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Potamogetonaceae
The Potamogetonaceae, commonly referred to as the pondweed family, are an aquatic family of monocotyledonous flowering plants. The roughly 120 species are spread across six genera. The largest genus in the family by far is ''Potamogeton'', which contains about 100 species.
The family has a subcosmopolitan distribution, and is considered to be one of the most important angiosperm groups in the aquatic environment because of its use as food and habitat for aquatic animals.〔Haynes, R. R. 1975. A revision of North American ''Potamogeton'' subsection Pusilli (Potamogetonaceae). Rhodora 76: 564--64〕
==Taxonomy==
The Potamogetonaceae are currently placed in the early diverging monocot order Alismatales by the Angiosperm Phylogeny Group.〔 Their concept of the family includes the plants sometimes treated in the separate family Zannichelliaceae, but excludes the genus ''Ruppia''. So circumscribed, the family currently consists of six genera: ''Althenia'', ''Groenlandia'', ''Lepilaena'', ''Potamogeton'', ''Stuckenia'', and ''Zannichellia'',〔Nunes, E.L.P., de Lima, M.C., Coan, A.I., de Chiara Moco, M.C. (2010). Contribution to the embryology of ''Potamogeton'' L. (Alismatales, Potamogetonaceae). Aquatic Botany, 93: 32-38.〕 totalling about 120 species of perennial aquatic plants.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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