| 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. |
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| 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 | |