Vascular Plants of North Carolina
Section: Common Name: Scientific Name: Family:
Account for Roundleaf Thoroughwort - Eupatorium rotundifolium   L.
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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AuthorL.
DistributionCoastal Plain, Sandhills, and lower Piedmont. Records from the central and upper Piedmont and the low Mountains could do with an ID check vs. E. pubescens, which has been split out from E. rotundifolium.

NY to IN and OK, south to southern FL and TX.
AbundanceCommon to locally abundant throughout the Coastal Plain, Sandhills, and eastern Piedmont. Its status in the central and western Piedmont and Mountains needs to be verified.
HabitatMoist to mesic or dry Longleaf Pine-Wiregrass uplands, savannas, flatwoods, pea swales; blackwater streamhead ecotones, pocosin/savanna ecotones; montane seepage bogs, slope seepages, meadows. In the Piedmont in fields, powerline clearings, wooded borders, and other rather weedy places.
PhenologyFlowering and fruiting August-October.
IdentificationRoundleaf Thoroughwort is readily identified by its sessile (stalkless), paired leaves and rotund leaf shape. The branched inflorescence and white heads are much like other thoroughworts. Hairy Thoroughwort (E. pubescens) is very closely related, but it grows taller (up to a foot more), and the leaves have an olive-green tone, rather than gray-green or plain green. In addition, leaf margins are generally sharply toothed vs. crenate (low, rounded teeth) in Roundleaf Thoroughwort and the rather ovate leaf shape rather than rotund. Note the absence of Hairy Thoroughwort in nearly all of the Coastal Plain. Rough Boneset (E. pilosum) often grows with Roundleaf Thoroughwort in moist soils; its leaves have short but distinct stalks, are ovate to triangular shaped and short-tapered to a blunt point.
Taxonomic CommentsSee Hairy Thoroughwort; it is treated by some as a variety of Roundleaf Thoroughwort.

Other Common Name(s)Roundleaf Boneset, Roundleaf Eupatorium
State RankS5
Global RankG5
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B.A. SorrieMoist roadside powerline, Aug 2011. MoorePhoto_natural
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