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

63. Poaceae, the Grass Family

13. Glyceria R. Br. -- Mannagrass

1. Glyceria borealis (Nash) Batch. -- Northern mannagrass

Culms 5-13 dm tall, rather weak, sometimes decumbent at the base, often producing adventitious roots from submersed lower nodes. Leaf blades 2-6 mm wide, glabrous; sheaths glabrous, the ligule scarious, rounded, 3-10 mm long. Panicle 15-40 cm long, with stiff, erect to ascending, racemelike branches. Spikelets linear, mostly 6- to 13-flowered, 9-15 mm long; glumes obtuse, the first 1.5-2 mm long, the second 2.5-3.5 mm long; lemmas oblanceolate, 3-4 mm long, obtuse to subacute, scarious-margined, scaberulous on the nerves; anthers 3, 0.5-0.9 mm long. Grain dark brown, oblong to ovoid, apiculate at the base, furrowed on the upper face, 1.5 mm long. Jun--Aug. In shallow water or mud of streams, ditches, ponds and marshes; frequent in ND and ne SD, otherwise rare in w SD and n NE; (Newf. to AK, s to NJ, PA, IL, MN, SD, NM, AZ and CA).

Glyceria fluitans (L.) R. Br. is a similar species found only in the Black Hills; otherwise it occurs well east of the region. It differs from G. borealis in the longer, more scabrous lemmas 4-7 mm long. This species is known from Custer and Pennington Counties, SD.

GIF- Distribution Map

Map key

Previous Section -- Eragrostis reptans (Michx.) Nees
Return to Family -- Poaceae - The Grass Family
Next Section -- Glyceria grandis S. Wats. -- American mannagrass

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 06:43:12 EST
Sioux Falls, SD [sdww55]