| Noun | 1. | genus Potamogeton - a large genus of aquatic herbs found in quiet waters in temperate regions; leaves usually float on the waterliliopsid genus, monocot genus - genus of flowering plants having a single cotyledon (embryonic leaf) in the seed family Potamogetonaceae, pondweed family, Potamogetonaceae - plants that grow in ponds and slow streams; sometimes includes family Zosteraceae curled leaf pondweed, curly pondweed, Potamogeton crispus - European herb naturalized in the eastern United States and California Potamogeton gramineous, variously-leaved pondweed - of Europe (except the Mediterranean area) and the northern United States loddon pondweed, Potamogeton americanus, Potamogeton nodosus - pondweed with floating leaves; of northern United States and Europe |