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

Potamogeton foliosus Raf.
closed-leaved pondweed (leafy pondweed)
Potamogetonaceae (Horned pondweed family)

Introduction to Vascular Plants
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Distribution of Potamogeton foliosus
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Species Information

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Perennial, aquatic herb from fine, tufted roots; stems up to 100 cm long, extensively branched.
All submersed, linear, the sides parallel, thin, green, 1-9 cm long, 0.3-2.5 mm wide, usually with 3 veins, unstalked, the tips pointed, the stipules 0.5-1 cm long, delicate, not fibrous, greenish or brownish, the margins fused towards the bases, the veins evident as ridges running the entire length, the glands either lacking or poorly developed.
Inflorescence spikelike, the spikes 0.5-1.5 cm long, with 2 to 5 whorls of flowers, the stalks thin; bases of winter buds soft, smooth.
Achenes, egg-shaped, 1.5-2.5 mm long, 1.2-2 mm wide, widest in the middle, the beaks short stubby, the keels strongly developed, winged.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Lakes, ponds and ditches in the lowland, steppe and montane zones; frequent in BC south of 55 degrees N, rare in N BC, N to AK and YT, E to NF and S to ME, MA, PA, NC, FL, MS, LA, TX, NM, AZ and CA; Mexico.

Source: The Illustrated Flora of British Columbia


Ecological Framework for Potamogeton foliosus

The table below shows the species-specific information calculated from
original data (BEC database) provided by the BC Ministry of Forests and Range.
(Updated August, 2013)

Site Information
Value / Class




Elevation (metres) 60 611 1147
Slope Gradient (%) 0 0 0
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
5 7 8
Modal Nutrient Regime
Number of field plots
 species was recorded in:
Modal BEC Zone Class
All BEC Zones (# of stations/zone) species was recorded in: CWH(2), IDF(1), SBS(12)


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.

Synonyms and Alternate Names

Potamogeton foliosus var. foliosus Raf. [superfluous autonym]

Taxonomic and Nomenclatural Links

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General References