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

55. Potamogetonaceae, the Pondweed Family

1. Potamogeton L. -- Pondweed

8. Potamogeton friesii Rupr.

Stems compressed, mostly 0.5-1 mm wide, simple or branched, to 1-1.5 m long. Leaves all submersed, linear, 2.3-6.5 cm long, 1.2-3.2 mm wide, 5- to 7(9)-nerved, rounded to apiculate at the tip, the margin flat to eventually revolute, tapered to the sessile base; stipules free, white and fibrous, often shredding above, 5-20 mm long; glands present at the base of the stipules. Winter buds common, terminal or lateral, 1.5-5 cm long; inner leaves reduced, arranged into a fan-shaped structure; outer leaves 2-3 per side, apiculate to acute, indurate and corrugated at the base. Spikes cylindric, 7-16 mm long; floral whorls 2-5, 1.5-5 mm apart; peduncles slightly clavate, mostly 1.5-4(7) cm long. Fruits olive-green to brown, ovoid to obovoid, 1.8-2.5 mm long, rounded on the back. Jun--Aug. Shallow, fresh to brackish water of lakes and ponds; occasional from ND and e MT, s to n NE; (Newf. to AK, s to PA, n IN, IA, NE and UT).
GIF- Distribution Map

Previous Section -- Potamogeton foliosus Raf. -- Leafy pondweed
Return to Family -- Potamogetonaceae - The Pondweed Family
Next Section -- Potamogeton gramineus L. -- Variable pondweed

Accessibility FOIA Privacy Policies and Notices

U.S. Department of the Interior | U.S. Geological Survey
URL: http://www.npwrc.usgs.gov/resource/plants/vascplnt/species/pfrie.htm
Page Contact Information: Webmaster
Page Last Modified: Thursday, 03-Aug-2006 11:46:35 EDT
Menlo Park, CA [caww55]