Northern Prairie Wildlife Research Center


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Wyoming Rare Plant Field Guide

Cottongrass Bulrush
Scirpus cyperinus

JPG -- Species Photo

GIF -- Distribution Map

Synonym: Scirpus atrocinctus
Similar Species: S. microcarpus and S. pallidus have sessile spikelets in head-like clusters and bristles shorter or equal to the achenes.
Flowering/Fruiting Period: July-August.
Distribution: Newfoundland to British Columbia, south to Florida and Texas; disjunct in the Black Hills of South Dakota and Wyoming (Crook Co.).
Habitat: Moist to saturated soils of forested wetlands and streambanks. Elev. 4400-5600 ft.
References: Fertig 1993 b; Gleason and Cronquist 1991; Hitchcock et al. 1969; Marriott 1993 b; Ode and Marriott 1990.

U.S. Department of the Interior | U.S. Geological Survey
URL: http://www.npwrc.usgs.gov/resource/plants/wyplant/spec/scircype.htm
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Page Last Modified: Saturday, 02-Feb-2013 06:55:11 EST
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