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genus Potamogeton, of which many species are found in ponds or slow-moving rivers. Choke pondweed, an American water weed (Anarcharis, or Elodea, Canadensis.) See Anacharis. -- Horned pondweed, the Zannichellia palustris, a slender, branching aquatic plant, having pointed nutlets.

Any plant of the order Naiadaceæ, such as eelgrass, pondweed, etc.

A genus of plants of the Naiadaceæ, or Pondweed family. Zostera marina is commonly known as sea wrack, and eelgrass.