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A monotypic family consisting solely of Hippuris vulgaris (mare's-tail) which is a perennial aquatic herb with linear leaves in whorls. It is superficially like Equisetum but is a flowering plant with inconspicuous flowers, each of 1 stamen and an inferior ovary, in the axils of those leaf-whorls that are emergent from the water. It is distributed in Europe, western Asia, and N. Africa.

Subjects: Plant Sciences and Forestry.

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