Najas is the botanical name of a genus of aquatic plants. It is cosmopolitan in distribution, totalling a few dozen species. It usually is taken as constituting (by itself) the family Najadaceae.
The APG II system, of 2003 (unchanged from the APG system, of 1998), places the genus in family Hydrocharitaceae, in the order Alismatales of the monocots.
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