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

Potamogeton robbinsii Oakes
Robbin's pondweed
Potamogetonaceae (Horned pondweed family)

Introduction to Vascular Plants

© Jamie Fenneman  Email the photographer   (Photo ID #14606)

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

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Perennial, aquatic herb from strong rhizomes; stems creeping, up to 100 cm long, branched.
All submersed, 2-ranked, linear-lanceolate, the sides parallel, dark green, stiff, unstalked, with 9 to 35 veins, 2-10 cm long, 0.4-0.8 cm wide, attached at about 5-10 mm above the nodes, the tips pointed, the bases rounded, the margins toothed, the stipules 0.5-2 cm long, light green or whitish, the tips shredded.
Inflorescence spikelike, often branched, the spikes 2.5-4 cm long, with 3 to 5 whorls of flowers, the stalks thin.
Achenes, rarely developed.

Source: The Illustrated Flora of British Columbia

USDA Species Characteristics

Flower Colour:
Blooming Period:
Late Summer
Fruit/Seed characteristics:
Colour: Green
Present from Summer to Fall
Source:  The USDA

Habitat / Range

Lakes in the lowland, steppe and montane zones; frequent in coastal BC, infrequent E of the Coast-Cascade Mountains; N to AK, YT and NT, E to PQ, NB and NS and S to to ME, MA, PA, OH, AL, IL, MN, CO, UT, ID and OR.

Source: The Illustrated Flora of British Columbia


Ecological Framework for Potamogeton robbinsii

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)
Slope Gradient (%)
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
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: CDF(3), CWH(9)


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

Additional Photo Sources

General References