USGS - science for a changing world

Northern Prairie Wildlife Research Center

  Home About NPWRC Our Science Staff Employment Contacts Common Questions About the Site

Aquatic and Wetland Vascular Plants of the Northern Great Plains

62. Cyperaceae, the Sedge Family

11. Scirpus L. -- Bulrush

4. Scirpus heterochaetus Chase -- Slender bulrush


Much like S. acutus in habit and general appearance; culms more slender, 1-2(2.3) m long. Leaves reduced mainly to 3-4 sheaths at the base of the culm, the upper sheaths with a blade to 6.5 cm long; principal involucral bract erect, 1-15 cm long. Inflorescence a rather open, lax panicle of up to 60 spikelets, usually much fewer; spikelets solitary (rarely paired) on the pedicels, 5-17 mm long, 3-6 mm thick; scales suffused with light brown to reddish-brown, 2.5-3.5 mm long, scarious, mucronate to aristate, with an awn to 2 mm long; perianth of 2-4 bristles, the 2 bristles on the angles of the achene usually the longest, sometimes exceeding the achene body; stamens 3; styles trifid. Achenes light green to dark grayish-brown, unequally trigonous, the ventral face broad and flat, achene body 2-2.5 mm long, 1.5-2 mm wide, with a beak 0.2-0.8 mm long. Jun--mid Aug. In the same habitats as S. acutus, but only dominant where the water is fresh; occasional in the e and c parts, rare w and s; (Que. and MA to ND, s to VA, MO, n TX and intermittently w to WA and CA).
GIF- Distribution Map

Map key


Previous Section -- Scirpus fluviatilis (Torr.) A. Gray -- River bulrush
Return to Family -- Cyperaceae - The Sedge Family
Next Section -- Scirpus maritimus L. -- Prairie bulrush

Accessibility FOIA Privacy Policies and Notices

Take Pride in America logo USA.gov logo U.S. Department of the Interior | U.S. Geological Survey
URL: http://www.npwrc.usgs.gov/resource/plants/vascplnt/species/shet.htm
Page Contact Information: Webmaster
Page Last Modified: Saturday, 02-Feb-2013 06:47:13 EST
Reston, VA [vaww54]