pondweed

pondweed

[pond-weed]
noun
any aquatic plant of the genus Potamogeton, most species of which grow in ponds and quiet streams.

Origin:
1570–80; pond + weed1

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World English Dictionary
pondweed (ˈpɒndˌwiːd)
 
n
1.  any of various water plants of the genus Potamogeton, which grow in ponds and slow streams: family Potamogetonaceae
2.  (Brit) Also called: waterweed any of various unrelated water plants, such as Canadian pondweed, mare's-tail, and water milfoil, that have thin or much divided leaves

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Encyclopedia Britannica
Encyclopedia

pondweed

any of several cosmopolitan freshwater plants sometimes grown in ponds or aquariums. They belong to two families: the Potamogetonaceae (pondwood family) and the Aponogetonaceae (lattice plant family), both of which have species that develop submerged or floating leaves but frequently have emergent flowering shoots. The former group includes frog's lettuce (Potamogeton densus), of Europe and southern Asia, and P. crispus, of Europe but naturalized in the eastern United States and in California. Cape pondweed (Aponogeton distachyus), of the family Aponogetonaceae, has several varieties grown for ornament in pools or greenhouses. Many species of these families serve as food for waterfowl and as cover for fishes

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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