata saltmarsh alkaligrass Poaceae
Puccinellia nuttalliana Nuttall's alkaligrass Poaceae
Puccinellia parishii bog alkaligrass Poaceae
Purshia bitterbrush Rosaceae
Purshia glandulosa desert bitterbrush Rosaceae
Purshia mexicana Mexican cliffrose Rosaceae
Purshia pinkavae Pinkava's cliffrose Rosaceae
Purshia stansburiana Stansbury cliffrose Rosaceae
Purshia subintegra Rosaceae
Purshia tridentata antelope bitterbrush Rosaceae
Pyracantha firethorn Rosaceae
Pyracantha koidzumii Formosa firethorn Rosaceae
Pyrola wintergreen Pyrolaceae
Pyrola chlorantha greenflowered wintergreen Pyrolaceae
Pyrola elliptica waxflower shinleaf Pyrolaceae
Pyrola minor snowline wintergreen Pyrolaceae
Pyrola picta whiteveined wintergreen Pyrolaceae
Pyrrhopappus desert-chicory Asteraceae
Pyrrhopappus pauciflorus smallflower desert-chicory Asteraceae
Pyrrocoma goldenweed Asteraceae
Pyrrocoma crocea curlyhead goldenweed Asteraceae
Pyrrocoma crocea var. genuflexa curlyhead goldenweed Asteraceae
Q
Quercus oak Fagaceae
Quercus ajoensis Ajo Mountain scrub oak Fagaceae
Quercus arizonica Arizona white oak Fagaceae
Quercus chrysolepis canyon live oak Fagaceae
Quercus chrysolepis var. chrysolepis canyon live oak Fagaceae
Quercus emoryi Emory oak Fagaceae
Quercus gambelii Gambel oak Fagaceae
Quercus gambelii var. gambelii Gambel oak Fagaceae
Quercus grisea gray oak Fagaceae
Quercus havardii Havard oak Fagaceae
Quercus havardii var. havardii Havard oak Fagaceae
Quercus hypoleucoides silverleaf oak Fagaceae
Quercus oblongifolia Mexican blue oak Fagaceae
Quercus organensis Fagaceae
Quercus palmeri Palmer oak Fagaceae
Quercus pauciloba Fagaceae
Quercus pungens pungent oak Fagaceae
Quercus rugosa netleaf oak Fagaceae
Quercus toumeyi Toumey oak Fagaceae
Quercus turbinella Sonoran scrub oak Fagaceae
Quercus viminea Sonoran oak Fagaceae
Quincula quincula Solanaceae
Quincula lobata Chinese lantern Solanaceae
R
Rafinesquia plumeseed Asteraceae
Rafinesquia californica California plumeseed Asteraceae
Rafinesquia neomexicana New Mexico plumeseed Asteraceae
Ranunculus buttercup Ranunculaceae
Ranunculus andersonii Anderson's buttercup Ranunculaceae
Ranunculus andersonii var. tenellus Anderson's buttercup Ranunculaceae
Ranunculus arizonicus Arizona buttercup Ranunculaceae
Ranunculus cardiophyllus heartleaf buttercup Ranunculaceae
Ranunculus cymbalaria alkali buttercup Ranunculaceae
Ranunculus eschscholtzii Eschscholtz's buttercup Ranunculaceae
Ranunculus eschscholtzii var. eschscholtzii Eschscholtz's buttercup Ranunculaceae
Ranunculus eximius tundra buttercup Ranunculaceae
Ranunculus flammula greater creeping spearwort Ranunculaceae
Ranunculus flammula var. flammula greater creeping spearwort Ranunculaceae
Ranunculus glaberrimus sagebrush buttercup Ranunculaceae
Ranunculus glaberrimus var. ellipticus elliptical buttercup Ranunculaceae
Ranunculus hebecarpus delicate buttercup Ranunculaceae
Ranunculus hydrocharoides frogbit buttercup Ranunculaceae
Ranunculus hydrocharoides var. hydrocharoides frogbit buttercup Ranunculaceae
Ranunculus hydrocharoides var. stolonifer frogbit buttercup Ranunculaceae
Ranunculus inamoenus graceful buttercup Ranunculaceae
Ranunculus inamoenus var. alpeophilus graceful buttercup Ranunculaceae
Ranunculus inamoenus var. inamoenus graceful buttercup Ranunculaceae
Ranunculus inamoenus var. subaffinis graceful buttercup Ranunculaceae
Ranunculus longirostris longbeak buttercup Ranunculaceae
Ranunculus macounii Macoun's buttercup Ranunculaceae
Ranunculus macranthus large buttercup Ranunculaceae
Ranunculus oreogenes Oregon buttercup Ranunculaceae
Ranunculus pedatifidus surefoot buttercup Ranunculaceae
Ranunculus pedatifidus var. affinis northern buttercup Ranunculaceae
Ranunculus pensylvanicus Pennsylvania buttercup Ranunculaceae
Ranunculus petiolaris Latin American buttercup Ranunculaceae
Ranunculus petiolaris var. arsenei Arsene's buttercup Ranunculaceae
Ranunculus sceleratus cursed buttercup Ranunculaceae
Ranunculus sceleratus var. multifidus cursed buttercup Ranunculaceae
Ranunculus trichophyllus threadleaf crowfoot Ranunculaceae
Ranunculus trichophyllus var. trichophyllus threadleaf crowfoot Ranunculaceae
Ranunculus uncinatus woodland buttercup Ranunculaceae
Ranunculus uncinatus var. uncinatus woodland buttercup Ranunculaceae
Raphanus radish Brassicaceae
Raphanus raphanistrum wild radish Brassicaceae
Raphanus sativus cultivated radish Brassicaceae
Ratibida prairie coneflower Asteraceae
Ratibida columnifera upright prairie coneflower Asteraceae
Ratibida tagetes green prairie coneflower Asteraceae
Redfieldia blowout grass Poaceae
Redfieldia flexuosa blowout grass Poaceae
Reverchonia reverchonia Euphorbiaceae
Reverchonia arenaria sand reverchonia Euphorbiaceae
Rhamnus buckthorn Rhamnaceae
Rhamnus crocea redberry buckthorn Rhamnaceae
Rhamnus crocea ssp. crocea redberry buckthorn Rhamnaceae
Rhamnus crocea ssp. pilosa hollyleaf buckthorn Rhamnaceae
Rhamnus ilicifolia hollyleaf redberry Rhamnaceae
Rhamnus serrata sawleaf buckthorn Rhamnaceae
Rhinanthus yellow rattle Scrophulariaceae
Rhinanthus minor little yellow rattle Scrophulariaceae
Rhinanthus minor ssp. minor little yellow rattle Scrophulariaceae
Rhodiola stonecrop Crassulaceae
Rhodiola rhodantha redpod stonecrop Crassulaceae
Rhus sumac Anacardiaceae
Rhus glabra smooth sumac Anacardiaceae
Rhus kearneyi Kearney's sumac Anacardiaceae
Rhus lanceolata prairie sumac Anacardiaceae
Rhus microphylla littleleaf sumac Anacardiaceae
Rhus ovata sugar sumac Anacardiaceae
Rhus trilobata skunkbush sumac Anacardiaceae
Rhus trilobata var. anisophylla skunkbush sumac Anacardiaceae
Rhus trilobata var. pilosissima pubescent skunkbush sumac Anacardiaceae
Rhus trilobata var. quinata skunkbush sumac Anacardiaceae
Rhus trilobata var. racemulosa skunkbush sumac Anacardiaceae
Rhus trilobata var. simplicifolia skunkbush sumac Anacardiaceae
Rhus trilobata var. trilobata skunkbush sumac Anacardiaceae
Rhus virens evergreen sumac Anacardiaceae
Rhus virens var. choriophylla evergreen sumac Anacardiaceae
Rhynchosia snoutbean Fabaceae
Rhynchosia edulis Chihuahuan snoutbean Fabaceae
Rhynchosia precatoria rosary snoutbean Fabaceae
Rhynchosia senna Texas snoutbean Fabaceae
Rhynchosia senna var. texana Texas snoutbean Fabaceae
Rhynchosida rhynchosida Malvaceae
Rhynchosida physocalyx buffpetal Malvaceae
Ribes currant Grossulariaceae
Ribes aureum golden currant Grossulariaceae
Ribes aureum var. aureum golden currant Grossulariaceae
Ribes cereum wax currant Grossulariaceae
Ribes cereum var. cereum wax currant Grossulariaceae
Ribes cereum var. pedicellare whisky currant Grossulariaceae
Ribes inerme whitestem gooseberry Grossulariaceae
Ribes inerme var. inerme whitestem gooseberry Grossulariaceae
Ribes leptanthum trumpet gooseberry Grossulariaceae
Ribes montigenum gooseberry currant Grossulariaceae
Ribes pinetorum orange gooseberry Grossulariaceae
Ribes quercetorum rock gooseberry Grossulariaceae
Ribes velutinum desert gooseberry Grossulariaceae
Ribes velutinum var. velutinum desert gooseberry Grossulariaceae
Ribes viscosissimum sticky currant Grossulariaceae
Ribes wolfii Wolf's currant Grossulariaceae
Ricinus ricinus Euphorbiaceae
Ricinus communis castorbean Euphorbiaceae
Rivina rivina Phytolaccaceae
Rivina humilis rougeplant Phytolaccaceae
Robinia locust Fabaceae
Robinia neomexicana New Mexico locust Fabaceae
Robinia neomexicana var. neomexicana New Mexico locust Fabaceae
Robinia neomexicana var. rusbyi Rusby's locust Fabaceae
Robinia pseudoacacia black locust Fabaceae
Roldana groundsel Asteraceae
Roldana hartwegii Hartweg's groundsel Asteraceae
Rorippa yellowcress Brassicaceae
Rorippa curvipes bluntleaf yellowcress Brassicaceae
Rorippa curvipes var. curvipes bluntleaf yellowcress Brassicaceae
Rorippa curvipes var. truncata bluntleaf yellowcress Brassicaceae
Rorippa curvisiliqua curvepod yellowcress Brassicaceae
Rorippa curvisiliqua var. orientalis Oriental yellowcress Brassicaceae
