Vascular Plants of North Carolina
Account for Coastal Plain Joe-pye-weed - Eutrochium dubium   (Willdenow ex Poiret) E.E. Lamont
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Section 6 » Order Asterales » Family Asteraceae
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Author(Willdenow ex Poiret) E.E. Lamont
DistributionCoastal Plain, Sandhills, and lower Piedmont; apparently sparse in the northern portion of the Piedmont. Records from mountain counties are misidentified.

Coastal Plain and adjacent Piedmont, N.S. to southern SC.
AbundanceGenerally common in the Sandhills and southern Coastal Plain. Fairly common in the central Coastal Plain, but uncommon in the northern portions and in the eastern Piedmont.
HabitatWet freshwater marshes, fresh-tidal marshes, maple-gum-cypress swamps, blackwater river floodplains and backup channels, beaver ponds and marshes.
PhenologyFlowering and fruiting late July-October.
IdentificationCoastal Plain Joe-Pye-Weed usually grows 1.5-3 feet tall, occasionally to 4 feet. Leaves are in whorls of 3-4, ovate and sharply toothed. Leaves show 3 main veins that all begin at the summit of the leafstalk, unlike our other species. The heads have only 6-9 florets (vs. 4-7 in our other species except E. maculatum, which has 9-22). Heads all lack ray florets and are pinkish-red-purple. Leaves are thick-textured (and quite rugose/wrinkled), except for those in the shade, which are markedly thinner-textured.
Taxonomic CommentsFormerly treated as Eupatorium dubium.

Other Common Name(s)Three-nerved Joe-pye-weed, Coastal Joe-pye-weed
State RankS4S5 [S5]
Global RankG5
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