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

2. Carex L. -- Sedge

43. Carex retrorsa Schwein.

Densely tufted from short rootstocks; culms obtusely trigonous, 2-10 dm long. Leaves soft, 4-10 mm wide; sheaths green or yellow-tinged and conspicuously septate-nodulose dorsally, yellowish-brown and hyaline ventrally. Spikes unisexual, the upper 1-4 staminate, the terminal one largest, 1.5-5 cm long, just above or protruding from the cluster of pistillate spikes; lower spikes pistillate, sessile and aggregate or the lower 1 or 2 separate and peduncled, cylindric, 1.5-6 cm long, 12-20 mm thick; bracts leaflike, several to many times longer than the inflorescence; pistillate scales obtuse to acuminate, much shorter than the perigynia. Perigynia widely spreading to reflexed, yellow-green to green, shiny, subterete, ovoid, inflated, 5-10 mm long, 1/3 to 1/2 as wide, coarsely 7- to 9-nerved, tapering or contracted to a smooth or serrulate beak 2-3.5 mm long, the teeth 0.5-1 mm long, straight; achenes trigonous, 2-3 mm long; stigmas 3, the style strongly S-curved toward the base. Jun--Aug. Swamps, bogs, springs, wet meadows, shores, stream banks and wet woods; frequent from e and c ND to e SD, also the Black Hills; (Que. and N.S. to B.C., s to NJ, IN, IA, SD and OR).
GIF- Distribution Map

Map key

Previous Section -- Carex pseudo-cyperus L.
Return to Family -- Cyperaceae - The Sedge Family
Next Section -- Carex rostrata Stokes ex With. -- Beaked sedge

Accessibility FOIA Privacy Policies and Notices

Take Pride in America logo logo U.S. Department of the Interior | U.S. Geological Survey
Page Contact Information: Webmaster
Page Last Modified: Saturday, 02-Feb-2013 06:41:48 EST
Sioux Falls, SD [sdww54]