Vascular Plants of North Carolina
Account for Appalachian Snakeroot - Ageratina roanensis   (Small) E.E. Lamont
Members of Asteraceae:
Members of Ageratina with account distribution info or public map:
Google Images
Section 6 » Family Asteraceae
Author(Small) E.E. Lamont
DistributionMountains only, at middle to high elevations.

Northwestern VA and eastern KY, south to northern GA and possibly northeastern AL.
AbundanceWeakley (2018) says often abundant at high elevations.
HabitatMoist to mesic morthern hardwood forests and spruce-fir forests.
PhenologyFlowering and fruiting August-October.
IdentificationOur 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 CommentsSometimes 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 RankS3
Global RankG5T3T4 [G3G4]
State Status
US Status
County Map - click on a county to view source of record.
Photo Gallery
B.A. SorrieBlue Ridge Parkway, Aug 2014. AshePhoto_natural
Select a source
Select an occurrence type