Northern Prairie Wildlife Research Center
Western Wetland Flora
Field Office Guide to Plant Species
Potamogeton praelongus Wulfen
- Family: Pondweed (Potamogetonaceae)
- Flowering: May-July
- Field Marks: The leaves of this aquatic pondweed are all submersed and clasp the stem at the base. The stems are usually zigzag and the achenes are at least 1/4 inch long.
- Habitat: Deep water in lakes and streams.
- Habit: Submersed perennial with a stout rhizome.
- Stems: Stout, zigzag, branched, olive-green to whitish, up to 1 foot long, smooth.
- Leaves: Alternate, simple, all submersed, oblong-lanceolate, up to 10 inches long, up to 1 1/2 inches wide, more or less rounded at the tip and forming a small hood, rounded to
heart-shaped at the base and clasping the stem, smooth: stipules up to 4 inches long, whitish.
- Flowers: Crowded into spikes up to 2 1/2 inches long, the spikes on stalks up to 1 1/2 feet long.
- Sepals: 4, green, free from each other, up to 1/6 inch long.
- Petals: O.
- Stamens: 4.
- Pistils: 4, free from each other, smooth.
- Fruits: Achenes obovoid, up to 1/4 inch long, up to 1/6 inch wide, smooth. with a short, persistent beak at the tip.
- Notes: The achenes are eaten bv waterfowl.
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