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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 | |
| Acacia farnesiana | Huisache Sweet acacia Mealy wattle | |
| Acleisanthes longiflora | Angel trumpets Angel's trumpets | |
| Achillea millefolium | Common yarrow Yarrow Milfoil Western yarrow | |
| Acalypha ostryifolia | Pineland threeseed mercury Hop-hornbeam copperleaf | |
| Acalypha phleoides | Shrubby copperleaf Three-seeded mercury | |
| Acalypha radians | Cardinal's feather Cardinal feather | |
| Acacia roemeriana | Roundflower catclaw Round-flower catclaw Roemer acacia Catclaw Roemer’s acacia Catclaw acacia | |
| Acer rubrum var. trilobum | Trident maple Trident red maple | |
| Acalypha virginica | Virginia threeseed mercury | |
| Agalinis edwardsiana | Plateau false foxglove Plateau agalinis Plateau gerardia Plateau false-foxglove | |
| Ageratina havanensis | Havana snakeroot Mistflower Shrubby boneset White mistflower White shrub mistflower | |
| Alternanthera caracasana | Washerwoman | |
| Allium canadense var. canadense | Canada onion Meadow garlic Wild onion | |
| Allium canadense var. fraseri | Fraser meadow garlic Fraser meadow garlic | |
| Allionia choisyi | Annual windmills | |
| 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 | |
| Allionia incarnata | Trailing windmills Trailing four o'clock Pink windmills Trailing allionia | |
| Amphiachyris amoena | Texas broomweed | |
| Ambrosia artemisiifolia | Annual ragweed Short ragweed | |
| Ampelopsis arborea | Peppervine | |
| Amsonia ciliata | Fringed bluestar Bluestar Blue funnel lily Texas bluestar | |
| Ampelopsis cordata | Heartleaf peppervine Heart-leaf ampelopsis | |
| Amphiachyris dracunculoides | Prairie broomweed Broomweed | |
| Amorpha fruticosa | Indigo bush False indigo bush False indigo Desert false indigo | |
| Amsonia longiflora | Tubular Bluestar Trumpet Slimpod | |
| Amaranthus palmeri | Carelessweed | |
| Amaranthus scleropoides | Bonebract amaranth | |
| Amaranthus spinosus | Spiny amaranth Thorny pigweed | |
| Ambrosia trifida var. texana | Giant Ragweed Texan great ragweed | |
| Anemone berlandieri | Tenpetal thimbleweed Ten-petaled anemone Wind-flower | |
| Anemone caroliniana | Carolina anemone Carolina thimbleweed Southern thimbleweed | |
| Andropogon glomeratus | Bushy bluestem Brushy bluestem | |
| Apocynum cannabinum | Indian hemp Prairie dogbane Dogbane Hemp dogbane | |
| Aphanostephus ramosissimus | Plains dozedaisy Lazy daisy | |
| Argemone albiflora | Bluestem pricklypoppy White pricklypoppy | |
| Argemone aurantiaca | Texas pricklypoppy | |
| Aristolochia erecta | Swanflower | |
| Argythamnia humilis var. humilis | Low Silverbush Low Wild Mercury | |
| Artemisia ludoviciana | Louisiana artemisia Louisiana sage White sage Prairie sage Silver sage White sagebrush Louisiana wormwood Silver wormwood Louisiana sagewort Gray sagewort Cudweed sagewort Mugwort wormwood | |
| Arabis petiolaris | Brazos rockcress Rock-cress Brazos rock-cress | |
| Aristida purpurea | Purple threeawn Purple 3-awn Purple three-awn Red threeawn | |
| Aristida purpurea var. purpurea | Purple threeawn Red threeawn | |
| Argythamnia simulans | Plateau silverbush Tall wild-mercury | |
| Arbutus xalapensis | Texas madrone Madrone Naked indian Manzanita | |
| Asclepias asperula | Spider milkweed Antelope horns Green-flowered milkweed Spider antelope-horns | |
| Astragalus crassicarpus | Groundplum milkvetch Ground plum | |
| scientific name | common name(s) | image gallery |