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Muddy borders of fluctuating streams and ponds. Occasional on mudflats.
Acalypha rhomboidea, Acnida altissima, Alisma subcordatum, Asclepias incarnata, Eragrostis hypnoides, Leersia oryzoides, Ludwigia polycarpa, Lycopus americanus, Mimulus ringens, Penthorum sedoides, Verbena hastata.
Ontario to MN and SD, south to FL and Mexico.
Creeping, herbaceous perennial to 60 cm. Leaves laceolate to lance-ovate, more than 1 cm wide, acute or acuminate, evenly toothed from below the middle, with at least 10 sharp teeth. Flowers in dense, terminal, solitary, rounded to cylindrical heads or short spikes, on long peduncles from the leaf axils; calyx lobes 2 to 4; corollas 2-lipped; stigmas densely clustered. Fruit a nutlet.
Flowers early June to late September
Wetland indicator: Obligate
Also called Lippia lanceolata Michx. This specimen was found bordering a backwater pool of a large river.
Gleason, Henry A. and A. Cronquist. 1991. Manual of Vascular Plants of Northeastern United States and Adjacent Canada. Second Ed.
The New York Botanical Garden. Bronx, NY
Swink, F. and G. Wilhelm. 1994. Plants of the Chicago Region.
Indiana Academy of Science. The Morton Arboretum. Lisle, Illinois.
Michael Hough © 2005