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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 | |
| Aquilegia chrysantha var. hinckleyana | Hinckley's golden columbine Yellow columbine Hinckley columbine Capote columbine | |
| Argemone albiflora | Bluestem pricklypoppy White pricklypoppy | |
| Argemone albiflora ssp. texana | Bluestem pricklypoppy White pricklypoppy | |
| Arenaria benthamii | Hilly sandwort | |
| Argyrochosma dealbata | False Cloak Fern Powdery Cloak Fern Powdery false cloak fern | |
| Arisaema dracontium | Green dragon Dragonroot Greendragon | |
| Argythamnia humilis var. humilis | Low Silverbush Low Wild Mercury | |
| Aristida oligantha | Prairie threeawn Oldfield (Prairie) 3-awn Oldfield threeawn | |
| Arabis petiolaris | Brazos rockcress Rock-cress Brazos rock-cress | |
| 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. nealleyi | Blue threeawn | |
| Aristida purpurea var. purpurea | Purple threeawn Red threeawn | |
| Arbutus xalapensis | Texas madrone Madrone Naked indian Manzanita | |
| Asclepias asperula | Spider milkweed Antelope horns Green-flowered milkweed Spider antelope-horns | |
| Asclepias asperula ssp. capricornu | Antelopehorns Antelope horns | |
| Astragalus crassicarpus | Groundplum milkvetch Ground plum | |
| Asclepias incarnata | Swamp milkweed Pink Milkweed | |
| Asclepias oenotheroides | Zizotes milkweed Hierba de Zizotes Longhorn milkweed Side-cluster milkweed Primrose milkweed Lindheimer's milkweed | |
| Asclepias texana | Texas milkweed White milkweed | |
| Asclepias tuberosa | Butterflyweed Butterfly milkweed Orange milkweed Pleurisy root | |
| Asclepias viridis | Green antelopehorn Green milkweed | |
| Atriplex confertifolia | Shadscale Spiny saltbush Shadscale saltbush Hop sage | |
| 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 | |
| Bacopa rotundifolia | Disc Water-hyssop Disk waterhyssop | |
| Berlandiera betonicifolia | Texas greeneyes Broochflower | |
| Berlandiera lyrata | Chocolate daisy Chocolate flower Lyreleaf greeneyes Green-Eyed lyre leaf | |
| Bernardia myricifolia | Mouse Ears Mouse's eye | |
| Berchemia scandens | Alabama supple-jack Alabama supplejack Rattan-vine | |
| Bignonia capreolata | Crossvine | |
| Bidens frondosa | Devil's beggartick Spanish needles | |
| Bidens laevis | Smooth beggartick Smooth bidens Smooth bur marigold Larger bur marigold | |
| Boerhavia coccinea | Scarlet spiderling | |
| Bouteloua curtipendula | Sideoats grama | |
| Bouteloua dactyloides | Buffalograss Buffalo grass | |
| Bouchetia erecta | Painted Tongue Paintedtongue | |
| Bouteloua gracilis | Blue grama | |
| Bouteloua hirsuta | Hairy grama | |
| Bouteloua hirsuta var. pectinata | Hairy grama Tall grama | |
| Bothriochloa laguroides ssp. torreyana | Silver Beard Grass Silver beardgrass Silver Bluestem | |
| Bouchea linifolia | Flaxleaf bouchea Groovestem bouchea | |
| Bothriochloa longipaniculata | Longspike beardgrass Longspike Silver Bluestem | |
| Bouteloua rigidiseta | Texas grama | |
| Bouteloua trifida | Red grama | |
| Brickellia cylindracea | Brickell-Bush Brickellbush Gravelbar brickellbush | |
| Buddleja marrubiifolia | Woolly butterflybush Butterfly bush Woolly Butterfly-bush | |
| Buddleja racemosa | Wand butterfly-bush Wand butterflybush | |
| Buddleja scordioides | Escobilla butterflybush Escobilla | |
| scientific name | common name(s) | image gallery |