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| scientific name | common name(s) | image gallery |
| Aesculus pavia | Scarlet Buckeye Red buckeye Firecracker plant | |
| Agave havardiana | Havard's century plant Havard agave | |
| 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 | |
| Amblyolepis setigera | Huisache daisy Butterfly daisy Honey daisy | |
| Anisacanthus quadrifidus var. wrightii | Flame acanthus Hummingbird bush Wright's desert honeysuckle Wright acanthus Mexican flame Wright's Mexican flame | |
| Aquilegia chrysantha var. hinckleyana | Hinckley's golden columbine Yellow columbine Hinckley columbine Capote columbine | |
| Aquilegia formosa | Western columbine Crimson columbine Scarlet columbine Red columbine | |
| Asclepias asperula | Spider milkweed Antelope horns Green-flowered milkweed Spider antelope-horns | |
| scientific name | common name(s) | image gallery |