Najas flexilis (Slender Naiad) is a species of annual herb in the family Hydrocharitaceae. It has a self-supporting growth form. It is associated with freshwater habitat. Slender Naiad is native to Canada, Alaska, and the contiguous United States. It has simple, broad leaves and green flowers. It is a photoautotroph. Individuals can grow to 2.5 feet. Slender Naiad has unisexual flowers.
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