Zannichellia palustris L.
horned pondweed
Potamogetonaceae (Horned pondweed family)
(Previously in Zannichelliaceae)
Introduction to Vascular Plants
horned pondweed
Potamogetonaceae (Horned pondweed family)
(Previously in Zannichelliaceae)
Introduction to Vascular Plants
Species Information
General:
Perennial, aquatic herb from slender rhizomes; stems threadlike, freely branching, 20-50 cm long.
Leaves:
Stem leaves opposite, threadlike, 1-nerved, 2-10 cm long, less than 1 mm wide, the tips abruptly pointed, membranous-sheathing at the base.
Flowers:
Inflorescence of male and female flowers in the axils, sometimes not together; the female flowers mostly of 3-5 carpels, unstalked or short stalked with a subtending bract shorter than the pistils; male flowers a single stamen.
Fruits:
Achenes, stalked, the backs curved, the fronts smooth or sharply toothed, beaked, the beaks 1 mm long.
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
Ecology
Ecological Framework for Zannichellia palustris
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) |
843 | 676 | 1010 |
| Slope
Gradient (%) |
1 | 0 | 3 |
|
Aspect (degrees) |
0 | ||
| Soil
Moisture Regime (SMR) [0 - very xeric; 4 - mesic; 8 - hydric] |
7 | 7 | 7 |
| 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 |
BG(1), IDF(1) | ||
|
Source:
Klinkenberg 2013
|
|||
Habitat and Range
Shallow, often alkaline or brackish lakeshores, slow-moving streams and tidal marshes in the lowland, steppe and montane zones; frequent in BC south of 54 degrees N, less frequent northward and on Vancouver Island; cosmopolitan, E to NF and NS and S to FL, TN, TX, MX; S America, Eurasia, Africa.Status Information
Synonyms
Synonyms and Alternate Names:
Zannichellia major (Hartm.) Boenn. ex Rchb.
Zannichellia palustris var. major (Hartman) W.D.J. Koch
Zannichellia palustris var. stenophylla Aschers. & Graebn.