pondweed

Any of various submerged or floating aquatic plants of the genus Potamogeton, having inconspicuous flowers borne in small spikes.

An aquatic herb of the genus Potamogeton, found in numerous Species in both he mispheres.

Any aquatic plant of the genus Potamogeton, of which many species are found in ponds or slow-moving rivers.

an American water weed (Anarcharis Canadensis, syn. Elodea Canadensis.) See Anacharis.

the Zannichellia palustris, a slender, branching aquatic plant, having pointed nutlets.

Any plant of the genus Potamogeton, that grows in ponds or similar aquatic conditions; extended to other similar plants.

submerged freshwater perennials

any of several submerged or floating freshwater perennial aquatic weeds belonging to the family Potamogetonaceae