Rorippa microtitis Chihuahuan yellowcress Brassicaceae
Rorippa palustris bog yellowcress Brassicaceae
Rorippa palustris ssp. fernaldiana Fernald's yellowcress Brassicaceae
Rorippa palustris ssp. occidentalis western bog yellowcress Brassicaceae
Rorippa sinuata spreading yellowcress Brassicaceae
Rorippa sphaerocarpa roundfruit yellowcress Brassicaceae
Rorippa sylvestris creeping yellowcress Brassicaceae
Rosa rose Rosaceae
Rosa stellata desert rose Rosaceae
Rosa stellata ssp. abyssa desert rose Rosaceae
Rosa stellata ssp. stellata desert rose Rosaceae
Rosa woodsii Woods' rose Rosaceae
Rosa woodsii var. woodsii Woods' rose Rosaceae
Rostraria hairgrass Poaceae
Rostraria cristata Mediterranean hairgrass Poaceae
Rotala rotala Lythraceae
Rotala ramosior lowland rotala Lythraceae
Rubus blackberry Rosaceae
Rubus arizonensis Arizona dewberry Rosaceae
Rubus armeniacus Himalayan blackberry Rosaceae
Rubus idaeus American red raspberry Rosaceae
Rubus idaeus ssp. strigosus grayleaf red raspberry Rosaceae
Rubus leucodermis whitebark raspberry Rosaceae
Rubus leucodermis var. leucodermis whitebark raspberry Rosaceae
Rubus neomexicanus New Mexico raspberry Rosaceae
Rubus parviflorus thimbleberry Rosaceae
Rubus parviflorus var. parviflorus thimbleberry Rosaceae
Rudbeckia coneflower Asteraceae
Rudbeckia laciniata cutleaf coneflower Asteraceae
Rudbeckia laciniata var. ampla cutleaf coneflower Asteraceae
Rudbeckia laciniata var. laciniata cutleaf coneflower Asteraceae
Ruellia wild petunia Acanthaceae
Ruellia nudiflora violet wild petunia Acanthaceae
Ruellia nudiflora var. nudiflora violet wild petunia Acanthaceae
Rumex dock Polygonaceae
Rumex acetosella common sheep sorrel Polygonaceae
Rumex altissimus pale dock Polygonaceae
Rumex aquaticus western dock Polygonaceae
Rumex aquaticus var. fenestratus western dock Polygonaceae
Rumex conglomeratus clustered dock Polygonaceae
Rumex crispus curly dock Polygonaceae
Rumex crispus ssp. crispus curly dock Polygonaceae
Rumex densiflorus denseflowered dock Polygonaceae
Rumex dentatus toothed dock Polygonaceae
Rumex hymenosepalus canaigre dock Polygonaceae
Rumex maritimus golden dock Polygonaceae
Rumex nematopodus Arizona dock Polygonaceae
Rumex obtusifolius bitter dock Polygonaceae
Rumex orthoneurus Chiricahua Mountain dock Polygonaceae
Rumex salicifolius willow dock Polygonaceae
Rumex salicifolius var. denticulatus toothed willow dock Polygonaceae
Rumex salicifolius var. mexicanus Mexican dock Polygonaceae
Rumex stenophyllus narrowleaf dock Polygonaceae
Rumex violascens violet dock Polygonaceae
Ruppia widgeonweed Ruppiaceae
Ruppia cirrhosa spiral ditchgrass Ruppiaceae
S
Saccharum sugarcane Poaceae
Saccharum ravennae ravennagrass Poaceae
Sageretia mock buckthorn Rhamnaceae
Sageretia wrightii Wright's mock buckthorn Rhamnaceae
Sagina pearlwort Caryophyllaceae
Sagina decumbens trailing pearlwort Caryophyllaceae
Sagina decumbens ssp. decumbens trailing pearlwort Caryophyllaceae
Sagina decumbens ssp. occidentalis western pearlwort Caryophyllaceae
Sagina saginoides arctic pearlwort Caryophyllaceae
Sagittaria arrowhead Alismataceae
Sagittaria calycina hooded arrowhead Alismataceae
Sagittaria calycina var. calycina hooded arrowhead Alismataceae
Sagittaria cuneata arumleaf arrowhead Alismataceae
Sagittaria graminea grassy arrowhead Alismataceae
Sagittaria graminea var. graminea grassy arrowhead Alismataceae
Sagittaria latifolia broadleaf arrowhead Alismataceae
Sagittaria longiloba longbarb arrowhead Alismataceae
Sairocarpus snapdragon Scrophulariaceae
Sairocarpus kingii least snapdragon Scrophulariaceae
Sairocarpus nuttallianus violet snapdragon Scrophulariaceae
Sairocarpus watsonii Watson's snapdragon Scrophulariaceae
Salazaria bladdersage Lamiaceae
Salazaria mexicana Mexican bladdersage Lamiaceae
Salix willow Salicaceae
Salix alba white willow Salicaceae
Salix amygdaloides peachleaf willow Salicaceae
Salix arizonica Arizona willow Salicaceae
Salix bebbiana Bebb willow Salicaceae
Salix bonplandiana Bonpland willow Salicaceae
Salix boothii Booth's willow Salicaceae
Salix exigua narrowleaf willow Salicaceae
Salix geyeriana Geyer willow Salicaceae
Salix gooddingii Goodding's willow Salicaceae
Salix irrorata dewystem willow Salicaceae
Salix laevigata red willow Salicaceae
Salix lasiolepis arroyo willow Salicaceae
Salix lasiolepis var. lasiolepis arroyo willow Salicaceae
Salix ligulifolia strapleaf willow Salicaceae
Salix lucida shining willow Salicaceae
Salix lucida ssp. lasiandra Pacific willow Salicaceae
Salix lutea yellow willow Salicaceae
Salix monticola park willow Salicaceae
Salix planifolia diamondleaf willow Salicaceae
Salix planifolia ssp. planifolia diamondleaf willow Salicaceae
Salix rubens hybrid crack willow Salicaceae
Salix scouleriana Scouler's willow Salicaceae
Salix sepulcralis weeping willow Salicaceae
Salix taxifolia yewleaf willow Salicaceae
Salpichroa salpichroa Solanaceae
Salpichroa origanifolia lily of the valley vine Solanaceae
Salsola Russian thistle Chenopodiaceae
Salsola collina slender Russian thistle Chenopodiaceae
Salsola paulsenii barbwire Russian thistle Chenopodiaceae
Salsola tragus prickly Russian thistle Chenopodiaceae
Salvia sage Lamiaceae
Salvia aethiopis Mediterranean sage Lamiaceae
Salvia amissa Santa Catalina Mountain sage Lamiaceae
Salvia arizonica desert indigo sage Lamiaceae
Salvia columbariae chia Lamiaceae
Salvia columbariae var. columbariae chia Lamiaceae
Salvia davidsonii Davidson's sage Lamiaceae
Salvia dorrii purple sage Lamiaceae
Salvia dorrii ssp. dorrii purple sage Lamiaceae
Salvia dorrii ssp. dorrii var. dorrii purple sage Lamiaceae
Salvia dorrii ssp. dorrii var. pilosa purple sage Lamiaceae
Salvia dorrii ssp. mearnsii purple sage Lamiaceae
Salvia henryi crimson sage Lamiaceae
Salvia lemmonii Lemmon's sage Lamiaceae
Salvia microphylla baby sage Lamiaceae
Salvia mohavensis Mojave sage Lamiaceae
Salvia pachyphylla blue sage Lamiaceae
Salvia parryi Parry's sage Lamiaceae
Salvia pinguifolia rock sage Lamiaceae
Salvia reflexa lanceleaf sage Lamiaceae
Salvia subincisa sawtooth sage Lamiaceae
Salvia tiliifolia lindenleaf sage Lamiaceae
Salvinia watermoss Salviniaceae
Salvinia molesta kariba-weed Salviniaceae
Sambucus elderberry Caprifoliaceae
Sambucus nigra black elderberry Caprifoliaceae
Sambucus nigra ssp. canadensis American black elderberry Caprifoliaceae
Sambucus nigra ssp. cerulea blue elderberry Caprifoliaceae
Sambucus racemosa red elderberry Caprifoliaceae
Sambucus racemosa var. melanocarpa Rocky Mountain elder Caprifoliaceae
Sambucus racemosa var. racemosa red elderberry Caprifoliaceae
Samolus brookweed Primulaceae
Samolus vagans Chiricahua Mountain brookweed Primulaceae
Samolus valerandi seaside brookweed Primulaceae
Samolus valerandi ssp. parviflorus seaside brookweed Primulaceae
Sanguisorba burnet Rosaceae
Sanguisorba annua prairie burnet Rosaceae
Sanguisorba minor small burnet Rosaceae
Sanguisorba minor ssp. balearica small burnet Rosaceae
Sanvitalia creeping zinnia Asteraceae
Sanvitalia abertii Abert's creeping zinnia Asteraceae
Sapindus soapberry Sapindaceae
Sapindus saponaria wingleaf soapberry Sapindaceae
Sapindus saponaria var. drummondii western soapberry Sapindaceae
Saponaria soapwort Caryophyllaceae
Saponaria officinalis bouncingbet Caryophyllaceae
Sarcobatus greasewood Chenopodiaceae
Sarcobatus vermiculatus greasewood Chenopodiaceae
Sarcocornia swampfire Chenopodiaceae
Sarcocornia utahensis Utah swampfire Chenopodiaceae
Saxifraga saxifrage Saxifragaceae
Saxifraga caespitosa tufted alpine saxifrage Saxifragaceae
Saxifraga caespitosa ssp. caespitosa tufted alpine saxifrage Saxifragaceae
Saxifraga caespitosa ssp. monticola tufted alpine saxifrage Saxifragaceae
Saxifraga eriophora redfuzz saxifrage Saxifragaceae
Saxifraga flagellaris whiplash saxifrage Saxifragaceae
Saxifraga flagellaris ssp. crandallii Crandall's saxifrage Saxifragaceae
Saxifraga odontoloma brook saxifrage Saxifragaceae
