Najas marina is a species of aquatic plant known by the common names spiny naiad and holly-leaved water nymph. It can be found nearly worldwide in many types of freshwater and brackish aquatic habitat, including bodies of alkaline water. This annual plant produces a slender, branching stem up to 40 or 45 centimeters in maximum length. The evenly spaced leaves are up to 4 centimeters long, 1 to 3 millimeters wide, and edged in tiny sawlike teeth. The leaf has prickles along its midvein. Minute flowers occur in the leaf axils. The plant is dioecious, with male and female flower types occurring on separate individuals.
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| Najas marina |
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