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| scientific name | common name(s) | image gallery |
| Agastache scrophulariifolia | Purple giant hyssop Purple giant-hyssop | |
| Agastache urticifolia | Nettleleaf giant hyssop Nettle-leaf Horsemint | |
| Agave americana | American century plant Century plant | |
| Agave deserti | Desert agave Desert century plant Century plant | |
| Agave glomeruliflora | Chisos Agave Chisos Mountains Century Plant | |
| Agave gracilipes | Slimfoot century plant | |
| Agave havardiana | Havard's century plant Havard agave | |
| Agave lechuguilla | Lechuguilla | |
| Agave palmeri | Palmer's century plant Palmer agave Blue century plant | |
| Agave parryi | Parry's agave Century plant Parry agave | |
| Agave parryi ssp. neomexicana | Parry's agave New Mexico agave | |
| Agave parryi ssp. parryi | Century plant Mescal Parry's agave Rough agave | |
| Agave shawii | Coastal agave Boundary century plant Shaw's century plant | |
| Agave univittata | Maguey mezortillo Thorncrest century plant | |
| Agave utahensis | Utah agave | |
| Agave utahensis var. nevadensis | Nevada agave | |
| Ageratina altissima | White snakeroot | |
| Ageratina altissima var. altissima | White snakeroot | |
| Ageratina havanensis | Havana snakeroot Mistflower Shrubby boneset White mistflower White shrub mistflower | |
| Ageratina jucunda | Hammock snakeroot | |
| Ageratina occidentalis | Western snakeroot Western thoroughwort | |
| Ageratina wrightii | White mistflower Wright's snakeroot White boneset White ageratum | |
| Agoseris aurantiaca | Orange agoseris | |
| Agoseris glauca | Pale agoseris Pale mountain dandelion False dandelion | |
| Agoseris heterophylla | Annual agoseris | |
| Agrimonia gryposepala | Tall hairy agrimony Agrimony | |
| Agrimonia parviflora | Harvest lice Small-flowered Agrimony Southern Agrimony Swamp Agrimony | |
| Agrimonia pubescens | Downy Agrimony Soft Agrimony Hairy Agrimony | |
| Agrimonia striata | Roadside agrimony | |
| Agrostis exarata | Spike bentgrass Spiked bent Spike red top | |
| Agrostis hyemalis | Winter bentgrass | |
| Agrostis mertensii | Northern bentgrass | |
| Agrostis perennans | Autumn bentgrass Upland bentgrass | |
| Agrostis scabra | Fly-away grass Rough bent Rough bentgrass Ticklegrass | |
| Aletris aurea | Golden colicroot Colicroot Star grass Yellow colic root | |
| Aletris farinosa | White colicroot Colic root Unicorn root | |
| Aletris lutea | Yellow colicroot Yellow Colic-root | |
| Aletris obovata | Southern colicroot Blunt-leaved colic root | |
| Aliciella subnuda | Coral gilia | |
| Alisma subcordatum | American water plantain | |
| Alisma triviale | Northern water plantain | |
| Allenrolfea occidentalis | Iodinebush Pickleweed | |
| Allionia choisyi | Annual windmills | |
| Allionia incarnata | Trailing windmills Trailing four o'clock Pink windmills Trailing allionia | |
| Allium acuminatum | Tapertip onion | |
| Allium amplectens | Narrowleaf onion | |
| Allium brevistylum | Shortstyle onion | |
| Allium burdickii | Narrowleaf wild leek | |
| Allium campanulatum | Dusky onion | |
| Allium canadense | Meadow garlic Wild garlic Wild onion | |
| scientific name | common name(s) | image gallery |