Saxifraga rhomboidea diamondleaf saxifrage Saxifragaceae
Saxifraga rivularis weak saxifrage Saxifragaceae
Scabrethia Asteraceae
Scabrethia scabra badlands mule-ears Asteraceae
Scabrethia scabra ssp. attenuata badlands mule-ears Asteraceae
Scabrethia scabra ssp. canescens badlands mule-ears Asteraceae
Scabrethia scabra ssp. scabra badlands mule-ears Asteraceae
Scandix scandix Apiaceae
Scandix pecten-veneris shepherdsneedle Apiaceae
Schedonnardus tumblegrass Poaceae
Schedonnardus paniculatus tumblegrass Poaceae
Schedonorus Poaceae
Schedonorus phoenix tall fescue Poaceae
Schedonorus pratensis meadow fescue Poaceae
Schiedeella Orchidaceae
Schiedeella arizonica parasitic lady's tresses Orchidaceae
Schismus Mediterranean grass Poaceae
Schismus arabicus Arabian schismus Poaceae
Schismus barbatus common Mediterranean grass Poaceae
Schistophragma schistophragma Scrophulariaceae
Schistophragma intermedia harlequin spiralseed Scrophulariaceae
Schizachyrium little bluestem Poaceae
Schizachyrium cirratum Texas bluestem Poaceae
Schizachyrium sanguineum crimson bluestem Poaceae
Schizachyrium sanguineum var. hirtiflorum crimson bluestem Poaceae
Schizachyrium scoparium little bluestem Poaceae
Schizachyrium scoparium var. scoparium little bluestem Poaceae
Schkuhria false threadleaf Asteraceae
Schkuhria anthemoidea Wright's false threadleaf Asteraceae
Schkuhria anthemoidea var. wrightii Wright's false threadleaf Asteraceae
Schkuhria multiflora manyflower false threadleaf Asteraceae
Schkuhria pinnata pinnate false threadleaf Asteraceae
Schkuhria pinnata var. guatemalensis Wislizenus' false threadleaf Asteraceae
Schoenocrambe plainsmustard Brassicaceae
Schoenocrambe linearifolia slimleaf plainsmustard Brassicaceae
Schoenoplectus bulrush Cyperaceae
Schoenoplectus acutus hardstem bulrush Cyperaceae
Schoenoplectus acutus var. occidentalis tule Cyperaceae
Schoenoplectus americanus chairmaker's bulrush Cyperaceae
Schoenoplectus californicus California bulrush Cyperaceae
Schoenoplectus fluviatilis river bulrush Cyperaceae
Schoenoplectus maritimus cosmopolitan bulrush Cyperaceae
Schoenoplectus pungens common threesquare Cyperaceae
Schoenoplectus pungens var. longispicatus common threesquare Cyperaceae
Schoenoplectus tabernaemontani softstem bulrush Cyperaceae
Scirpus bulrush Cyperaceae
Scirpus atrovirens green bulrush Cyperaceae
Scirpus microcarpus panicled bulrush Cyperaceae
Scirpus pallidus cloaked bulrush Cyperaceae
Scirpus pendulus rufous bulrush Cyperaceae
Sclerocactus fishhook cactus Cactaceae
Sclerocactus papyracanthus paperspine fishhook cactus Cactaceae
Sclerocactus parviflorus smallflower fishhook cactus Cactaceae
Sclerocactus parviflorus ssp. havasupaiensis Cactaceae
Sclerocactus parviflorus ssp. intermedius intermediate fishhook cactus Cactaceae
Sclerocactus parviflorus ssp. parviflorus smallflower fishhook cactus Cactaceae
Sclerocactus parviflorus ssp. terrae-canyonae longspine fishhook cactus Cactaceae
Sclerocactus sileri Siler's pincushion cactus Cactaceae
Sclerocactus whipplei Whipple's fishhook cactus Cactaceae
Sclerochloa hardgrass Poaceae
Sclerochloa dura common hardgrass Poaceae
Scleropogon burrograss Poaceae
Scleropogon brevifolius burrograss Poaceae
Scrophularia figwort Scrophulariaceae
Scrophularia parviflora pineland figwort Scrophulariaceae
Scutellaria skullcap Lamiaceae
Scutellaria drummondii Drummond's skullcap Lamiaceae
Scutellaria drummondii var. edwardsiana Drummond's skullcap Lamiaceae
Scutellaria galericulata marsh skullcap Lamiaceae
Scutellaria lateriflora blue skullcap Lamiaceae
Scutellaria lateriflora var. lateriflora blue skullcap Lamiaceae
Scutellaria potosina Mexican skullcap Lamiaceae
Scutellaria potosina ssp. platyphylla Mexican skullcap Lamiaceae
Scutellaria potosina ssp. platyphylla var. platyphylla Mexican skullcap Lamiaceae
Scutellaria potosina ssp. potosina Mexican skullcap Lamiaceae
Scutellaria potosina ssp. potosina var. grahamiana Mexican skullcap Lamiaceae
Scutellaria potosina ssp. potosina var. tessellata Mexican skullcap Lamiaceae
Sebastiania Sebastian-bush Euphorbiaceae
Sebastiania bilocularis arrow poision plant Euphorbiaceae
Secale rye Poaceae
Secale cereale cereal rye Poaceae
Securigera Fabaceae
Securigera varia crownvetch Fabaceae
Sedum stonecrop Crassulaceae
Sedum cockerellii Cockerell's stonecrop Crassulaceae
Sedum lanceolatum spearleaf stonecrop Crassulaceae
Sedum lanceolatum ssp. lanceolatum spearleaf stonecrop Crassulaceae
Sedum stelliforme Huachuca Mountain stonecrop Crassulaceae
Selaginella spikemoss Selaginellaceae
Selaginella arizonica Arizona spikemoss Selaginellaceae
Selaginella densa lesser spikemoss Selaginellaceae
Selaginella densa var. densa lesser spikemoss Selaginellaceae
Selaginella densa var. scopulorum Rocky Mountain spikemoss Selaginellaceae
Selaginella eremophila desert spikemoss Selaginellaceae
Selaginella leucobryoides Mojave spikemoss Selaginellaceae
Selaginella mutica bluntleaf spikemoss Selaginellaceae
Selaginella mutica var. limitanea bluntleaf spikemoss Selaginellaceae
Selaginella mutica var. mutica bluntleaf spikemoss Selaginellaceae
Selaginella neomexicana Selaginellaceae
Selaginella rupincola rockloving spikemoss Selaginellaceae
Selaginella underwoodii Underwood's spikemoss Selaginellaceae
Selaginella watsonii Watson's spikemoss Selaginellaceae
Selinocarpus moonpod Nyctaginaceae
Selinocarpus nevadensis desert moonpod Nyctaginaceae
Senecio ragwort Asteraceae
Senecio actinella Flagstaff ragwort Asteraceae
Senecio arizonicus Arizona ragwort Asteraceae
Senecio bigelovii nodding ragwort Asteraceae
Senecio bigelovii var. bigelovii nodding ragwort Asteraceae
Senecio bigelovii var. hallii Hall's ragwort Asteraceae
Senecio eremophilus desert ragwort Asteraceae
Senecio eremophilus var. kingii King's ragwort Asteraceae
Senecio eremophilus var. macdougalii MacDougal's ragwort Asteraceae
Senecio flaccidus threadleaf ragwort Asteraceae
Senecio flaccidus var. flaccidus threadleaf ragwort Asteraceae
Senecio flaccidus var. monoensis smooth threadleaf ragwort Asteraceae
Senecio lemmonii Lemmon's ragwort Asteraceae
Senecio mohavensis Mojave ragwort Asteraceae
Senecio multidentatus Huachuca Mountain ragwort Asteraceae
Senecio multidentatus var. huachucanus Huachuca Mountain ragwort Asteraceae
Senecio parryi mountain ragwort Asteraceae
Senecio riddellii Riddell's ragwort Asteraceae
Senecio spartioides broom-like ragwort Asteraceae
Senecio spartioides var. multicapitatus broom-like ragwort Asteraceae
Senecio spartioides var. spartioides broom-like ragwort Asteraceae
Senecio vulgaris old-man-in-the-Spring Asteraceae
Senecio wootonii Wooton's ragwort Asteraceae
Senna senna Fabaceae
Senna armata desertsenna Fabaceae
Senna artemisioides silver senna Fabaceae
Senna bauhinioides twinleaf senna Fabaceae
Senna covesii Coues' cassia Fabaceae
Senna didymobotrya African senna Fabaceae
Senna hirsuta woolly senna Fabaceae
Senna hirsuta var. glaberrima woolly senna Fabaceae
Senna lindheimeriana velvet leaf senna Fabaceae
Senna pendula valamuerto Fabaceae
Senna pendula var. glabrata valamuerto Fabaceae
Senna wislizeni Wislizenus' senna Fabaceae
Sesbania riverhemp Fabaceae
Sesbania herbacea bigpod sesbania Fabaceae
Sesuvium seapurslane Aizoaceae
Sesuvium verrucosum verrucose seapurslane Aizoaceae
Setaria bristlegrass Poaceae
Setaria adhaerens bur bristlegrass Poaceae
Setaria arizonica Arizona bristlegrass Poaceae
Setaria faberi Japanese bristlegrass Poaceae
Setaria grisebachii Grisebach's bristlegrass Poaceae
Setaria italica foxtail bristlegrass Poaceae
Setaria leucopila streambed bristlegrass Poaceae
Setaria liebmannii Liebmann's bristlegrass Poaceae
Setaria macrostachya large-spike bristlegrass Poaceae
Setaria parviflora marsh bristlegrass Poaceae
Setaria pumila yellow foxtail Poaceae
Setaria pumila ssp. pumila yellow foxtail Poaceae
Setaria scheelei southwestern bristlegrass Poaceae
Setaria verticillata hooked bristlegrass Poaceae
