A large handsome aquatic herb with creeping, branched rhizomes. Leaves peltate,petioles very long, smooth or with small prickles, much raised above the watersurface. Flowers solitary, large, fragrant, white or rosy with a centrally located,yellow, obconical, spongy torus in white carpels are sunken. Fruits ovoid, nut-likeachenes. (India) Perennial aquatic herb. Root-stock stout, cylindrical, embedded in the mud. Leavespeltate, radiately nerved; margins wavy; petiole long, aculeate, inserted in the middleof the leaf. Flowers large, solitary, handsome and fragrant, rosy or white. Carpelsnumerous, ovoid, fleshy, sunk separately in cavities of receptacle, maturing into nut-like achenes; skin hard and blackish-brown when ripe (Vietnam)