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Najadaceae A family of aquatic monocotyledons comprising slender plants that have submerged, linear, opposite to whorled leaves with sheathing bases. The flowers are minute and unisexual. The male flower consists of 1 stamen in a 2-lipped perianth, the female of 1 carpel which is usually without perianth. The fruit is a tiny nut. There is 1 genus and 35 species, occurring in temperate and humid tropical regions.