Setaria villosissima hairyleaf bristlegrass Poaceae
Setaria viridis green bristlegrass Poaceae
Setaria viridis var. viridis green bristlegrass Poaceae
Setaria vulpiseta plains bristlegrass Poaceae
Setariopsis Poaceae
Setariopsis auriculata Poaceae
Seymeria blacksenna Scrophulariaceae
Seymeria bipinnatisecta Eagle Pass blacksenna Scrophulariaceae
Shepherdia buffaloberry Elaeagnaceae
Shepherdia argentea silver buffaloberry Elaeagnaceae
Shepherdia canadensis russet buffaloberry Elaeagnaceae
Shepherdia rotundifolia roundleaf buffaloberry Elaeagnaceae
Sherardia sherardia Rubiaceae
Sherardia arvensis blue fieldmadder Rubiaceae
Sibbaldia sibbaldia Rosaceae
Sibbaldia procumbens creeping sibbaldia Rosaceae
Sicyos bur cucumber Cucurbitaceae
Sicyos ampelophyllus streamside bur cucumber Cucurbitaceae
Sicyos laciniatus cutleaf bur cucumber Cucurbitaceae
Sicyosperma sicyosperma Cucurbitaceae
Sicyosperma gracile climbing arrowheads Cucurbitaceae
Sida fanpetals Malvaceae
Sida abutifolia spreading fanpetals Malvaceae
Sida neomexicana New Mexico fanpetals Malvaceae
Sida rhombifolia Cuban jute Malvaceae
Sida spinosa prickly fanpetals Malvaceae
Sida tragiifolia earleaf fanpetals Malvaceae
Sidalcea checkerbloom Malvaceae
Sidalcea neomexicana salt spring checkerbloom Malvaceae
Sidalcea neomexicana ssp. neomexicana salt spring checkerbloom Malvaceae
Sidalcea neomexicana ssp. thurberi Thurber's checkerbloom Malvaceae
Sideroxylon bully Sapotaceae
Sideroxylon lanuginosum gum bully Sapotaceae
Sideroxylon lanuginosum ssp. rigidum gum bully Sapotaceae
Silene catchfly Caryophyllaceae
Silene acaulis moss campion Caryophyllaceae
Silene acaulis var. subacaulescens moss campion Caryophyllaceae
Silene antirrhina sleepy silene Caryophyllaceae
Silene drummondii Drummond's campion Caryophyllaceae
Silene drummondii var. drummondii Drummond's campion Caryophyllaceae
Silene gallica common catchfly Caryophyllaceae
Silene laciniata cardinal catchfly Caryophyllaceae
Silene laciniata ssp. greggii cardinal catchfly Caryophyllaceae
Silene menziesii Menzies' campion Caryophyllaceae
Silene menziesii ssp. menziesii Menzies' campion Caryophyllaceae
Silene menziesii ssp. menziesii var. menziesii Menzies' campion Caryophyllaceae
Silene rectiramea Grand Canyon campion Caryophyllaceae
Silene scouleri simple campion Caryophyllaceae
Silene scouleri ssp. pringlei simple campion Caryophyllaceae
Silene scouleri ssp. pringlei var. concolor simple campion Caryophyllaceae
Silene scouleri ssp. pringlei var. eglandulosa simple campion Caryophyllaceae
Silene scouleri ssp. pringlei var. leptophylla simple campion Caryophyllaceae
Silene scouleri ssp. pringlei var. pringlei simple campion Caryophyllaceae
Silene thurberi woolly catchfly Caryophyllaceae
Silybum milkthistle Asteraceae
Silybum marianum blessed milkthistle Asteraceae
Simmondsia goatnut Simmondsiaceae
Simmondsia chinensis jojoba Simmondsiaceae
Simsia bushsunflower Asteraceae
Simsia lagasceiformis annual bushsunflower Asteraceae
Sinapis mustard Brassicaceae
Sinapis alba white mustard Brassicaceae
Sinapis arvensis charlock mustard Brassicaceae
Sinapis arvensis ssp. arvensis wild mustard Brassicaceae
Sisymbrium hedgemustard Brassicaceae
Sisymbrium altissimum tall tumblemustard Brassicaceae
Sisymbrium irio London rocket Brassicaceae
Sisymbrium orientale Indian hedgemustard Brassicaceae
Sisyrinchium blue-eyed grass Iridaceae
Sisyrinchium arizonicum Arizona blue-eyed grass Iridaceae
Sisyrinchium cernuum nodding blue-eyed grass Iridaceae
Sisyrinchium demissum stiff blue-eyed grass Iridaceae
Sisyrinchium idahoense Idaho blue-eyed grass Iridaceae
Sisyrinchium idahoense var. occidentale Idaho blue-eyed grass Iridaceae
Sisyrinchium longipes timberland blue-eyed grass Iridaceae
Sisyrinchium macrocarpon Willow Spring blue-eyed grass Iridaceae
Sium waterparsnip Apiaceae
Sium suave hemlock waterparsnip Apiaceae
Solanum nightshade Solanaceae
Solanum adscendens sonoita nightshade Solanaceae
Solanum americanum American black nightshade Solanaceae
Solanum carolinense Carolina horsenettle Solanaceae
Solanum carolinense var. carolinense Carolina horsenettle Solanaceae
Solanum douglasii greenspot nightshade Solanaceae
Solanum elaeagnifolium silverleaf nightshade Solanaceae
Solanum fendleri Fendler's horsenettle Solanaceae
Solanum fendleri var. fendleri Fendler's horsenettle Solanaceae
Solanum heterodoxum melonleaf nightshade Solanaceae
Solanum heterodoxum var. setigeroides melonleaf nightshade Solanaceae
Solanum hindsianum Hinds' nightshade Solanaceae
Solanum jamesii wild potato Solanaceae
Solanum lumholtzianum Sonoran nightshade Solanaceae
Solanum lycopersicum garden tomato Solanaceae
Solanum lycopersicum var. lycopersicum garden tomato Solanaceae
Solanum physalifolium hoe nightshade Solanaceae
Solanum pinnatisectum tansyleaf nightshade Solanaceae
Solanum ptycanthum West Indian nightshade Solanaceae
Solanum rostratum buffalobur nightshade Solanaceae
Solanum sisymbriifolium sticky nightshade Solanaceae
Solanum triflorum cutleaf nightshade Solanaceae
Solanum umbelliferum bluewitch nightshade Solanaceae
Solanum umbelliferum var. glabrescens bluewitch Solanaceae
Solanum xanti chaparral nightshade Solanaceae
Solanum xanti var. xanti chaparral nightshade Solanaceae
Solidago goldenrod Asteraceae
Solidago altissima Canada goldenrod Asteraceae
Solidago canadensis Canada goldenrod Asteraceae
Solidago canadensis var. gilvocanescens shorthair goldenrod Asteraceae
Solidago missouriensis Missouri goldenrod Asteraceae
Solidago missouriensis var. fasciculata Missouri goldenrod Asteraceae
Solidago missouriensis var. missouriensis Missouri goldenrod Asteraceae
Solidago missouriensis var. tenuissima Missouri goldenrod Asteraceae
Solidago multiradiata Rocky Mountain goldenrod Asteraceae
Solidago multiradiata var. scopulorum manyray goldenrod Asteraceae
Solidago nana baby goldenrod Asteraceae
Solidago simplex Mt. Albert goldenrod Asteraceae
Solidago simplex ssp. simplex Mt. Albert goldenrod Asteraceae
Solidago simplex ssp. simplex var. simplex Mt. Albert goldenrod Asteraceae
Solidago spectabilis Nevada goldenrod Asteraceae
Solidago spectabilis var. spectabilis Nevada goldenrod Asteraceae
Solidago velutina threenerve goldenrod Asteraceae
Solidago wrightii Wright's goldenrod Asteraceae
Solidago wrightii var. adenophora Wright's goldenrod Asteraceae
Solidago wrightii var. wrightii Wright's goldenrod Asteraceae
Soliva burrweed Asteraceae
Soliva sessilis field burrweed Asteraceae
Sonchus sowthistle Asteraceae
Sonchus asper spiny sowthistle Asteraceae
Sonchus oleraceus common sowthistle Asteraceae
Sophora necklacepod Fabaceae
Sophora arizonica Arizona necklacepod Fabaceae
Sophora nuttalliana silky sophora Fabaceae
Sophora stenophylla fringeleaf necklacepod Fabaceae
Sorbus mountain ash Rosaceae
Sorbus dumosa Arizona mountain ash Rosaceae
Sorbus scopulina Greene's mountain ash Rosaceae
Sorbus scopulina var. scopulina Greene's mountain ash Rosaceae
Sorghastrum Indiangrass Poaceae
Sorghastrum nutans Indiangrass Poaceae
Sorghum sorghum Poaceae
Sorghum bicolor sorghum Poaceae
Sorghum bicolor ssp. bicolor grain sorghum Poaceae
Sorghum bicolor ssp. drummondii Sudangrass Poaceae
Sorghum halepense Johnsongrass Poaceae
Sparganium bur-reed Sparganiaceae
Sparganium angustifolium narrowleaf bur-reed Sparganiaceae
Sparganium emersum European bur-reed Sparganiaceae
Sparganium eurycarpum broadfruit bur-reed Sparganiaceae
Sparganium natans small bur-reed Sparganiaceae
Spartina cordgrass Poaceae
Spartina gracilis alkali cordgrass Poaceae
Spergularia sandspurry Caryophyllaceae
Spergularia salina salt sandspurry Caryophyllaceae
Spermolepis scaleseed Apiaceae
Spermolepis echinata bristly scaleseed Apiaceae
Sphaeralcea globemallow Malvaceae
Sphaeralcea ambigua desert globemallow Malvaceae
Sphaeralcea ambigua ssp. ambigua apricot globemallow Malvaceae
Sphaeralcea ambigua ssp. rosacea rose globemallow Malvaceae
