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

Potamogeton richardsonii (Benn.) Rydb.
Richardson's pondweed
Potamogetonaceae (Horned pondweed family)

Introduction to Vascular Plants

© Jamie Fenneman  Email the photographer   (Photo ID #14162)

E-Flora BC Static Map
Distribution of Potamogeton richardsonii
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Species Information

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Perennial aquatic herb from strong rhizomes; stems up to 150 cm long, branched.
All submersed, triangular-lanceolate, thin, flat, dark green, 3-10 cm long, 1-3 cm wide, the tips blunt, clasping the stem, the stipules 1-3 cm long, coarse, disintegrating into persistent whitish fibres that remain even on old plants, fibrous or stringy; floating leaves absent.
Inflorescence spikelike, the spikes 1-4 cm long, with 6 to 12 whorls of flowers, the stalks inflated, club-shaped, 1.5-25 cm long.
Achenes, widely egg-shaped or almost rounded, 2.5-3 mm long, 2.3-2.7 mm wide, the beaks prominent, triangular, the keels absent.
Stem anatomical characters interlacunar bundles and subepidermal bundles absent, pseudohypodermis 1 cell thick, endodermis of O-cells.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Lakes, ponds and sloughs in the lowland, steppe and montane zones; common throughout BC; amphiberingian, N to AK, YT and NT, E to PQ, NB and NS and S to to ME, MA, PA, OH, IN, IL, IA, NE, CO, AZ and CA; E Asia.

Source: The Illustrated Flora of British Columbia


Ecological Framework for Potamogeton richardsonii

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) 667 782 1117
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]
7 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: SBPS(5), SBS(16)


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 perfoliatus subsp. richardsonii (Benn.) HultTn
Potamogeton perfoliatus var. richardsonii Benn.

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References