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It is a hairless plant that grows in shallow water, consists of a fibrous root, several basal long stemmed leaves 15–30 cm long, and a triangular stem up to 1 m tall. It has branched inflorescence bearing numerous small flowers, 1 cm across, with three round or slightly jagged, white or pale purple, petals. The flowers open in the afternoon. There are 3 blunt green sepals, and 6 stamens per flower. The carpels often exist as a flat single whorle. It flowers from June until August.
It is found on mud or in fresh waters. Found in the marshes of Sint Jansklooster, Holland.