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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 fruticosum | Indian mallow Texas Indian mallow | |
| Abutilon incanum | Indian mallow Pelotazo Shrubby Indian mallow | |
| Acacia berlandieri | Guajillo Berlandier acacia Thornless Catclaw Mimosa Catclaw Round-flowered Catclaw Huajillla Matoral | |
| Acacia farnesiana | Huisache Sweet acacia Mealy wattle | |
| Acmella oppositifolia var. repens | Oppositeleaf spotflower Opposite-leaf spotflower | |
| Acalypha phleoides | Shrubby copperleaf Three-seeded mercury | |
| Acacia rigidula | Blackbrush acacia Blackbrush Catclaw Chaparro prieto Gavia | |
| Acacia roemeriana | Roundflower catclaw Round-flower catclaw Roemer acacia Catclaw Roemer’s acacia Catclaw acacia | |
| Agalinis edwardsiana | Plateau false foxglove Plateau agalinis Plateau gerardia Plateau false-foxglove | |
| Agalinis fasciculata | Beach false foxglove | |
| Agave havardiana | Havard's century plant Havard agave | |
| Ageratina havanensis | Havana snakeroot Mistflower Shrubby boneset White mistflower White shrub mistflower | |
| Agalinis heterophylla | Prairie false foxglove Prairie agalinis Prairie false-foxglove | |
| Aletris aurea | Golden colicroot Colicroot Star grass Yellow colic root | |
| Allium canadense | Meadow garlic Wild garlic Wild onion | |
| Allium drummondii | Drummond's onion Wild Garlic Drummond wild onion | |
| Allowissadula holosericea | Chisos Mountain false Indianmallow Chisos Mtn. False Indian-mallow Velvet-leaf Mallow | |
| Ampelopsis arborea | Peppervine | |
| Ambrosia confertiflora | Weakleaf bur ragweed | |
| Amorpha fruticosa | Indigo bush False indigo bush False indigo Desert false indigo | |
| Amaranthus greggii | Gregg's amaranth | |
| Ambrosia trifida | Great ragweed Giant ragweed | |
| Ambrosia trifida var. texana | Giant Ragweed Texan great ragweed | |
| Anemone berlandieri | Tenpetal thimbleweed Ten-petaled anemone Wind-flower | |
| Andropogon glomeratus | Bushy bluestem Brushy bluestem | |
| Andropogon ternarius | Splitbeard bluestem | |
| Aquilegia canadensis | Eastern red columbine Wild red columbine | |
| Aquilegia chrysantha var. chaplinei | Chaplin's yellow columbine Chaplin's golden columbine Chaplin's columbine Chapline columbine Guadalupe Mountain columbine | |
| Aquilegia chrysantha var. hinckleyana | Hinckley's golden columbine Yellow columbine Hinckley columbine Capote columbine | |
| Aquilegia longissima | Longspur columbine Longspur yellow columbine | |
| Argemone aenea | Golden pricklypoppy | |
| Argemone albiflora | Bluestem pricklypoppy White pricklypoppy | |
| Argemone aurantiaca | Texas pricklypoppy | |
| Aristida longespica | Slimspike threeawn Kearney's three-awn red three-awn slender three-awn | |
| Aristida oligantha | Prairie threeawn Oldfield (Prairie) 3-awn Oldfield threeawn | |
| Arabis petiolaris | Brazos rockcress Rock-cress Brazos rock-cress | |
| Aristida purpurea | Purple threeawn Purple 3-awn Purple three-awn Red threeawn | |
| Argemone sanguinea | Red prickly poppy Red pricklypoppy Rose prickly poppy | |
| Asclepias asperula | Spider milkweed Antelope horns Green-flowered milkweed Spider antelope-horns | |
| Astragalus crassicarpus | Groundplum milkvetch Ground plum | |
| Asclepias oenotheroides | Zizotes milkweed Hierba de Zizotes Longhorn milkweed Side-cluster milkweed Primrose milkweed Lindheimer's milkweed | |
| Asimina parviflora | Smallflower pawpaw Small-flower pawpaw Dwarf pawpaw | |
| Atriplex matamorensis | Matamoros saltbush | |
| Baccharis bigelovii | Bigelow's false willow | |
| Batis maritima | Seaside saltwort Turtleweed | |
| Bacopa monnieri | Coastal Water-hyssop Herb-of-grace Water hyssop | |
| Baccharis neglecta | False Willow Jara dulce Poverty Weed Roosevelt Weed | |
| Bahia pedata | Bluntscale bahia | |
| Baptisia sphaerocarpa | Bush pea Green wild indigo Yellow wild indigo Yellow wisteria | |
| scientific name | common name(s) | image gallery |