
1) Genus potamogeton 2) Liliopsid genus 3) Monocot genus
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https://www.crosswordclues.com/clue/potamogeton

Potamogeton is a genus of aquatic, mostly freshwater, plants of the family Potamogetonaceae. Most are known by the common name pondweed, although many unrelated plants may be called pondweed, such as Canadian pondweed (Elodea canadensis). The genus name means `river neighbor`, originating from the Greek potamos (river) and geiton (neighbor). ==M.....
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http://en.wikipedia.org/wiki/Potamogeton

(Curled Pondweed, Pondweed) 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 ...
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http://www.encyclo.co.uk/local/10004

[
n] - a large genus of aquatic herbs found in quiet waters in temperate regions
Found on
http://www.webdictionary.co.uk/definition.php?query=Potamogeton

Potamogeton In botany, a genus of floating freshwater plants; a pondweed.
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http://www.wordinfo.info/words/index/info/view_unit/1737/2
genus Potamogeton noun a large genus of aquatic herbs found in quiet waters in temperate regions; leaves usually float on the water
Found on
https://www.encyclo.co.uk/local/20974
No exact match found.