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

Potamogeton oakesianus J.W. Robbins
Oakes' pondweed
Potamogetonaceae (Horned pondweed family)

Introduction to Vascular Plants

© Curtis Bjork  Email the photographer   (Photo ID #25340)

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Distribution of Potamogeton oakesianus
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Species Information

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General:
Perennial, aquatic herb from strong rhizomes; stems up to 100 cm long, branched.
Leaves:
Submersed leaves reduced to narrow, firm, cylindrical stalks without blades, growing from the branches of the main stem, 5-15 cm long, the stipules 2-4 cm long, delicate, shredded with age; floating leaves egg-shaped, 3-5 cm long, 1-3 cm wide, the larger ones with 9 to 19 veins, leathery, long-stalked, the tips rounded, rounded or tapering at the bases.
Flowers:
Inflorescence spikelike, the spikes 1.5-3 cm long, with 3 to 8 whorls of flowers, the stalks slightly inflated.
Fruits:
Achenes, widely egg-shaped, 2.5-3.5 mm long, 2-2.4 mm wide, the beaks cylindrical, the keels obscure, developed in the upper half of achenes.
Notes:
Stem anatomical characters Interlacunar bundles strongly developed in the outer interlacunar circle of aerenchyma with some bundles scattered in the neighbouring circles, subepidermal bundles absent, pseudohypodermis absent or 1 cell thick, endodermis of U-cells.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Lakes and ponds in the lowland and montane zones; rare in SW and SC BC, known only from Steelhead (near Vancouver) and Mara Lake; disjunct E to MB, E to NF and S to ME, MA, PA, SC, TN, WI, MN and MT.

Source: The Illustrated Flora of British Columbia

Climate

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