A floating aquatic plant (Trapa natans) native to Eurasia and Africa, bearing four-pronged nutlike fruit and grown as a pond or aquarium ornamental. Also called caltrop, water caltrop.
A tropical Asian aquatic sedge (Eleocharis dulcis) having an edible corm and cylindrical leaves.
The succulent corm of this plant, used in Asian cooking. Also called Chinese water chestnut.