Sphaeralcea angustifolia copper globemallow Malvaceae
Sphaeralcea coccinea scarlet globemallow Malvaceae
Sphaeralcea coccinea ssp. coccinea scarlet globemallow Malvaceae
Sphaeralcea coccinea ssp. elata scarlet globemallow Malvaceae
Sphaeralcea coulteri Coulter's globemallow Malvaceae
Sphaeralcea digitata juniper globemallow Malvaceae
Sphaeralcea digitata ssp. digitata juniper globemallow Malvaceae
Sphaeralcea emoryi Emory's globemallow Malvaceae
Sphaeralcea fendleri Fendler's globemallow Malvaceae
Sphaeralcea fendleri ssp. albescens thicket globemallow Malvaceae
Sphaeralcea fendleri ssp. elongata thicket globemallow Malvaceae
Sphaeralcea fendleri ssp. fendleri Fendler's globemallow Malvaceae
Sphaeralcea fendleri ssp. tripartita thicket globemallow Malvaceae
Sphaeralcea fendleri ssp. venusta thicket globemallow Malvaceae
Sphaeralcea grossulariifolia gooseberryleaf globemallow Malvaceae
Sphaeralcea grossulariifolia ssp. grossulariifolia gooseberryleaf globemallow Malvaceae
Sphaeralcea grossulariifolia ssp. pedata gooseberryleaf globemallow Malvaceae
Sphaeralcea hastulata spear globemallow Malvaceae
Sphaeralcea incana gray globemallow Malvaceae
Sphaeralcea incana ssp. cuneata soft globemallow Malvaceae
Sphaeralcea incana ssp. incana gray globemallow Malvaceae
Sphaeralcea laxa caliche globemallow Malvaceae
Sphaeralcea leptophylla scaly globemallow Malvaceae
Sphaeralcea orcuttii Carrizo Creek globemallow Malvaceae
Sphaeralcea parvifolia smallflower globemallow Malvaceae
Sphaeralcea rusbyi Rusby's globemallow Malvaceae
Sphaeralcea rusbyi ssp. gilensis Gila globemallow Malvaceae
Sphaeralcea rusbyi ssp. rusbyi Rusby's globemallow Malvaceae
Sphaeralcea wrightii Wright's globemallow Malvaceae
Sphaerophysa sphaerophysa Fabaceae
Sphaerophysa salsula alkali swainsonpea Fabaceae
Sphenopholis wedgescale Poaceae
Sphenopholis intermedia slender wedgescale Poaceae
Sphenopholis obtusata prairie wedgescale Poaceae
Sphinctospermum sphinctospermum Fabaceae
Sphinctospermum constrictum hourglass peaseed Fabaceae
Spiranthes lady's tresses Orchidaceae
Spiranthes delitescens reclusive lady's tresses Orchidaceae
Spiranthes romanzoffiana hooded lady's tresses Orchidaceae
Spirodela duckmeat Lemnaceae
Spirodela polyrrhiza common duckmeat Lemnaceae
Sporobolus dropseed Poaceae
Sporobolus airoides alkali sacaton Poaceae
Sporobolus compositus composite dropseed Poaceae
Sporobolus compositus var. compositus composite dropseed Poaceae
Sporobolus contractus spike dropseed Poaceae
Sporobolus cryptandrus sand dropseed Poaceae
Sporobolus domingensis coral dropseed Poaceae
Sporobolus flexuosus mesa dropseed Poaceae
Sporobolus giganteus giant dropseed Poaceae
Sporobolus interruptus black dropseed Poaceae
Sporobolus junceus pineywoods dropseed Poaceae
Sporobolus nealleyi gyp dropseed Poaceae
Sporobolus neglectus puffsheath dropseed Poaceae
Sporobolus pyramidatus Madagascar dropseed Poaceae
Sporobolus texanus Texas dropseed Poaceae
Sporobolus vaginiflorus poverty dropseed Poaceae
Sporobolus vaginiflorus var. vaginiflorus poverty dropseed Poaceae
Sporobolus wrightii big sacaton Poaceae
Stachys hedgenettle Lamiaceae
Stachys coccinea scarlet hedgenettle Lamiaceae
Stachys crenata mousesear Lamiaceae
Stachys pilosa hairy hedgenettle Lamiaceae
Stachys pilosa var. pilosa hairy hedgenettle Lamiaceae
Stachys rothrockii Rothrock's hedgenettle Lamiaceae
Stanleya princesplume Brassicaceae
Stanleya albescens white princesplume Brassicaceae
Stanleya pinnata desert princesplume Brassicaceae
Stanleya pinnata var. pinnata desert princesplume Brassicaceae
Stellaria starwort Caryophyllaceae
Stellaria longifolia longleaf starwort Caryophyllaceae
Stellaria longifolia var. longifolia longleaf starwort Caryophyllaceae
Stellaria longipes longstalk starwort Caryophyllaceae
Stellaria longipes ssp. longipes chickweed, starwort Caryophyllaceae
Stellaria media common chickweed Caryophyllaceae
Stellaria media ssp. media common chickweed Caryophyllaceae
Stellaria nitens shiny chickweed Caryophyllaceae
Stellaria porsildii Porsild's starwort Caryophyllaceae
Stellaria umbellata umbrella starwort Caryophyllaceae
Stemodia twintip Scrophulariaceae
Stemodia durantifolia whitewoolly twintip Scrophulariaceae
Stenocereus stenocereus Cactaceae
Stenocereus thurberi organpipe cactus Cactaceae
Stenogonum buckwheat Polygonaceae
Stenogonum flexum bent two-whorl buckwheat Polygonaceae
Stenogonum salsuginosum salty buckwheat Polygonaceae
Stenorrhynchos lady orchid Orchidaceae
Stenorrhynchos michuacanum Michuacan lady orchid Orchidaceae
Stenotus mock goldenweed Asteraceae
Stenotus acaulis stemless mock goldenweed Asteraceae
Stenotus armerioides thrift mock goldenweed Asteraceae
Stenotus armerioides var. armerioides thrift mock goldenweed Asteraceae
Stephanomeria wirelettuce Asteraceae
Stephanomeria exigua small wirelettuce Asteraceae
Stephanomeria exigua ssp. exigua small wirelettuce Asteraceae
Stephanomeria minor lesser wirelettuce Asteraceae
Stephanomeria minor var. minor narrowleaf wirelettuce Asteraceae
Stephanomeria parryi Parry's wirelettuce Asteraceae
Stephanomeria pauciflora brownplume wirelettuce Asteraceae
Stephanomeria schottii Schott's wirelettuce Asteraceae
Stephanomeria thurberi Thurber's wirelettuce Asteraceae
Stevia candyleaf Asteraceae
Stevia lemmonii Lemmon's candyleaf Asteraceae
Stevia micrantha annual candyleaf Asteraceae
Stevia plummerae Plummer's candyleaf Asteraceae
Stevia plummerae var. alba Plummer's candyleaf Asteraceae
Stevia plummerae var. plummerae Plummer's candyleaf Asteraceae
Stevia serrata sawtooth candyleaf Asteraceae
Stevia viscida viscid candyleaf Asteraceae
Stillingia toothleaf Euphorbiaceae
Stillingia linearifolia queen's-root Euphorbiaceae
Stillingia paucidentata Mojave toothleaf Euphorbiaceae
Stillingia spinulosa annual toothleaf Euphorbiaceae
Streptanthella streptanthella Brassicaceae
Streptanthella longirostris longbeak streptanthella Brassicaceae
Streptanthus twistflower Brassicaceae
Streptanthus carinatus lyreleaf jewelflower Brassicaceae
Streptanthus carinatus ssp. arizonicus lyreleaf jewelflower Brassicaceae
Streptanthus carinatus ssp. carinatus lyreleaf jewelflower Brassicaceae
Streptanthus cordatus heartleaf twistflower Brassicaceae
Streptanthus cordatus var. cordatus heartleaf twistflower Brassicaceae
Streptanthus lemmonii Lemmon's jewelflower Brassicaceae
Streptopus twistedstalk Liliaceae
Streptopus amplexifolius claspleaf twistedstalk Liliaceae
Streptopus amplexifolius var. amplexifolius claspleaf twistedstalk Liliaceae
Strophostyles fuzzybean Fabaceae
Strophostyles leiosperma slickseed fuzzybean Fabaceae
Stuckenia pondweed Potamogetonaceae
Stuckenia filiformis fineleaf pondweed Potamogetonaceae
Stuckenia filiformis ssp. alpina fineleaf pondweed Potamogetonaceae
Stuckenia pectinata sago pondweed Potamogetonaceae
Stuckenia striata broadleaf pondweed Potamogetonaceae
Stylocline neststraw Asteraceae
Stylocline gnaphalioides mountain neststraw Asteraceae
Stylocline intertexta Morefield's neststraw Asteraceae
Stylocline micropoides woollyhead neststraw Asteraceae
Stylocline sonorensis Sonoran neststraw Asteraceae
Stylosanthes pencilflower Fabaceae
Stylosanthes biflora sidebeak pencilflower Fabaceae
Stylosanthes humilis Townsville stylo Fabaceae
Suaeda seepweed Chenopodiaceae
Suaeda calceoliformis Pursh seepweed Chenopodiaceae
Suaeda moquinii Mojave seablite Chenopodiaceae
Suaeda suffrutescens desert seepweed Chenopodiaceae
Suaeda suffrutescens var. suffrutescens desert seepweed Chenopodiaceae
Swertia felwort Gentianaceae
Swertia perennis felwort Gentianaceae
Symphoricarpos snowberry Caprifoliaceae
Symphoricarpos longiflorus desert snowberry Caprifoliaceae
Symphoricarpos oreophilus mountain snowberry Caprifoliaceae
Symphoricarpos oreophilus var. oreophilus mountain snowberry Caprifoliaceae
Symphoricarpos oreophilus var. utahensis Utah snowberry Caprifoliaceae
Symphoricarpos palmeri Palmer's snowberry Caprifoliaceae
