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Genus :


Family :



Floating or creeping, aquatic, perennial herbs. Leaves alternate, often subopposite, cordate, elliptic or ovate, entire. Flowers white or yellow, clustered at the nodes of peduncle. Sepals 5 or 4. Petals 5 or 4, ciliate, fimbriate or with longitudinal fold down their middle. Stamens 5 or 4, epipetalous. Ovary superior, 1-celled, stigmas 2-lobed. Capsules ellipsoid, ovoid or globose, subindehiscent. Seeds many, discoid, tuberculate, reticulate or smooth, rarely winged.

Key to the species

Serial Key Reference
1a. Stems rooting at the nodes; corolla 5-lobed 2
1b. Stems not rooting at the nodes; corolla 4-lobed N. parvifolium
2a. Corolla lobes entire, glabrous, with a longitudinal fold down the middle N. hydrophylla
2b. Corolla lobes fimbriate, densely papillose, without a fold down the middle N. indicum