| Author | (Small) E.E. Lamont | |
| Distribution | Mountains only, at middle to high elevations.
Northwestern VA and eastern KY, south to northern GA and possibly northeastern AL. | |
| Abundance | Weakley (2018) says often abundant at high elevations. | |
| Habitat | Moist to mesic morthern hardwood forests and spruce-fir forests. | |
| Phenology | Flowering and fruiting August-October. | |
| Identification | Our species of Ageratina can be told from the closely related genus Eupatorium by the greater number of florets per head [12-34 vs. 14 or fewer (most species only 5)]. In the field the heads are brighter white in Ageratina than any Eupatorium, a very useful clue. White Snakeroot (A. altissima) can be told from Appalachian Snakeroot by fewer florets per head (12-25 vs. 20-34) and shorter head bracts (3-5 mm vs. 5-7). | |
| Taxonomic Comments | Sometimes treated as a full species A. roanensis (Weakley 2020, without supporting data), though Weakley (2018) considered it as a variety.
| |
| Other Common Name(s) | None | |
| State Rank | S3 | |
| Global Rank | G5T3T4 [G3G4] | |
| State Status | | |
| US Status | | |
| USACE-agcp | | |
| USACE-emp | | |