Symphoricarpos rotundifolius roundleaf snowberry Caprifoliaceae
Symphoricarpos rotundifolius var. parishii Parish's snowberry Caprifoliaceae
Symphyotrichum aster Asteraceae
Symphyotrichum ascendens western aster Asteraceae
Symphyotrichum eatonii Eaton's aster Asteraceae
Symphyotrichum ericoides white heath aster Asteraceae
Symphyotrichum ericoides var. ericoides white heath aster Asteraceae
Symphyotrichum expansum southwestern annual saltmarsh aster Asteraceae
Symphyotrichum falcatum white prairie aster Asteraceae
Symphyotrichum falcatum var. commutatum white prairie aster Asteraceae
Symphyotrichum falcatum var. falcatum white prairie aster Asteraceae
Symphyotrichum foliaceum alpine leafybract aster Asteraceae
Symphyotrichum foliaceum var. canbyi Canby's aster Asteraceae
Symphyotrichum foliaceum var. parryi Parry's aster Asteraceae
Symphyotrichum frondosum short-rayed alkali aster Asteraceae
Symphyotrichum laeve smooth blue aster Asteraceae
Symphyotrichum laeve var. geyeri Geyer's aster Asteraceae
Symphyotrichum lanceolatum white panicle aster Asteraceae
Symphyotrichum lanceolatum ssp. hesperium white panicle aster Asteraceae
Symphyotrichum lanceolatum ssp. hesperium var. hesperium white panicle aster Asteraceae
Symphyotrichum potosinum Santa Rita Mountain aster Asteraceae
Syntrichopappus Fremont's-gold Asteraceae
Syntrichopappus fremontii yellowray Fremont's-gold Asteraceae
T
Tagetes marigold Asteraceae
Tagetes lemmonii Lemmon's marigold Asteraceae
Tagetes micrantha licorice marigold Asteraceae
Talinum fameflower Portulacaceae
Talinum gooddingii Goodding's fameflower Portulacaceae
Talinum paniculatum jewels of Opar Portulacaceae
Tamarix tamarisk Tamaricaceae
Tamarix africana African tamarisk Tamaricaceae
Tamarix aphylla Athel tamarisk Tamaricaceae
Tamarix canariensis Canary Island tamarisk Tamaricaceae
Tamarix chinensis five-stamen tamarisk Tamaricaceae
Tamarix parviflora smallflower tamarisk Tamaricaceae
Tamarix ramosissima saltcedar Tamaricaceae
Tanacetum tansy Asteraceae
Tanacetum vulgare common tansy Asteraceae
Taraxacum dandelion Asteraceae
Taraxacum laevigatum rock dandelion Asteraceae
Taraxacum lyratum harp dandelion Asteraceae
Taraxacum officinale common dandelion Asteraceae
Taraxacum officinale ssp. officinale common dandelion Asteraceae
Tecoma trumpetbush Bignoniaceae
Tecoma stans yellow trumpetbush Bignoniaceae
Tephrosia hoarypea Fabaceae
Tephrosia leiocarpa smoothpod hoarypea Fabaceae
Tephrosia thurberi Thurber's hoarypea Fabaceae
Tephrosia vicioides red hoarypea Fabaceae
Tetraclea tetraclea Verbenaceae
Tetraclea coulteri Coulter's wrinklefruit Verbenaceae
Tetracoccus shrubby-spurge Euphorbiaceae
Tetracoccus hallii Hall's shrubby-spurge Euphorbiaceae
Tetradymia horsebrush Asteraceae
Tetradymia argyraea striped cottonthorn Asteraceae
Tetradymia axillaris longspine horsebrush Asteraceae
Tetradymia axillaris var. longispina longspine horsebrush Asteraceae
Tetradymia canescens spineless horsebrush Asteraceae
Tetradymia stenolepis Mojave cottonthorn Asteraceae
Tetramerium tetramerium Acanthaceae
Tetramerium nervosum hairy fournwort Acanthaceae
Tetraneuris four-nerve daisy Asteraceae
Tetraneuris acaulis stemless four-nerve daisy Asteraceae
Tetraneuris acaulis var. arizonica Arizona four-nerve daisy Asteraceae
Tetraneuris argentea perkysue Asteraceae
Tetraneuris brandegeei Brandegee's four-nerve daisy Asteraceae
Tetraneuris ivesiana Ives' fournerved daisy Asteraceae
Teucrium germander Lamiaceae
Teucrium canadense Canada germander Lamiaceae
Teucrium canadense var. canadense Canada germander Lamiaceae
Teucrium canadense var. occidentale western germander Lamiaceae
Teucrium cubense small coastal germander Lamiaceae
Teucrium cubense var. densum small coastal germander Lamiaceae
Teucrium glandulosum sticky germander Lamiaceae
Thalictrum meadow-rue Ranunculaceae
Thalictrum dasycarpum purple meadow-rue Ranunculaceae
Thalictrum fendleri Fendler's meadow-rue Ranunculaceae
Thalictrum fendleri var. fendleri Fendler's meadow-rue Ranunculaceae
Thalictrum fendleri var. wrightii Wright's meadow-rue Ranunculaceae
Thalictrum revolutum waxyleaf meadow-rue Ranunculaceae
Thamnosma desertrue Rutaceae
Thamnosma montana turpentinebroom Rutaceae
Thamnosma texana rue of the mountains Rutaceae
Thelesperma greenthread Asteraceae
Thelesperma longipes longstalk greenthread Asteraceae
Thelesperma megapotamicum Hopi tea greenthread Asteraceae
Thelesperma simplicifolium slender greenthread Asteraceae
Thelesperma subnudum Navajo tea Asteraceae
Thelesperma subnudum var. subnudum Navajo tea Asteraceae
Thelypodiopsis tumblemustard Brassicaceae
Thelypodiopsis ambigua Long Valley tumblemustard Brassicaceae
Thelypodiopsis ambigua var. ambigua Long Valley tumblemustard Brassicaceae
Thelypodiopsis ambigua var. erecta Long Valley tumblemustard Brassicaceae
Thelypodiopsis purpusii Purpus' tumblemustard Brassicaceae
Thelypodium thelypody Brassicaceae
Thelypodium integrifolium entireleaved thelypody Brassicaceae
Thelypodium integrifolium ssp. gracilipes entireleaved thelypody Brassicaceae
Thelypodium integrifolium ssp. longicarpum entireleaved thelypody Brassicaceae
Thelypodium wrightii Wright's thelypody Brassicaceae
Thelypodium wrightii ssp. wrightii Wright's thelypody Brassicaceae
Thelypteris maiden fern Thelypteridaceae
Thelypteris puberula showy maiden fern Thelypteridaceae
Thelypteris puberula var. sonorensis Sonoran maiden fern Thelypteridaceae
Thermopsis goldenbanner Fabaceae
Thermopsis montana mountain goldenbanner Fabaceae
Thermopsis montana var. montana mountain goldenbanner Fabaceae
Thinopyrum wheatgrass Poaceae
Thinopyrum intermedium intermediate wheatgrass Poaceae
Thinopyrum ponticum tall wheatgrass Poaceae
Thlaspi pennycress Brassicaceae
Thlaspi arvense field pennycress Brassicaceae
Thymophylla pricklyleaf Asteraceae
Thymophylla acerosa pricklyleaf dogweed Asteraceae
Thymophylla concinna Sonoran pricklyleaf Asteraceae
Thymophylla pentachaeta fiveneedle pricklyleaf Asteraceae
Thymophylla pentachaeta var. belenidium fiveneedle pricklyleaf Asteraceae
Thymophylla pentachaeta var. hartwegii Hartweg's pricklyleaf Asteraceae
Thysanocarpus fringepod Brassicaceae
Thysanocarpus curvipes sand fringepod Brassicaceae
Tidestromia honeysweet Amaranthaceae
Tidestromia lanuginosa woolly tidestromia Amaranthaceae
Tidestromia oblongifolia Arizona honeysweet Amaranthaceae
Tillandsia airplant Bromeliaceae
Tillandsia recurvata small ballmoss Bromeliaceae
Tiquilia crinklemat Boraginaceae
Tiquilia canescens woody crinklemat Boraginaceae
Tiquilia canescens var. canescens woody crinklemat Boraginaceae
Tiquilia canescens var. pulchella woody crinklemat Boraginaceae
Tiquilia latior matted crinklemat Boraginaceae
Tiquilia nuttallii Nuttall's crinklemat Boraginaceae
Tiquilia palmeri Palmer's crinklemat Boraginaceae
Tiquilia plicata fanleaf crinklemat Boraginaceae
Tithonia tithonia Asteraceae
Tithonia thurberi Arizona sunflowerweed Asteraceae
Tordylium tordylium Apiaceae
Tordylium apulum Mediterranean hartwort Apiaceae
Torilis hedgeparsley Apiaceae
Torilis nodosa knotted hedgeparsley Apiaceae
Torreyochloa false mannagrass Poaceae
Torreyochloa pallida pale false mannagrass Poaceae
Torreyochloa pallida var. pauciflora pale false mannagrass Poaceae
Townsendia Townsend daisy Asteraceae
Townsendia annua annual Townsend daisy Asteraceae
Townsendia exscapa stemless Townsend daisy Asteraceae
Townsendia formosa smooth Townsend daisy Asteraceae
Townsendia incana hoary Townsend daisy Asteraceae
Townsendia jonesii Jones' Townsend daisy Asteraceae
Townsendia jonesii var. jonesii Jones' Townsend daisy Asteraceae
Townsendia leptotes common Townsend daisy Asteraceae
Townsendia smithii Black Rock Townsend daisy Asteraceae
Toxicodendron poison oak Anacardiaceae
Toxicodendron radicans eastern poison ivy Anacardiaceae
Toxicodendron radicans ssp. divaricatum eastern poison ivy Anacardiaceae
