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| scientific name | common name(s) | image gallery |
| Abutilon incanum | Indian mallow Pelotazo Shrubby Indian mallow | |
| Acer grandidentatum | Bigtooth maple Big-toothed maple Canyon maple | |
| Acalypha radians | Cardinal's feather Cardinal feather | |
| Acacia rigidula | Blackbrush acacia Blackbrush Catclaw Chaparro prieto Gavia | |
| Adiantum capillus-veneris | Southern maidenhair fern Common maidenhair fern Maidenhair fern Venus hair fern | |
| Aesculus pavia | Scarlet Buckeye Red buckeye Firecracker plant | |
| Aesculus pavia var. flavescens | Texas yellow buckeye Yellow woolly buckeye Pale buckeye Plateau yellow buckeye | |
| Aesculus pavia var. pavia | Scarlet buckeye Red buckeye Southern buckeye Firecracker plant | |
| Agave americana | American century plant Century plant | |
| Agave havardiana | Havard's century plant Havard agave | |
| Ageratina havanensis | Havana snakeroot Mistflower Shrubby boneset White mistflower White shrub mistflower | |
| Agave univittata | Maguey mezortillo Thorncrest century plant | |
| Allium canadense | Meadow garlic Wild 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 | |
| Amorpha fruticosa | Indigo bush False indigo bush False indigo Desert false indigo | |
| Amorpha roemeriana | Roemer's false indigo | |
| Anemone edwardsiana | Edwards Plateau thimbleweed Two-flowered Anemone | |
| Andropogon gerardii | Big bluestem Turkeyfoot | |
| Andropogon glomeratus | Bushy bluestem Brushy bluestem | |
| 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 | |
| Aquilegia canadensis | Eastern red columbine Wild red columbine | |
| Aquilegia chrysantha var. hinckleyana | Hinckley's golden columbine Yellow columbine Hinckley columbine Capote columbine | |
| Argemone albiflora | Bluestem pricklypoppy White pricklypoppy | |
| Arisaema dracontium | Green dragon Dragonroot Greendragon | |
| Aristida oligantha | Prairie threeawn Oldfield (Prairie) 3-awn Oldfield threeawn | |
| Artemisia palmeri | San Diego sagebrush San Diego sagewort | |
| Arnoglossum plantagineum | Groovestem Indian plaintain Indian plantain Prairie plantain Prairie Indian plantain | |
| Aristida purpurea | Purple threeawn Purple 3-awn Purple three-awn Red threeawn | |
| Aristida purpurea var. purpurea | Purple threeawn Red threeawn | |
| Asclepias asperula | Spider milkweed Antelope horns Green-flowered milkweed Spider antelope-horns | |
| Asclepias incarnata | Swamp milkweed Pink Milkweed | |
| Asclepias oenotheroides | Zizotes milkweed Hierba de Zizotes Longhorn milkweed Side-cluster milkweed Primrose milkweed Lindheimer's milkweed | |
| Asclepias tuberosa | Butterflyweed Butterfly milkweed Orange milkweed Pleurisy root | |
| Asclepias viridis | Green antelopehorn Green milkweed | |
| Bauhinia lunarioides | Anacacho orchid tree Anacacho bauhinia Orchid tree Texas plume | |
| Bacopa monnieri | Coastal Water-hyssop Herb-of-grace Water hyssop | |
| Baccharis neglecta | False Willow Jara dulce Poverty Weed Roosevelt Weed | |
| Berlandiera betonicifolia | Texas greeneyes Broochflower | |
| Berlandiera lyrata | Chocolate daisy Chocolate flower Lyreleaf greeneyes Green-Eyed lyre leaf | |
| Bignonia capreolata | Crossvine | |
| Bouteloua curtipendula | Sideoats grama | |
| Bouteloua dactyloides | Buffalograss Buffalo grass | |
| Bouchetia erecta | Painted Tongue Paintedtongue | |
| Bothriochloa laguroides ssp. torreyana | Silver Beard Grass Silver beardgrass Silver Bluestem | |
| Bouchea linifolia | Flaxleaf bouchea Groovestem bouchea | |
| Bouteloua rigidiseta | Texas grama | |
| scientific name | common name(s) | image gallery |