Vascular Plants of North Carolina
Account for Rough Boneset - Eupatorium pilosum   Walter
Members of Asteraceae:
Members of Eupatorium with account distribution info or public map:
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Section 6 » Order Asterales » Family Asteraceae
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DistributionCoastal Plain, Sandhills, and lower Piedmont; upper Piedmont and low Mountains. The gap in the central Piedmont is clearly real.

MA and NY to KY, south to FL and southeastern LA.
AbundanceCommon to locally abundant in the Coastal Plain; fairly common to common in the lower Piedmont. Infrequent to locally fairly common in the Piedmont foothills and lower Mountains, but very rare in the middle and higher elevations and (oddly) the central Piedmont. The NCNHP's rank of S4 is conservative; it actually is S5 rank in the state.
HabitatWet to moist Longleaf Pine-Wiregrass savannas and flatwoods, pocosin ecotones, blackwater streamheads and ecotones, damp meadows, wet powerlines, montane seepage bogs, interdune marshes.
PhenologyFlowering and fruiting August-October.
IdentificationRough Boneset is a wetland species that usually grows 2-3 feet tall and resembles Roundleaf Thoroughwort (E. rotundifolium), but is distinct in several characters. The middle and upper leaves are noticeably reduced in size (vs. about the same size throughout); leaves are ovate to triangular and bluntly pointed in outline (vs. rotund and without a point); and leaves have very short but distinct leafstalks (vs. none). Also, the leaves on some plants are strongly ascending as opposed to horizontally arranged. In combination, these characters give it a very different gestalt in the field than any of our eupatoriums, making it easy to identify.
Taxonomic CommentsIn some older texts, treated as a variety of Roundleaf Thoroughwort, clearly a mistake.

Other Common Name(s)Rough Eupatorium, Rough Thoroughwort
State RankS4 [S5]
Global RankG5
State Status
US Status
USACE-agcpFACW link
USACE-empFACW link
County Map - click on a county to view source of record.
Photo Gallery
B.A. SorrieEcotone of streamhead leading to Little River, 1 Sept 2009. MoorePhoto_natural
B.A. SorrieEdge of beaver pond near Slate Road, in bud, 12 July 2009.
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