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

Potamogeton natans L.
floating-leaved pondweed (floating pondweed)
Potamogetonaceae (Horned pondweed family)

Introduction to Vascular Plants

© Jamie Fenneman  Email the photographer   (Photo ID #4260)

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Distribution of Potamogeton natans
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Species Information

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General:
Perennial, aquatic herb from strong rhizomes; stems up to 200 cm long, unbranched.
Leaves:
Submersed leaves reduced to narrow, firm, dark green cylindrical stalks without blades, growing from the main stem, 10-20 cm long, the stipules 4-9 cm long, fibrous; floating leaves egg-shaped, 3-10 cm long, 2.5-6 cm wide, the larger ones with (18) 20 to 35 veins, leathery, long-stalked, the tips rounded, notched at the bases.
Flowers:
Inflorescence spikelike, the spikes with 6 to10 whorls of flowers, the stalks thick.
Fruits:
Achenes, broadly egg-shaped, 3.5-5 mm long, 2.5-3.5 mm wide, the beaks cylindrical, the keels obscure, developed in the upper half of achenes.
Notes:
Stem anatomical characters Interlacunar bundles present throughout the stem aerenchyma in several circles, subepidermal bundles present, pseudohypodermis 1-cell thick, endodermis of U-cells.

Source: The Illustrated Flora of British Columbia

USDA Species Characteristics

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

Habitat / Range

Lakes and ponds from the lowland and steppe to subalpine zones; common throughout BC; circumpolar, N to AK, YT and NT, E to NF and S to ME, MA, PA, NC, OH, IN, IL, IA, OK, NM, UT, AZ and CA; Eurasia.

Source: The Illustrated Flora of British Columbia

Ecology

Ecological Framework for Potamogeton natans

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

Minimum

Average

Maximum

Elevation (metres) 15 754 1232
Slope Gradient (%) 0 0 30
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
130 130 130
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
2 7 8
Modal Nutrient Regime
Class
C
Number of field plots
 species was recorded in:
44
Modal BEC Zone Class
SBS
All BEC Zones (# of stations/zone) species was recorded in: CDF(2), CWH(9), ICH(6), IDF(4), MS(1), PP(1), SBPS(6), SBS(15)

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

Additional Photo Sources

General References