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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 | |
| Abronia angustifolia | Purple sand verbena Narrow-leaf sand-verbena | |
| Abutilon fruticosum | Indian mallow Texas Indian mallow | |
| Abutilon incanum | Indian mallow Pelotazo Shrubby Indian mallow | |
| Abronia villosa | Desert sand verbena Desert sand-verbena Desert sandverbena | |
| Acacia berlandieri | Guajillo Berlandier acacia Thornless Catclaw Mimosa Catclaw Round-flowered Catclaw Huajillla Matoral | |
| 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 | |
| Achillea millefolium | Common yarrow Yarrow Milfoil Western yarrow | |
| Achillea millefolium var. occidentalis | Western yarrow Woolly yarrow White yarrow | |
| Acalypha monostachya | Round copperleaf | |
| Acer negundo | Ash-leaf maple Ash-leaved maple Box elder Boxelder Fresno de guajuco | |
| Acmella oppositifolia var. repens | Oppositeleaf spotflower Opposite-leaf spotflower | |
| 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 | |
| Acacia schaffneri | Schaffner's wattle Twisted acacia | |
| Adiantum capillus-veneris | Southern maidenhair fern Common maidenhair fern Maidenhair fern Venus hair fern | |
| Adolphia infesta | Junco | |
| Aesculus pavia var. pavia | Scarlet buckeye Red buckeye Southern buckeye Firecracker plant | |
| Agalinis edwardsiana | Plateau false foxglove Plateau agalinis Plateau gerardia Plateau false-foxglove | |
| Agalinis fasciculata | Beach false foxglove | |
| Ageratina havanensis | Havana snakeroot Mistflower Shrubby boneset White mistflower White shrub mistflower | |
| Agalinis heterophylla | Prairie false foxglove Prairie agalinis Prairie false-foxglove | |
| Agastache micrantha | White giant hyssop | |
| 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 | |
| Allowissadula holosericea | Chisos Mountain false Indianmallow Chisos Mtn. False Indian-mallow Velvet-leaf Mallow | |
| Allium praecox | Early onion | |
| Allium stellatum | Autumn onion Prairie onion | |
| Ampelopsis arborea | Peppervine | |
| Amorpha canescens | Leadplant Leadplant amorpha Prairie shoestring | |
| Ambrosia confertiflora | Weakleaf bur ragweed | |
| Amphiachyris dracunculoides | Prairie broomweed Broomweed | |
| Amorpha fruticosa | Indigo bush False indigo bush False indigo Desert false indigo | |
| Amaranthus greggii | Gregg's amaranth | |
| Amsonia longiflora | Tubular Bluestar Trumpet Slimpod | |
| Ambrosia psilostachya | Cuman ragweed Western ragweed Perennial ragweed Common ragweed | |
| Amsonia tabernaemontana | Eastern bluestar Blue dogbane Willow amsonia Woodland bluestar | |
| Ambrosia trifida var. texana | Giant Ragweed Texan great ragweed | |
| Anemone berlandieri | Tenpetal thimbleweed Ten-petaled anemone Wind-flower | |
| 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 | Golden columbine Yellow columbine | |
| Argemone albiflora | Bluestem pricklypoppy White pricklypoppy | |
| scientific name | common name(s) | image gallery |