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| scientific name | common name(s) | image gallery |
| Abronia ameliae | Amelia's sand verbena Heart’s delight Amelia's sand-verbena Sand verbena | |
| Abutilon hypoleucum | Rio Grande abutilon White-leaf indian-mallow Whiteleaf Indian mallow | |
| Acacia berlandieri | Guajillo Berlandier acacia Thornless Catclaw Mimosa Catclaw Round-flowered Catclaw Huajillla Matoral | |
| Acacia farnesiana | Huisache Sweet acacia Mealy wattle | |
| Acacia greggii | Catclaw acacia Gregg acacia Long-flower catclaw Una de gato | |
| Acer grandidentatum | Bigtooth maple Big-toothed maple Canyon maple | |
| Acacia greggii var. wrightii | Catclaw acacia Catclaw Wright acacia | |
| Achnatherum hymenoides | Indian ricegrass Indian Millet Sandgrass | |
| Acacia rigidula | Blackbrush acacia Blackbrush Catclaw Chaparro prieto Gavia | |
| Acacia roemeriana | Roundflower catclaw Round-flower catclaw Roemer acacia Catclaw Roemer’s acacia Catclaw acacia | |
| Acer rubrum var. drummondii | Drummond's maple Drummond red maple Swamp maple | |
| Aesculus glabra var. arguta | Ohio buckeye White buckeye Texas buckeye | |
| Aesculus pavia | Scarlet Buckeye Red buckeye Firecracker plant | |
| Agave americana | American century plant Century plant | |
| Ageratina havanensis | Havana snakeroot Mistflower Shrubby boneset White mistflower White shrub mistflower | |
| Agave parryi ssp. neomexicana | Parry's agave New Mexico agave | |
| Aloysia gratissima | Whitebrush Bee-brush White-brush Common bee-brush Beebrush Privet lippia | |
| Ampelopsis cordata | Heartleaf peppervine Heart-leaf ampelopsis | |
| Amorpha fruticosa | Indigo bush False indigo bush False indigo Desert false indigo | |
| Amblyolepis setigera | Huisache daisy Butterfly daisy Honey daisy | |
| Amyris texana | Chapotillo Texas torchwood | |
| Andropogon gerardii | Big bluestem Turkeyfoot | |
| Andropogon glomeratus | Bushy bluestem Brushy bluestem | |
| Andropogon hallii | Sand bluestem | |
| Anisacanthus puberulus | Dwarf desert honeysuckle Pinky Anisacanthus Pinkie Anisacanth | |
| Andropogon virginicus | Broomsedge bluestem Broom-sedge | |
| Aquilegia canadensis | Eastern red columbine Wild red columbine | |
| Aquilegia longissima | Longspur columbine Longspur yellow columbine | |
| Argemone albiflora ssp. texana | Bluestem pricklypoppy White pricklypoppy | |
| Artemisia filifolia | Sand sagebrush Silver sagebrush Silvery wormwood Sand sage | |
| Aristolochia pentandra | Marsh's dutchman's pipe | |
| Argemone polyanthemos | Annual pricklepoppy Bluestem pricklepoppy Bluestem prickly poppy Crested pricklypoppy Pricklypoppy Thistle poppy White prickly poppy White pricklypoppy | |
| Argemone sanguinea | Red prickly poppy Red pricklypoppy Rose prickly poppy | |
| Aristolochia tomentosa | Woolly dutchman's pipe Common dutchmanspipe | |
| Arbutus xalapensis | Texas madrone Madrone Naked indian Manzanita | |
| Asimina parviflora | Smallflower pawpaw Small-flower pawpaw Dwarf pawpaw | |
| Asclepias tuberosa | Butterflyweed Butterfly milkweed Orange milkweed Pleurisy root | |
| Atriplex canescens | Chamiso Four-wing saltbush Fourwing saltbush Wingscale | |
| Baileya multiradiata | Desert marigold Showy desert marigold Paper daisy Desert baileya | |
| Berlandiera betonicifolia | Texas greeneyes Broochflower | |
| Berlandiera lyrata | Chocolate daisy Chocolate flower Lyreleaf greeneyes Green-Eyed lyre leaf | |
| Betula nigra | River birch Red birch | |
| Bignonia capreolata | Crossvine | |
| Bothriochloa barbinodis | Cane bluestem | |
| Bouteloua curtipendula | Sideoats grama | |
| Bouteloua dactyloides | Buffalograss Buffalo grass | |
| Bouteloua eriopoda | Black grama | |
| Borrichia frutescens | Bushy seaside tansy Bushy seaside-tansy Ox-eye daisy Sea daisy Sea ox-eye | |
| Bouteloua gracilis | Blue grama | |
| Bouteloua rigidiseta | Texas grama | |
| scientific name | common name(s) | image gallery |