Vascular Plants of North Carolina
Account for Small-flower Thoroughwort - Eupatorium semiserratum   de Candolle
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Section 6 » Order Asterales » Family Asteraceae
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Authorde Candolle
DistributionMost of the Coastal Plain and Sandhills; rare in the lower Piedmont.

Coastal Plain, southeastern VA to northern FL and eastern TX, north in the Mississippi Embayment to southeastern MO and western TN. Disjunct to central TN.
AbundanceFairly common to common in most of the Coastal Plain and Sandhills, but very rare in the northeastern portions (such as in counties bordering Pamlico and Albemarle sounds). Barely extends into the southeastern Piedmont, where very rare.
HabitatWet to periodically inundated soils of margins of blackwater streams and rivers, river marshes, beaver marshes, impoundment shores, swamp openings, wet savannas, clay-based bays.
PhenologyFlowering and fruiting late July-October.
IdentificationThis thoroughwort grows 2-4 feet tall and has an overall olive-green cast. Leaves most often are in whorls of 3, but may be opposite; they are broadly lance-shape and tapered to a short stalk. This is normally the only Eupatorium with leaves in whorls of 3, particularly those growing in Coastal Plain wetlands.
Taxonomic CommentsNone

Other Common Name(s)Small-flower Eupatorium
State RankS4
Global RankG5
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