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Aquatic and Wetland Vascular Plants of the Northern Great Plains

55. Potamogetonaceae, the Pondweed Family

1. Potamogeton L. -- Pondweed

17. Potamogeton strictifolius Benn.

Stems mostly terete, 0.4-0.8 mm thick, simple or branched, to 1 m long. Leaves all submersed, linear, 1.2-6.3 cm long, 0.6-2 mm wide, 3- to 5(7)-nerved, acute to attenuate at the tip, the margin often revolute, tapered to the sessile base; stipules free, white, fibrous, shredding at the tip, 6-16 mm long; glands present at the base of the stipules. Winter buds common, terminal or lateral, 2.5-4.8 cm long; inner leaves undifferentiated from the outer ones; outer leaves 3-4 per side, acute, mostly without or rarely with corrugations at the base. Spikes cylindric, 6-13 mm long; floral whorls 3-4, 1.5-4.2 mm apart; peduncles cylindric, rarely slightly clavate, 1-4.5 cm long. Fruits greenish-brown, obovoid, 1.9-2.1 mm long, rounded on the back. Jul--Aug. Shallow water of ponds, lakes and slow streams; rare, reported from McHenry Co., ND, Cherry Co., NE and Albany Co., WY; (Newf. and Que. to Alta. and N.W.Terr., s to NY, OH, n IN, MN, n NE, WY and n UT).
GIF- Distribution Map

Map key

Previous Section -- Potamogeton richardsonii (Benn.) Rydb. -- Claspingleaf pondweed
Return to Family -- Potamogetonaceae - The Pondweed Family
Next Section -- Potamogeton vaginatus Turcz. -- Sheathed pondweed

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