The water caltrop is any of three extant species of the genus Trapa: Trapa natans, Trapa bicornis and the endangered Trapa rossica. It is also known as buffalo nut, bat nut, devil pod, ling nut, lin kok, ling jow, ling kio nut, mustache nut or singhada. These species are floats annual aquatic plants, grows in water up to 5 m 16 ft deep, native to warm temperate parts of Eurasia and Africa.
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