Potamogeton natans L.
Family: Potamogetonaceae
common pondweed, floating pondweed, floating-leaf pondweed
Potamogeton natans image
Andrew Hipp  
Potamogeton natans image
Paul Skawinski  
Potamogeton natans image
University of Wisconsin-Stevens Point, Robert W. Freckmann Herbarium (UWSP)  
Etymology: Potamogeton: from Greek potamos, "a river," and geiton, "a neighbor," because of the habitat
Plants: perennial, submersed aquatic; stems to 7' long; red spotted rhizomes
Leaves: alternate, entire, with prominent midvein; floating - heart-shaped base; submersed - stalk-like with no blade, held 90deg. off stem, lay flat on water
Flowers: green-brown, small; inflorescence dense cylindrical spike above water
Fruits: oval-to-ovate, plump, dry seed with a short, wrinkled beak
Habitat: water < 6' deep
Conservation Status: Native