Originally: either of two aquatic plants formerly considered to belong to the same genus, (more fully broad-leaved pondweed) Potamogeton natans…

A pondweed of the genus Potamogeton.

†(a) a pondweed (genus Potamogeton) (obsolete); (b) any of the floating aquatic plants constituting the genus Trapa (family Lythraceae), native to…

Originally: any of several kinds of aquatic plant (not identified). Later: spec. (Potamogeton) a cosmopolitan genus of aquatic plants with…

any of several pondweeds of the genus Potamogeton, esp. P. crispus; also called water caltrops.

Chiefly English regional. Any of several aquatic plants found in still waters where pike breed and which were formerly believed to be the actual…

With distinguishing word: any of certain aquatic plants belonging to other genera of the family Potamogetonaceae or to other families.

A provincial name given to several large-leaved aquatic plants (‘docks’), probably from the floating leaf.

a local name of pondweed.

the pondweed Potamogeton natans, the flat leaves of which were formerly supposed to give shelter to fish.