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

7. Fimbristylis Vahl

1. Fimbristylis autumnalis (L.) R. & S.

Tufted annual with shallow fibrous roots; culms 1-many, flattened, 0.5-4 dm tall. Leaves shorter than the culms; blades flat, 1-2 mm wide; ligule a line of short hairs. Inflorescence cymose, subtended by 2 or 3 foliaceous bracts, these usually shorter than the inflorescence; pedicels filiform, stiffly spreading to ascending; spikelets usually many, solitary or partly in twos or threes on the pedicels, lanceolate to oblong-lanceolate, 3-10 mm long; scales golden-brown or coppery with a prominent green midrib, elliptic-ovate, 1-1.5 mm long, awn-tipped below to mucronate above in the spikelet; stamens 2; styles trifid. Achenes ivory to light brown, trigonous, 0.4-0.5 mm long, strongly ribbed on the 3 angles, nearly smooth to cross-reticulate on the faces, sometimes warty toward the base. Jun--Sep. Shores, stream banks and wet meadows, often where sandy; rare and probably occurring as a waif in our range, e SD and e NE; (ME and Que. to MN and SD, s to FL and TX; also Mex., C. and S.Amer.).
GIF- Distribution Map

Map key

Previous Section -- Eriophorum viridicarinatum (Engelm.) Fern.
Return to Family -- Cyperaceae - The Sedge Family
Next Section -- Fimbristylis puberula (Michx.) Vahl

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 06:43:07 EST
Sioux Falls, SD [sdww55]