Southeastern Arizona plant common names that begin with A.
- Abert's Creeping Zinnia
- Abert's Dome
- Abert's Sanvitalia
- Abutilon, Dwarf
- Abutilon, Hoary
- Acacia, Catclaw
- Acacia, Prairie
- Acacia, White-ball
- Acacia, White-thorn
- Acacia, Whitethorn
- Adonis Blazingstar
- Adonis Stickleaf
- African Daisy
- African Sumac
- Agave, Golden-flowered
- Agave, Palmer's
- Agave, Schott's
- Ageratum, Texas
- Albert's Creeping Zinnia
- Alfalfa
- Alfalfa, Wild
- Alkali Marsh Aster
- Alkaline Aster
- Alligator Juniper
- Alpine False Springparsley
- Amaranth, Fringed
- Amaranth, Palmer
- Amaranth, Palmer's
- Amberlily
- Ambrosia Leaf Bur Ragweed
- Ambrosia Leaf Burr-Ragweed
- American Aspen
- American Black Elderberry
- American Black Nightshade
- American Threefold
- American Wild Carrot
- Anemone, Desert
- Anemone, Tuber
- Angel's-wings
- Annual Monsterwort
- Annual Sowthistle
- Annual Toadflax
- Annual Windmills
- Annual Yellow Sweet Clover
- Annual Yellow Sweetclover
- Anoda, Crested
- Anoda, Indian
- Anoda, Spurred
- Antelope Horns
- Antelope-horns, Spider
- Antelopehorn Milkweed
- Apache Beggarticks
- Apache Plant
- Apache Plume
- Aphid Trap
- Arid Machaeranthera
- Arid Tansyaster
- Arizona Barrel Cactus
- Arizona Beggarticks
- Arizona Black Walnut
- Arizona Blue Curls
- Arizona Blue Eyes
- Arizona Bluecurls
- Arizona Caltrop
- Arizona Carlowrightia
- Arizona Centaury
- Arizona Fishhook
- Arizona Foldwing
- Arizona Grape
- Arizona Jewelflower
- Arizona Lupine
- Arizona Milkweed
- Arizona Passionflower
- Arizona Pencil Cholla
- Arizona Penstemon
- Arizona Phacelia
- Arizona Popcornflower
- Arizona Poppy
- Arizona Rosewood
- Arizona Scarlet-bugler
- Arizona Scorpion-weed
- Arizona Scorpionweed
- Arizona Snake-cotton
- Arizona Snakecotton
- Arizona Springparsley
- Arizona Sycamore
- Arizona Thistle
- Arizona Walnut
- Arizona Wrightwort
- Arizonia Passionflower
- Arroyo Lupine
- Ash, Velvet
- Asian Mustard
- Aspen, American
- Aspen, Golden
- Aspen, Quaking
- Aspen, Trembling
- Aster, Alkali Marsh
- Aster, Alkaline
- Aster, Few-flower
- Aster, Few-flowered
- Aster, Golden
- Aster, Marsh Alkali
- Aster, Purple
- Aster, Tanseyleaf
- Aster, Tanseyleaf Spine
- Aster, Tansy