Northern Prairie Wildlife Research Center
Western Wetland Flora
Field Office Guide to Plant Species
Potamogeton natans L.
- Family: Pondweed (Potamogetonaceae)
- Flowering: June-August
- Field Marks: This species has ovate to elliptic floating leaves and long, linear, submersed leaves. The achenes are 1/6-1/4 inch long.
- Habitat: In shallow ponds, around the edge of lakes, in slow-moving streams, often in
- Habit: Partially submersed perennial with a stout rhizome.
- Stems: Slender, unbranched, not flattened, up to 1 1/2 feet long, smooth.
- Leaves: Floating leaves leathery, ovate to elliptic, up to 4 inches long, up to 2 1/2 inches wide, rounded at the tip, rounded or heart-shaped at the base, without teeth, smooth, with long leaf stalks; submersed leaves linear, up to 8 inches lon
- Flowers: Densely crowded into spikes, the spikes up to 2 1/2 inches long.
- Sepals: 4, free from each other, greenish, up to 1/8 inch long.
- Petals: O.
- Stamens: 4.
- Pistils: 4, free from each other, smooth.
- Fruits: Achenes ellipsoid to obovoid, up to 1/4 inch long, with a curved beak about 1/24 inch long.
- Notes: The achenes are eaten by waterfowl.
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