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

Introduction to Vascular Plants

Photograph

© Jamie Fenneman     (Photo ID #14606)

Map

E-Flora BC Static Map

Distribution of Potamogeton robbinsii
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Species Information

General:
Perennial, aquatic herb from strong rhizomes; stems creeping, up to 100 cm long, branched.
Leaves:
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.
Flowers:
Inflorescence spikelike, often branched, the spikes 2.5-4 cm long, with 3 to 5 whorls of flowers, the stalks thin.
Fruits:
Achenes, rarely developed.

Source:  The Illustrated Flora of British Columbia

Illustration

If more than one illustration is available for a species (e.g., separate illustrations were provided for two subspecies) then links to the separate images will be provided below. Note that individual subspecies or varietal illustrations are not always available.

USDA Species Characteristics

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

Ecology

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

Avg

Min

Max
Elevation (metres)
Slope Gradient (%)

Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]

 0
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
Modal Nutrient Regime
Class
# of field plots
 species was recorded in:
 12
Modal BEC Zone Class
 CWH

All BEC Zones (# of stations/zone) species was recorded in

 CDF(3), CWH(9)

Habitat and 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

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