
1) Aquatic plant 2) Hydrophyte 3) Hydrophytic plant 4) Submerged perennials 5) Water plant
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1) Ditch moss 2) Elodea
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Pondweed refers to many species and genera of aquatic plants and green algae: ...
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http://en.wikipedia.org/wiki/Pondweed

• (n.) Any aquatic plant of the genus Potamogeton, of which many species are found in ponds or slow-moving rivers.
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http://thinkexist.com/dictionary/meaning/pondweed/

any of several cosmopolitan freshwater plants sometimes grown in ponds or aquariums. They belong to two families: the Potamogetonaceae (pondwood ...
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http://www.britannica.com/eb/a-z/p/92

(Potamogeton) These hardy, aquatic perennials are natives of Europe and are naturalized in the ponds, rivers, lakes and streams across the northeastern and north central parts of the U.S. P. crispus is an attractive plant that grows submerged beneath the water. Commonly known as the Curled Pondweed, the stems of this plant can grow13 feet long or m...
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http://www.encyclo.co.uk/local/10004
Pond'weed` noun (Botany) Any aquatic plant of the 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 ,...
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http://www.encyclo.co.uk/webster/P/126

[
n] - any of several submerged or floating freshwater perennial aquatic weeds belonging to the family Potamogetonaceae
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http://www.webdictionary.co.uk/definition.php?query=pondweed

Any of a group of aquatic plants that either float on the surface of the water or are submerged. The leaves of floating pondweeds are broad and leathery, whereas leaves of the submerged forms are narrower and translucent; the flowers grow in green spikes. (Genus
Potamogeton, family Potamogetonaceae.)
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https://www.encyclo.co.uk/local/21221
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