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| Distribution | A genus of about 7 species, nearly cosmopolitan in distribution.
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Leaves
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Fronds free-floating on or just beneath water surface, solitary or cohering in colonies, usually greenish or purplish to reddish on lower surface, obovate to orbicular or greatly elongated, each one with a single peltately attached root.
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Flowers
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Flowers 3, borne in a pouch, 2 male and 1 female, enclosed in a membranous sheath in a marginal cleft of the frond, opening along the side or nearly closed; ovules 1-3.
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Seeds
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Seeds 1-6, usually ribbed and with minute transverse striations.
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