Potamogeton nodosus Poir.
long-leaved pondweed (longleaf pondweed)
Potamogetonaceae (Horned pondweed family)
Introduction to Vascular Plants
long-leaved pondweed (longleaf pondweed)
Potamogetonaceae (Horned pondweed family)
Introduction to Vascular Plants
Photograph
Species Information
General:
Perennial, aquatic herb from strong rhizomes; stems up to 150 cm long, simple or branched.
Leaves:
Submersed leaves narrowly lanceolate, flat, leathery, dark green, 4-15 cm long, 1-4 cm wide, with 7 to 15 veins, the tips blunt, tapering into long stalks greater than 2 cm long, the stipules 3-6 cm long, delicate and early decaying; floating leaves lanceolate to elliptical, 5-20 cm long, 2-7 cm wide, leathery, long-stalked, the tips pointed, tapering at the bases.
Flowers:
Inflorescence spikelike, the spikes 3-6 cm long, with 10 to 16 whorls of flowers, the stalks thick, inflated.
Fruits:
Achenes, widely egg-shaped or almost globe-shaped, 3.5-4 mm long, 2.5-3 mm wide, the beaks short, the keels strongly developed.
Notes:
Stem anatomical characters Interlacunar and subepidermal bundles absent, pseudohypodermis absent, endodermis of O-cells with variably thickened cell walls and approaching 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:
Mid Summer
Fruit/Seed characteristics:
Colour: Brown
Present over the Summer
Source: The USDA
Ecology
Ecological Framework for Potamogeton nodosus
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) |
717 | 390 | 1045 |
| Slope
Gradient (%) |
0 | 0 | 0 |
|
Aspect (degrees) |
0 | ||
| Soil
Moisture Regime (SMR) [0 - very xeric; 4 - mesic; 8 - hydric] |
7 | 7 | 8 |
| Modal
Nutrient Regime
Class |
D | ||
| #
of field plots species was recorded in: |
2 | ||
| Modal
BEC Zone Class |
IDF | ||
|
All BEC Zones (# of stations/zone) species was recorded in |
CWH(1), IDF(1) | ||
|
Source:
Klinkenberg 2013
|
|||
Habitat and Range
Lakes and sloughs of the lowland zone; rare in the lower Fraser River Valley and in the Okanagan Valley, doubtful elsewhere; cosmopolitan with disjunctions, E to PQ and NB and S to ME, MA, PA, NC, FL, MS, TX, NM, AZ and CA; Eurasia, Mexico, S America, Africa.Status Information
Synonyms
Synonyms and Alternate Names:
Potamogeton americanus Cham. & Schltdl.
Potamogeton fluitans Roth