Potamogeton x griffithii A.Benn. (pro sp.)
Family: Potamogetonaceae
Griffith's pondweed
Etymology: Potamogeton: from Greek potamos, "a river," and geiton, "a neighbor," because of the habitat
Plants: perennial aquatic; from rhizomes
Leaves: alternate, entire, with prominent midvein
Flowers: green-brown, small; inflorescence spike
Fruits: dry seed
Conservation Status: Native
Flora of North America: Flora of North America