E-Flora BC: Electronic Atlas of the Flora of British Columbia

Potamogeton friesii Rupr.
flat-stalked pondweed (Fries' pondweed)
Potamogetonaceae (Horned pondweed family)

Introduction to Vascular Plants
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E-Flora BC Static Map
Distribution of Potamogeton friesii
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Species Information

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Perennial, aquatic herb from fine, tufted roots; stems up to 100 cm long, sparsely branched.
All submersed, linear, the sides parallel, rigid, light to olive-green, 2.5-7 cm long, 1.2-3.5 mm wide, usually with 5 to 7 veins and narrow translucent bands (1 or 2 cells wide) along the midveins, blunt or rounded and slightly abruptly slender-tipped, the tips pointed, the stipules 0.5-2 cm long, coarsely fibrous, whitish, the tips shredding, the margins overlapping, basal glands present.
Inflorescence spikelike, the spikes 0.5-1.5 cm long, with 2 to 5 whorls of flowers, the stalks thin; winter buds fan-shaped, the bases hard, strongly ribbed.
Achenes, egg-shaped, 1.5-2.5 mm long, 1.2-2 mm wide, widest above the middle, the beaks short, the keels low and rounded.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Lakes, ponds and ditches in the lowland, steppe and montane zones; frequent in BC east of the Coast-Cascade Mountains, infrequent in coastal BC; circumpolar, N to AK, YT and NT, E to NF and S to ME, MA, PA, OH, IN, IL, IA, NE, WY, UT, ID, and WA; Eurasia.

Source: The Illustrated Flora of British Columbia


The climate type for this species, as reported in the: "British Columbia plant species codes and selected attributes. Version 6 Database" (Meidinger et al. 2008), is not evaluated, unknown or variable.

Taxonomic and Nomenclatural Links

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General References