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