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Marshes, standing water, freshwater shores. Tolerant of alkalinity.
In marshes with Alisma subcordatum, Calamagrostis canadensis, Impatiens capensis, Iris virginica shrevei, Leersia oryzoides, Penthorum sedoides, Polygonum coccineum, Rumex verticillatus, Sagittaria latifolia, Scirpus validus creber, Sium suave, Sparganium eurycarpum, Typha latifolia.
Widespread in southern Canada and the northern U.S., occurring as far south as VA, MO, KS, and CA.
Herbaceous perennial from robust, tuber-bearing rhizomes. Leaves linear, more than 1 cm wide. Culms stout, 1 cm or more wide, sharply triangular. Bracts subtending inflorescence spreading, leafy, 2 or more. Stigmas 3. Achenes less than 3.5 mm long.
Flowers late May to early July
Wetland indicator: Obligate
Can occasionally dominate areas of marsh to the exclusion of other vegetation.
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