Vascular Plants of North Carolina
Account for Lesser Snakeroot - Ageratina aromatica   (L.) Spach
Members of Asteraceae:
Members of Ageratina with account distribution info or public map:
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Section 6 » Order Asterales » Family Asteraceae
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Author(L.) Spach
DistributionEssentially throughout the state, but perhaps absent from northern outer Coastal Plain and northern Mountains.

MA to OH, south to northern FL and southeastern LA.
AbundanceFairly common to common in most of the state, except rare in the northwestern corner, and also rare in the far eastern counties.
HabitatDry to mesic, occasionally xeric, pine-oak-hickory woodlands, Longleaf Pine--Wiregrass woodlands and savannas, rocky slopes, outcrops, glades, barrens. It is fire-tolerant.
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 in any Eupatorium species, a very useful clue. White Snakeroot (A. altissima) is robust, 2-4 feet tall (vs. 1-2.5 feet tall in Lesser Snakeroot), and has larger leaves that are sharply toothed (vs. bluntly toothed or crenate in Lesser Snakeroot).
Taxonomic CommentsFormerly known as Eupatorium aromaticum.

Other Common Name(s)Small-leaved White Snakeroot -- a terrible name, as White Snakeroot is typically used for A. altissima.
State RankS5
Global RankG5
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B.A. SorrieSame data. ScotlandPhoto_natural
B.A. SorrieSandhills Game Land, loamy sand flat on Strausburg Road, Oct 2009. ScotlandPhoto_natural
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