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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 | |
| scientific name | common name(s) | image gallery |