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Genus :


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Species of this Genus


Densely prickly herbs with thick rootstocks. Leaves orbicular, floating. Flowers partially submerged, epigynous. Sepals 4, inserted on the edge of the torus above the carpels. Petals numerous in 3-5 whorls. Stamens numerous, many-seriate, fascicled in bunches, filaments linear. Ovary 5-many celled with a cup-like depression above formed by the radiating stigmas, ovules 2-3 in each locule. Berry spongy, crowned by the persistent sepals and covered with stout prickles. Seeds many with pulpy aril.