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| scientific name | common name(s) | image gallery |
| Abutilon fruticosum | Indian mallow Texas Indian mallow | |
| Abutilon incanum | Indian mallow Pelotazo Shrubby Indian mallow | |
| Abutilon wrightii | Wright's Indian mallow | |
| Acacia farnesiana | Huisache Sweet acacia Mealy wattle | |
| Acer grandidentatum | Bigtooth maple Big-toothed maple Canyon maple | |
| Acacia greggii var. wrightii | Catclaw acacia Catclaw Wright acacia | |
| Acer negundo | Ash-leaf maple Ash-leaved maple Box elder Boxelder Fresno de guajuco | |
| Acmella oppositifolia var. repens | Oppositeleaf spotflower Opposite-leaf spotflower | |
| Acalypha ostryifolia | Pineland threeseed mercury Hop-hornbeam copperleaf | |
| Acalypha phleoides | Shrubby copperleaf Three-seeded mercury | |
| Acalypha radians | Cardinal's feather Cardinal feather | |
| Acourtia runcinata | Featherleaf desertpeony Peonia | |
| Adiantum capillus-veneris | Southern maidenhair fern Common maidenhair fern Maidenhair fern Venus hair fern | |
| Aesculus glabra var. arguta | Ohio buckeye White buckeye Texas buckeye | |
| Aesculus pavia | Scarlet Buckeye Red buckeye Firecracker plant | |
| Aesculus pavia var. pavia | Scarlet buckeye Red buckeye Southern buckeye Firecracker plant | |
| Ageratina altissima var. altissima | White snakeroot | |
| Agalinis edwardsiana | Plateau false foxglove Plateau agalinis Plateau gerardia Plateau false-foxglove | |
| Ageratina havanensis | Havana snakeroot Mistflower Shrubby boneset White mistflower White shrub mistflower | |
| Agalinis heterophylla | Prairie false foxglove Prairie agalinis Prairie false-foxglove | |
| Agrostis hyemalis | Winter bentgrass | |
| Agave parryi ssp. neomexicana | Parry's agave New Mexico agave | |
| Agave univittata | Maguey mezortillo Thorncrest century plant | |
| Allium canadense | Meadow garlic Wild garlic Wild onion | |
| Allium canadense var. mobilense | Meadow garlic Wild onion | |
| Allium drummondii | Drummond's onion Wild Garlic Drummond wild onion | |
| Aloysia gratissima | Whitebrush Bee-brush White-brush Common bee-brush Beebrush Privet lippia | |
| Allowissadula holosericea | Chisos Mountain false Indianmallow Chisos Mtn. False Indian-mallow Velvet-leaf Mallow | |
| Aloysia macrostachya | Rio Grande beebrush Woolly Bee-brush | |
| Ambrosia artemisiifolia | Annual ragweed Short ragweed | |
| Ampelopsis arborea | Peppervine | |
| Amsonia ciliata | Fringed bluestar Bluestar Blue funnel lily Texas bluestar | |
| Ammannia coccinea | Valley redstem Scarlet tooth-cup | |
| Amphiachyris dracunculoides | Prairie broomweed Broomweed | |
| Amorpha fruticosa | Indigo bush False indigo bush False indigo Desert false indigo | |
| Amyris madrensis | Mountain torchwood Shrub Amyris | |
| Ambrosia psilostachya | Cuman ragweed Western ragweed Perennial ragweed Common ragweed | |
| Amorpha roemeriana | Roemer's false indigo | |
| Amblyolepis setigera | Huisache daisy Butterfly daisy Honey daisy | |
| Ambrosia trifida var. texana | Giant Ragweed Texan great ragweed | |
| Anemone berlandieri | Tenpetal thimbleweed Ten-petaled anemone Wind-flower | |
| Androstephium caeruleum | Androstephium Blue funnel lily Blue Funnel-lily Fragrant lily Funnel-Flower | |
| Anemone edwardsiana | Edwards Plateau thimbleweed Two-flowered Anemone | |
| Andropogon gerardii | Big bluestem Turkeyfoot | |
| Andropogon glomeratus | Bushy bluestem Brushy bluestem | |
| Anemia mexicana | Mexican fern Mexican Flowering Fern | |
| Anisacanthus quadrifidus var. wrightii | Flame acanthus Hummingbird bush Wright's desert honeysuckle Wright acanthus Mexican flame Wright's Mexican flame | |
| Aphanostephus riddellii | Lazy Daisy Riddell's dozedaisy | |
| Aphanostephus skirrhobasis | Lazy daisy Arkansas lazy daisy Arkansas dozedaisy | |
| Aquilegia canadensis | Eastern red columbine Wild red columbine | |
| scientific name | common name(s) | image gallery |