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A family of small, aquatic or marsh herbs in which the leaves are opposite or in whorls, and simple, with stipules. The tiny flowers are solitary or clustered in the leaf axils, with 3–5 imbricate sepals and petals, and with twice as many stamens as petals. There are 2 genera, with 32 species, with a cosmopolitan distribution.

Subjects: Plant Sciences and Forestry.

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