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| scientific name | common name(s) | image gallery |
| Abronia fragrans | Fragrant verbena Sand verbena Snowball Snowball sand verbena Sweet sand-verbena | |
| Acacia angustissima | Prairie acacia Fern acacia Prairie wattle Whiteball acacia | |
| Acer barbatum | Southern sugar maple Florida maple Caddo maple Rock maple | |
| Acacia berlandieri | Guajillo Berlandier acacia Thornless Catclaw Mimosa Catclaw Round-flowered Catclaw Huajillla Matoral | |
| Acacia constricta | Whitethorn acacia White-thorn acacia Mescat acacia Mescat wattle Whitethorn Vara Prieta Chaparro Prieto | |
| 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 | |
| Acer leucoderme | Chalk maple | |
| Achillea millefolium | Common yarrow Yarrow Milfoil Western yarrow | |
| Aesculus pavia var. pavia | Scarlet buckeye Red buckeye Southern buckeye Firecracker plant | |
| Agave americana | American century plant Century plant | |
| Agastache foeniculum | Blue giant hyssop Blue giant-hyssop Fragrant giant hyssop Lavender hyssop Anise hyssop | |
| Ageratina havanensis | Havana snakeroot Mistflower Shrubby boneset White mistflower White shrub mistflower | |
| Aloysia gratissima | Whitebrush Bee-brush White-brush Common bee-brush Beebrush Privet lippia | |
| Aloysia macrostachya | Rio Grande beebrush Woolly Bee-brush | |
| Amorpha fruticosa | Indigo bush False indigo bush False indigo Desert false indigo | |
| Anisacanthus thurberi | Chuparosa Desert honeysuckle Thurber's desert honeysuckle | |
| Aquilegia canadensis | Eastern red columbine Wild red columbine | |
| Artemisia dracunculus | Tarragon | |
| 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 | |
| Aristolochia tomentosa | Woolly dutchman's pipe Common dutchmanspipe | |
| Artemisia vulgaris | Common wormwood Mugwort | |
| Asclepias syriaca | Common milkweed | |
| Asclepias texana | Texas milkweed White milkweed | |
| Asimina triloba | Pawpaw Common paw paw Indian banana | |
| Asclepias tuberosa | Butterflyweed Butterfly milkweed Orange milkweed Pleurisy root | |
| Asclepias viridis | Green antelopehorn Green milkweed | |
| Atriplex canescens | Chamiso Four-wing saltbush Fourwing saltbush Wingscale | |
| Atriplex confertifolia | Shadscale Spiny saltbush Shadscale saltbush Hop sage | |
| Betula nigra | River birch Red birch | |
| Bignonia capreolata | Crossvine | |
| Bouteloua curtipendula | Sideoats grama | |
| Bouteloua gracilis | Blue grama | |
| Bouchea linifolia | Flaxleaf bouchea Groovestem bouchea | |
| Callicarpa americana | American beautyberry French mulberry | |
| Capsicum annuum | Chile pequin Chile petin Bird pepper Turkey pepper Cayenne pepper | |
| Calocedrus decurrens | Incense cedar Incense-cedar | |
| Calliandra eriophylla | Pink fairyduster Fairyduster Mesquitilla Mock mesquite | |
| Callirhoe involucrata | Winecup Purple poppy mallow | |
| Calyptocarpus vialis | Straggler daisy Horseherb Hierba del caballo Lawnflower | |
| Centaurea americana | American star-thistle Basket-Flower Star thistle Shaving brush American basket-flower | |
| Cercocarpus montanus var. argenteus | Silver mountain mahogany Mountain mahogany True mountain mahogany Silverleaf mountain mahogany | |
| Celtis occidentalis | Common hackberry Nettle tree | |
| Cephalanthus occidentalis | Common buttonbush Buttonbush Button willow | |
| Celastrus scandens | American bittersweet | |
| Chasmanthium latifolium | Inland sea oats Indian wood oats Wild oats River oats Flathead oats Upland Oats Upland Sea Oats | |
| Chilopsis linearis | Desert willow Flowering willow Willow-leaved catalpa Trumpet flower | |
| Chrysactinia mexicana | Damianita | |
| Chionanthus virginicus | White fringetree Fringe tree Grancy Graybeard | |
| scientific name | common name(s) | image gallery |