Vascular Plants of North Carolina
Section: Common Name: Scientific Name: Family:
Account for Mohr's Thoroughwort - Eupatorium mohrii   Greene
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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AuthorGreene
DistributionSandhills and Coastal Plain, including the Outer Banks; sparse in the northeastern corner of the state. Rare in Piedmont, at Lomax Longleaf South streamheads in Uwharrie NF, Montgomery County.

Coastal Plain, southeastern VA to southern FL and TX.
AbundanceUncommon to locally common. Probably rare in the far northeastern counties, and also rare in the northwestern Coastal Plain.
HabitatMoist Longleaf Pine-Wiregrass savannas and flatwoods, pocosin ecotones, streamhead ecotones, seasonally wet or ponded depressions and sinkhole ponds, interdune ponds and marshy swales.
PhenologyFlowering and fruiting August-October.
IdentificationMohr's Thoroughwort has opposite, sessile (no leafstalk) leaves which are toothed along the margin, at least on the basal half. Leaves are widest beyond the middle and are 5-10 (or more) mm wide. Most importantly, the leaves are not straight but are curved downward. It recall plants of E. leucolepis, but with much wider leaves. They recall plants of E. glaucescens, but that plant's leaves are straight and not curved downward. It is close to E. recurvans, but that plant often branches from the base (vs. not) and flower bracts are 3-4 mm long (vs. 5-7 mm long). Obviously, Coastal Plain wetland species of Eupatorium with rather narrow leaves can be difficult to identify; be thorough before making an identification.
Taxonomic CommentsFormerly treated as part of E. recurvans.

Other Common Name(s)Mohr's Eupatorium
State RankS3 [S4]
Global RankG4?
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B.A. SorrieSame data; midstem leaves. ScotlandPhoto_natural
B.A. SorrieSandhills Game Land, 17 Frog Pond, mid-upper bottom, 10 Sept 2021. ScotlandPhoto_natural
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