Vascular Plants of North Carolina
Account for Annual Marsh-elder - Iva annua   L.
Members of Asteraceae:
Members of Iva with account distribution info or public map:
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Section 6 » Order Asterales » Family Asteraceae
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DistributionKnown from the southeastern Piedmont and the western and outer Coastal Plain, with a large gap in between -- real or collecting artifact? First collected in 1956 in Anson and Franklin counties.

Native of the U.S. west of the Appalachians. East of there, scattered from ME to FL.
AbundanceUncommon to locally numerous in the Piedmont; rare in the Coastal Plain. Can occur in large stands (as in Wake County near the Neuse River).
HabitatDry to moist roadsides, powerlines, woodland trailside, fields, cropfields, near creeks, freshwater marsh.
PhenologyFlowering and fruiting September-November.
IdentificationThis species of Iva grows 2-4 feet (or more) tall. The leaves are opposite, ovate, and sharply toothed. Like others in the genus, its heads grow in dense, linear spike-like inflorescences, strongly vertically aligned. It differs in the combination of opposite, toothed leaves that are not dissected.
Taxonomic Comments
Other Common Name(s)
State RankSE
Global RankG5
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US Status
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