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

Potamogeton obtusifolius Mert. & W.D.J. Koch
blunt-leaved pondweed (bluntleaf pondweed)
Potamogetonaceae (Horned pondweed family)

Introduction to Vascular Plants

© Jamie Fenneman  Email the photographer   (Photo ID #17174)

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Distribution of Potamogeton obtusifolius
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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, soft, light to olive-green, 3-8 cm long, 2-4 mm wide, usually with 3 to 5 veins, the tips rounded, the stipules 0.5-2 cm long, delicate, not fibrous, greenish or brownish, not shredding at the tips, the margins overlapping.
Inflorescence spikelike, the spikes 0.5-1.5 cm long, with 3 to 8 whorls of flowers, the stalks thin; bases of winter buds soft, smooth.
Achenes, egg-shaped, 3-4 mm long, 1.5-2.5 mm wide, widest above the middle, the beaks short, the keels absent.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Lakes and sloughs in the lowland, steppe and montane zones; infrequent throughout BC; circumpolar, N to YT, E to ON, NS and NF and S to ME, MA, PA, NC, FL, AL, MI, and LA; Eurasia, Australia.

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