Toxicodendron rydbergii western poison ivy Anacardiaceae
Trachypogon crinkleawn grass Poaceae
Trachypogon spicatus spiked crinkleawn Poaceae
Tradescantia spiderwort Commelinaceae
Tradescantia occidentalis prairie spiderwort Commelinaceae
Tradescantia occidentalis var. occidentalis prairie spiderwort Commelinaceae
Tradescantia occidentalis var. scopulorum prairie spiderwort Commelinaceae
Tradescantia pinetorum pinewoods spiderwort Commelinaceae
Tragia noseburn Euphorbiaceae
Tragia amblyodonta dogtooth noseburn Euphorbiaceae
Tragia laciniata Sonoita noseburn Euphorbiaceae
Tragia nepetifolia catnip noseburn Euphorbiaceae
Tragia nepetifolia var. dissecta catnip noseburn Euphorbiaceae
Tragia ramosa branched noseburn Euphorbiaceae
Tragopogon goatsbeard Asteraceae
Tragopogon dubius yellow salsify Asteraceae
Tragopogon lamottei Jack-go-to-bed-at-noon Asteraceae
Tragopogon mirus remarkable goatsbeard Asteraceae
Tragopogon miscellus Moscow salsify Asteraceae
Tragopogon porrifolius salsify Asteraceae
Tragus bur grass Poaceae
Tragus berteronianus spiked bur grass Poaceae
Tragus racemosus stalked bur grass Poaceae
Trautvetteria bugbane Ranunculaceae
Trautvetteria caroliniensis Carolina bugbane Ranunculaceae
Trautvetteria caroliniensis var. occidentalis western bugbane Ranunculaceae
Trianthema trianthema Aizoaceae
Trianthema portulacastrum desert horsepurslane Aizoaceae
Tribulus puncturevine Zygophyllaceae
Tribulus terrestris puncturevine Zygophyllaceae
Tricardia tricardia Hydrophyllaceae
Tricardia watsonii threehearts Hydrophyllaceae
Trichloris Poaceae
Trichloris crinita false Rhodes grass Poaceae
Trichoptilium trichoptilium Asteraceae
Trichoptilium incisum yellowdome Asteraceae
Trichostema bluecurls Lamiaceae
Trichostema arizonicum Arizona bluecurls Lamiaceae
Trichostema brachiatum fluxweed Lamiaceae
Trichostema micranthum smallflower bluecurls Lamiaceae
Tridens tridens Poaceae
Tridens albescens white tridens Poaceae
Tridens eragrostoides lovegrass tridens Poaceae
Tridens muticus slim tridens Poaceae
Tridens muticus var. elongatus slim tridens Poaceae
Tridens muticus var. muticus slim tridens Poaceae
Trifolium clover Fabaceae
Trifolium albopurpureum rancheria clover Fabaceae
Trifolium amabile Aztec clover Fabaceae
Trifolium andinum Intermountain clover Fabaceae
Trifolium andinum var. andinum Intermountain clover Fabaceae
Trifolium bejariense Bejar clover Fabaceae
Trifolium dasyphyllum alpine clover Fabaceae
Trifolium dasyphyllum ssp. uintense Uinta clover Fabaceae
Trifolium dubium suckling clover Fabaceae
Trifolium gracilentum pinpoint clover Fabaceae
Trifolium gracilentum var. gracilentum pinpoint clover Fabaceae
Trifolium gymnocarpon hollyleaf clover Fabaceae
Trifolium gymnocarpon ssp. gymnocarpon hollyleaf clover Fabaceae
Trifolium gymnocarpon ssp. plummerae Plummer's clover Fabaceae
Trifolium hybridum alsike clover Fabaceae
Trifolium kingii King's clover Fabaceae
Trifolium kingii ssp. macilentum King's clover Fabaceae
Trifolium longipes longstalk clover Fabaceae
Trifolium longipes ssp. pygmaeum pygmy clover Fabaceae
Trifolium longipes ssp. reflexum droopflower clover Fabaceae
Trifolium microcephalum smallhead clover Fabaceae
Trifolium mucronatum cusp clover Fabaceae
Trifolium mucronatum ssp. lacerum spinytooth clover Fabaceae
Trifolium neurophyllum White Mountain clover Fabaceae
Trifolium pinetorum woods clover Fabaceae
Trifolium pratense red clover Fabaceae
Trifolium repens white clover Fabaceae
Trifolium variegatum whitetip clover Fabaceae
Trifolium willdenovii tomcat clover Fabaceae
Trifolium wormskioldii cows clover Fabaceae
Triglochin arrowgrass Juncaginaceae
Triglochin maritima seaside arrowgrass Juncaginaceae
Triglochin palustris marsh arrowgrass Juncaginaceae
Triodanis Venus' looking-glass Campanulaceae
Triodanis biflora small Venus' looking-glass Campanulaceae
Triodanis holzingeri Holzinger's Venus' looking-glass Campanulaceae
Triodanis perfoliata clasping Venus' looking-glass Campanulaceae
Tripsacum gamagrass Poaceae
Tripsacum lanceolatum Mexican gamagrass Poaceae
Tripterocalyx sandpuffs Nyctaginaceae
Tripterocalyx carneus winged sandpuffs Nyctaginaceae
Tripterocalyx carneus var. wootonii Wooton's sandpuffs Nyctaginaceae
Tripterocalyx micranthus smallflower sandverbena Nyctaginaceae
Trisetum oatgrass Poaceae
Trisetum canescens tall trisetum Poaceae
Trisetum interruptum prairie false oat Poaceae
Trisetum spicatum spike trisetum Poaceae
Triteleia triteleia Liliaceae
Triteleia lemmoniae Oak Creek triteleia Liliaceae
Triteleiopsis Bajalily Liliaceae
Triteleiopsis palmeri Palmer's Bajalily Liliaceae
Triticum wheat Poaceae
Triticum aestivum common wheat Poaceae
Trixis threefold Asteraceae
Trixis californica American threefold Asteraceae
Tumamoca tumamoca Cucurbitaceae
Tumamoca macdougalii Tumamoc globeberry Cucurbitaceae
Typha cattail Typhaceae
Typha domingensis southern cattail Typhaceae
Typha latifolia broadleaf cattail Typhaceae
U
Ulmus elm Ulmaceae
Ulmus parvifolia Chinese elm Ulmaceae
Ulmus pumila Siberian elm Ulmaceae
Urochloa signalgrass Poaceae
Urochloa arizonica Arizona signalgrass Poaceae
Urochloa fusca browntop signalgrass Poaceae
Urochloa maxima guineagrass Poaceae
Urochloa panicoides panic liverseed grass Poaceae
Urochloa platyphylla broadleaf signalgrass Poaceae
Urochloa texana Texas signalgrass Poaceae
Urtica nettle Urticaceae
Urtica dioica stinging nettle Urticaceae
Urtica dioica ssp. gracilis California nettle Urticaceae
Urtica dioica ssp. holosericea stinging nettle Urticaceae
Urtica gracilenta mountain nettle Urticaceae
Urtica urens dwarf nettle Urticaceae
Utricularia bladderwort Lentibulariaceae
Utricularia macrorhiza common bladderwort Lentibulariaceae
Utricularia minor lesser bladderwort Lentibulariaceae
V
Vaccaria soapwort Caryophyllaceae
Vaccaria hispanica cow soapwort Caryophyllaceae
Vaccinium blueberry Ericaceae
Vaccinium geminiflorum Mexican blueberry Ericaceae
Vaccinium membranaceum thinleaf huckleberry Ericaceae
Vaccinium myrtillus whortleberry Ericaceae
Valeriana valerian Valerianaceae
Valeriana acutiloba sharpleaf valerian Valerianaceae
Valeriana acutiloba var. acutiloba sharpleaf valerian Valerianaceae
Valeriana arizonica Arizona valerian Valerianaceae
Valeriana edulis tobacco root Valerianaceae
Valeriana edulis var. edulis tobacco root Valerianaceae
Valeriana occidentalis western valerian Valerianaceae
Valeriana sorbifolia pineland valerian Valerianaceae
Vallisneria eelgrass Hydrocharitaceae
Vallisneria americana American eelgrass Hydrocharitaceae
Vanclevea vanclevea Asteraceae
Vanclevea stylosa pillar false gumweed Asteraceae
Vauquelinia rosewood Rosaceae
Vauquelinia californica Arizona rosewood Rosaceae
Vauquelinia californica ssp. californica Arizona rosewood Rosaceae
Vauquelinia californica ssp. pauciflora Arizona rosewood Rosaceae
Vauquelinia californica ssp. sonorensis Sonora rosewood Rosaceae
Veratrum false hellebore Liliaceae
Veratrum californicum California false hellebore Liliaceae
Veratrum californicum var. californicum California false hellebore Liliaceae
Verbascum mullein Scrophulariaceae
Verbascum blattaria moth mullein Scrophulariaceae
Verbascum thapsus common mullein Scrophulariaceae
Verbascum virgatum wand mullein Scrophulariaceae
Verbena vervain Verbenaceae
Verbena bonariensis purpletop vervain Verbenaceae
Verbena bonariensis var. bonariensis purpletop vervain Verbenaceae
Verbena bracteata bigbract verbena Verbenaceae
Verbena carolina Carolina vervain Verbenaceae
Verbena ehrenbergiana Ehrenberg's vervain Verbenaceae
Verbena gracilis Fort Huachuca vervain Verbenaceae
Verbena halei Texas vervain Verbenaceae
Verbena hastata swamp verbena Verbenaceae
Verbena hastata var. scabra swamp verbena Verbenaceae
Verbena macdougalii MacDougal verbena Verbenaceae
Verbena menthifolia mint vervain Verbenaceae
Verbena neomexicana hillside vervain Verbenaceae
Verbena neomexicana var. hirtella hillside vervain Verbenaceae
