Monoclinous, emersed. Stems short, rhizomatous; stolons occasional. Leaves basal, submersed or emersed; petiole flattened; blade ovate to linearlanceolate, the apex acute, the base acute to attenuate. Inflorescence a 1-3-flowered umbel, the flowers occasionally replaced by bulbils; sepals ovate, membranaceous reflexed after anthesis; petals delicate, white or pinkish; stamens (6-)9- 12; carpels free on an elongated receptacle, to 70. Achenes laterally compressed, with a dorsal wing, nearly semicircular, without sculpturing.