Potamogeton praelongus Wulfen
long-stalked pondweed (whitestem pondweed)
Potamogetonaceae (Horned pondweed family)
Introduction to Vascular Plants
long-stalked pondweed (whitestem pondweed)
Potamogetonaceae (Horned pondweed family)
Introduction to Vascular Plants
Species Information
General:
Perennial, aquatic herb from strong rhizomes; stems mostly unbranched, often flexuous, nearly circular in cross-section, tapered, up to 200 cm long.
Leaves:
All submersed, linear-lanceolate, thin, flat, light green fading to white, 10-20 cm long, 2-4 cm wide, with 11 to 33 veins, clasping the stem, the tips rounded or hood-shaped, the stipules 3-10 cm long, fibrous or stringy; floating leaves absent.
Flowers:
Inflorescence spikelike, the spikes 3-5 cm long, with 6 to 12 whorls of flowers, the stalks inflated.
Fruits:
Achenes, widely egg-shaped or almost globe-shaped, 4.3-5.7 mm long, 3.2-4 mm wide, the beaks prominent, widely triangular, the keels wide.
Notes:
Stem anatomical characters interlacunar bundles throughout the stem aerenchyma, subepidermal bundles absent, pseudohypodermis 1 to 3 cells thick, endodermis of U-cells.
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:
Late Spring
Fruit/Seed characteristics:
Colour: Green
Present over the Summer
Source: The USDA
Ecology
Ecological Framework for Potamogeton praelongus
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) |
|||
| Slope
Gradient (%) |
|||
|
Aspect (degrees) |
0 | ||
| Soil
Moisture Regime (SMR) [0 - very xeric; 4 - mesic; 8 - hydric] |
|||
| Modal
Nutrient Regime
Class |
|||
| #
of field plots species was recorded in: |
1 | ||
| Modal
BEC Zone Class |
CWH | ||
|
All BEC Zones (# of stations/zone) species was recorded in |
CWH(1) | ||
|
Source:
Klinkenberg 2013
|
|||
Habitat and Range
Lakes in the lowland, steppe and montane zones; frequent throughout BC; circumpolar, N to AK, YT and NT, E to NF and S to ME, MA, NY, OH, IN, IL, IA, NE, CO, UT, ID and CA; Eurasia.Status Information
Synonyms
Synonyms and Alternate Names:
Potamogeton praelongus var. angustifolius Graebn.