Potamogeton zosteriformis Fernald
eel-grass pondweed (flatstem pondweed)
Potamogetonaceae (Horned pondweed family)
Introduction to Vascular Plants
eel-grass pondweed (flatstem pondweed)
Potamogetonaceae (Horned pondweed family)
Introduction to Vascular Plants
Photograph
Map
Distribution of Potamogeton zosteriformis
Click here to view the full interactive map and legend
Species Information
General:
Perennial, aquatic herb from fine, tufted roots; stems up to 130 cm long, strongly compressed, flattened, branched.
Leaves:
All submersed, linear, the sides parallel, stiff, olive green, 10-20 cm long, 0.2-0.5 cm wide, unstalked, usually with 7 to 15 veins, attached at the nodes, tapering to pointed tips, the stipules 1.5-3.5 cm long, the margins overlapping, straight, smooth.
Flowers:
Inflorescence spikelike, the spikes 1.5-3 cm long, with 5 to 9 whorls of flowers, the stalks thin.
Fruits:
Achenes, egg-shaped, 4-5 mm long, 3-3.5 mm wide, the beaks conspicuous, the keels winged.
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.
Illustration Source: The Illustrated Flora of British Columbia
USDA Species Characteristics
Flower Colour:
Green
Blooming Period:
Mid Summer
Fruit/Seed characteristics:
Colour: Green
Present from Summer to Fall
Source: The USDA
Ecology
Ecological Framework for Potamogeton zosteriformis
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)
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) |
1117 | 1117 | 1118 |
| Slope
Gradient (%) |
0 | 0 | 0 |
|
Aspect (degrees) |
0 | ||
| Soil
Moisture Regime (SMR) [0 - very xeric; 4 - mesic; 8 - hydric] |
8 | 8 | 8 |
| Modal
Nutrient Regime
Class |
B | ||
| #
of field plots species was recorded in: |
4 | ||
| Modal
BEC Zone Class |
SBPS | ||
|
All BEC Zones (# of stations/zone) species was recorded in |
CDF(1), SBPS(3) | ||
|
Source:
Klinkenberg 2013
|
|||
Habitat and Range
Lakes in the lowland, steppe and montane zones; frequent in BC east of the Coast-Cascade Mountains, infrequent in coastal BC; N to AK, YT and NT, E to NF and S to ME, MA, NY, VA, OH, IN, IL, IA, NE, WY, UT, ID and CA.Status Information
Synonyms
Synonyms and Alternate Names:
Potamogeton compressus auct. non L.
Potamogeton zosterifolius subsp. zosteriformis (Fernald) HultΘn