Pondweed /(?)/

Pond·weed

Pondweed

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

Phrases & Compounds
Choke pondweed
an American water weed (Anarcharis Canadensis, syn. Elodea Canadensis.) See Anacharis.
Horned pondweed
the Zannichellia palustris, a slender, branching aquatic plant, having pointed nutlets.