Verbena neomexicana var. neomexicana hillside vervain Verbenaceae
Verbena neomexicana var. xylopoda hillside vervain Verbenaceae
Verbena perennis pinleaf vervain Verbenaceae
Verbena pinetorum Chihuahuan vervain Verbenaceae
Verbena plicata fanleaf vervain Verbenaceae
Verbena scabra sandpaper vervain Verbenaceae
Verbena stricta hoary verbena Verbenaceae
Verbena xutha Gulf vervain Verbenaceae
Verbesina crownbeard Asteraceae
Verbesina encelioides golden crownbeard Asteraceae
Verbesina encelioides ssp. exauriculata golden crownbeard Asteraceae
Verbesina longifolia longleaf crownbeard Asteraceae
Verbesina rothrockii Rothrock's crownbeard Asteraceae
Vernonia ironweed Asteraceae
Vernonia marginata plains ironweed Asteraceae
Veronica speedwell Scrophulariaceae
Veronica americana American speedwell Scrophulariaceae
Veronica anagallis-aquatica water speedwell Scrophulariaceae
Veronica arvensis corn speedwell Scrophulariaceae
Veronica peregrina neckweed Scrophulariaceae
Veronica peregrina ssp. xalapensis hairy purslane speedwell Scrophulariaceae
Veronica persica birdeye speedwell Scrophulariaceae
Veronica polita gray field speedwell Scrophulariaceae
Veronica serpyllifolia thymeleaf speedwell Scrophulariaceae
Veronica serpyllifolia ssp. humifusa brightblue speedwell Scrophulariaceae
Veronica wormskjoldii American alpine speedwell Scrophulariaceae
Veronica wormskjoldii var. wormskjoldii American alpine speedwell Scrophulariaceae
Vicia vetch Fabaceae
Vicia americana American vetch Fabaceae
Vicia americana ssp. americana American vetch Fabaceae
Vicia americana ssp. minor mat vetch Fabaceae
Vicia leucophaea Mogollon Mountain vetch Fabaceae
Vicia ludoviciana Louisiana vetch Fabaceae
Vicia ludoviciana ssp. ludoviciana Louisiana vetch Fabaceae
Vicia pulchella sweetclover vetch Fabaceae
Vicia sativa garden vetch Fabaceae
Vicia sativa ssp. nigra garden vetch Fabaceae
Vicia villosa winter vetch Fabaceae
Vicia villosa ssp. villosa winter vetch Fabaceae
Viguiera goldeneye Asteraceae
Viguiera cordifolia heartleaf goldeneye Asteraceae
Viguiera dentata toothleaf goldeneye Asteraceae
Viguiera dentata var. dentata toothleaf goldeneye Asteraceae
Viguiera dentata var. lancifolia toothleaf goldeneye Asteraceae
Viguiera parishii Parish's goldeneye Asteraceae
Viguiera triloba yellow streamers Asteraceae
Vinca periwinkle Apocynaceae
Vinca major bigleaf periwinkle Apocynaceae
Vinca minor common periwinkle Apocynaceae
Viola violet Violaceae
Viola adunca hookedspur violet Violaceae
Viola adunca var. adunca hookedspur violet Violaceae
Viola bicolor field pansy Violaceae
Viola canadensis Canadian white violet Violaceae
Viola canadensis var. rugulosa creepingroot violet Violaceae
Viola canadensis var. scariosa Canadian white violet Violaceae
Viola nephrophylla northern bog violet Violaceae
Viola odorata sweet violet Violaceae
Viola palustris marsh violet Violaceae
Viola palustris var. brevipes marsh violet Violaceae
Viola pedatifida prairie violet Violaceae
Viola purpurea goosefoot violet Violaceae
Viola purpurea ssp. mohavensis goosefoot violet Violaceae
Viola umbraticola Ponderosa violet Violaceae
Viola umbraticola var. glaberrima Ponderosa violet Violaceae
Viola vallicola sagebrush violet Violaceae
Viola vallicola var. vallicola sagebrush violet Violaceae
Vitex chastetree Verbenaceae
Vitex agnus-castus lilac chastetree Verbenaceae
Vitex agnus-castus var. agnus-castus lilac chastetree Verbenaceae
Vitis grape Vitaceae
Vitis arizonica canyon grape Vitaceae
Vulpia fescue Poaceae
Vulpia bromoides brome fescue Poaceae
Vulpia microstachys small fescue Poaceae
Vulpia microstachys var. ciliata Eastwood fescue Poaceae
Vulpia microstachys var. microstachys desert fescue Poaceae
Vulpia microstachys var. pauciflora Pacific fescue Poaceae
Vulpia myuros rat-tail fescue Poaceae
Vulpia octoflora sixweeks fescue Poaceae
Vulpia octoflora var. glauca sixweeks fescue Poaceae
Vulpia octoflora var. hirtella sixweeks fescue Poaceae
Vulpia octoflora var. octoflora sixweeks fescue Poaceae
W
Waltheria waltheria Sterculiaceae
Waltheria indica uhaloa Sterculiaceae
Washingtonia fan palm Arecaceae
Washingtonia filifera California fan palm Arecaceae
Wislizenia wislizenia Capparaceae
Wislizenia refracta spectacle fruit Capparaceae
Wislizenia refracta ssp. refracta spectacle fruit Capparaceae
Woodsia cliff fern Dryopteridaceae
Woodsia cochisensis Cochise cliff fern Dryopteridaceae
Woodsia neomexicana New Mexico cliff fern Dryopteridaceae
Woodsia oregana Oregon cliff fern Dryopteridaceae
Woodsia oregana ssp. cathcartiana Oregon cliff fern Dryopteridaceae
Woodsia phillipsii Phillips' cliff fern Dryopteridaceae
Woodsia plummerae Plummer's cliff fern Dryopteridaceae
Woodsia scopulina Rocky Mountain woodsia Dryopteridaceae
Woodsia scopulina ssp. laurentiana Laurent's cliff fern Dryopteridaceae
Woodwardia chainfern Blechnaceae
Woodwardia fimbriata giant chainfern Blechnaceae
Wyethia mule-ears Asteraceae
Wyethia arizonica Arizona mule-ears Asteraceae
X
Xanthisma sleepydaisy Asteraceae
Xanthisma texanum Texas sleepydaisy Asteraceae
Xanthisma texanum ssp. drummondii Drummond's sleepydaisy Asteraceae
Xanthium cocklebur Asteraceae
Xanthium spinosum spiny cocklebur Asteraceae
Xanthium strumarium rough cocklebur Asteraceae
Xanthium strumarium var. canadense Canada cocklebur Asteraceae
Xanthocephalum xanthocephalum Asteraceae
Xanthocephalum gymnospermoides San Pedro matchweed Asteraceae
Xylorhiza woodyaster Asteraceae
Xylorhiza tortifolia Mojave woodyaster Asteraceae
Xylorhiza tortifolia var. imberbis imberis woodyaster Asteraceae
Xylorhiza tortifolia var. tortifolia Mojave woodyaster Asteraceae
Y
Yabea yabea Apiaceae
Yabea microcarpa false carrot Apiaceae
Yucca yucca Agavaceae
Yucca angustissima narrowleaf yucca Agavaceae
Yucca angustissima var. angustissima narrowleaf yucca Agavaceae
Yucca angustissima var. kanabensis Kanab yucca Agavaceae
Yucca baccata banana yucca Agavaceae
Yucca baileyi Navajo yucca Agavaceae
Yucca baileyi var. baileyi Navajo yucca Agavaceae
Yucca baileyi var. navajoa Navajo yucca Agavaceae
Yucca brevifolia Joshua tree Agavaceae
Yucca brevifolia var. brevifolia Joshua tree Agavaceae
Yucca brevifolia var. jaegeriana Jaeger's Joshua tree Agavaceae
Yucca elata soaptree yucca Agavaceae
Yucca harrimaniae Spanish bayonet Agavaceae
Yucca harrimaniae var. harrimaniae Spanish bayonet Agavaceae
Yucca karlsruhensis Agavaceae
Yucca madrensis Agavaceae
Yucca schidigera Mojave yucca Agavaceae
Yucca schottii Schott's yucca Agavaceae
Z
Zannichellia horned pondweed Zannichelliaceae
Zannichellia palustris horned pondweed Zannichelliaceae
Zapoteca white stickpea Fabaceae
Zapoteca formosa Schott's stickpea Fabaceae
Zapoteca formosa var. schottii Schott's stickpea Fabaceae
Zea corn Poaceae
Zea mays corn Poaceae
Zea mays ssp. mays corn Poaceae
Zephyranthes zephyrlily Liliaceae
Zephyranthes longifolia copper zephyrlily Liliaceae
Zigadenus deathcamas Liliaceae
Zigadenus elegans mountain deathcamas Liliaceae
Zigadenus elegans ssp. elegans mountain deathcamas Liliaceae
Zigadenus paniculatus foothill deathcamas Liliaceae
Zigadenus virescens green deathcamas Liliaceae
Zinnia zinnia Asteraceae
Zinnia acerosa desert zinnia Asteraceae
Zinnia grandiflora Rocky Mountain zinnia Asteraceae
Zinnia peruviana Peruvian zinnia Asteraceae
Zizania wildrice Poaceae
Zizania palustris northern wildrice Poaceae
Zizania palustris var. palustris northern wildrice Poaceae
Ziziphus jujube Rhamnaceae
Ziziphus obtusifolia lotebush Rhamnaceae
Ziziphus obtusifolia var. canescens lotebush Rhamnaceae
Ziziphus obtusifolia var. obtusifolia lotebush Rhamnaceae
Zornia zornia Fabaceae
Zornia leptophylla horsekiller Fabaceae
Zornia reticulata neto hoja zarzabacoa de dos hojas Fabaceae
Zuckia zuckia Chenopodiaceae
Zuckia brandegeei siltbush Chenopodiaceae
Zuckia brandegeei var. arizonica Arizona siltbush Chenopodiaceae
Zuckia brandegeei var. brandegeei siltbush Chenopodiaceae