Northern Prairie Wildlife Research Center
Western Wetland Flora
Field Office Guide to Plant Species
Potamogeton zosteriformis Fernald
- Family: Pondweed (Potamogetonaceae)
- Flowering: July-September
- Field Marks: This pondweed may be distinguished by its 8-inch long submersed leaves up to only 1/6 inch wide, its lack of floating leaves, and its flattened, narrowly winged stems.
- Habitat: Shallow water of ponds, lakes, and streams.
- Habit: Submersed perennial herb with slender rhizomes.
- Stems: Submersed, branched, flat, narrowly winged, up to 2 feet long.
- Leaves: Alternate, simple, all submersed, linear, up to 8 inches long, up to 1/6 inch wide, rounded or pointed at the tip, sessile, finely veined, smooth; stipules up to 1 1/2 inches long.
- Flowers: Crowded together into spikes, the spikes up to 1 1/2 inches long, on flattened stalks up to 4 inches long.
- Sepals: 4, green, free from each other, up to 1/10 inch long.
- Petals: O.
- Stamens: 4.
- Pistils: 4, each with a superior ovary.
- Fruits: Achenes ellipsoid, up to 1/4 inch long, with a straight or slightly curved beak at the tip.
- Notes: The achenes are eaten by waterfowl.
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