Vascular Plants of North Carolina
Account for Manyflower Marsh-pennywort - Hydrocotyle umbellata   L.
Members of Hydrocotyle with account distribution info or public map:
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Section 6 » Order Apiales » Family Araliaceae
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AuthorL.
DistributionThroughout the Coastal Plain, and west into the eastern fringe of the Piedmont, sparingly to Orange and Mecklenburg counties.

This species has an odd range, being found mainly from MA southward in the Coastal Plain to FL and TX, but also found in the Great Lakes states, but no records yet for WV and KY.
AbundanceCommon to even locally very common over the Coastal Plain, but rare to locally uncommon in the eastern Piedmont. This is certainly the most numerous of the six native species in the state.
HabitatThis species has a very wide array of wetland habitats. It grows along lake and pond edges, marshes, ditches, openings in bottomlands, dune swales, and many other places with damp ground.
PhenologyBlooms from April to September, and fruits shortly after flowering.
IdentificationThis is a very familiar wetland species and is the default Hydrocotyle species, from which other species are to be compared. It usually has a single leaf and separate flowering stem, each up to about 8" tall. The rounded/orbicular leaf blade is peltate, with the petiole attaching to the middle of the underside; the margin is scalloped and the blade averages about 2-3" across. The single flower cluster (umbel) consists of 15-50 flowers, each quite small and greenish-white, and about 1" across. Other species have flower clusters along branches, on multiple branches, or in leaf axils; or -- if a simple umbel, they do not have rounded, peltate leaves. As with most others in the genus, it typically occurs in large to huge dense patches of uncountable plants.
Taxonomic CommentsNone

Other Common Name(s)Dollarweed
State RankS5
Global RankG5
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