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Genus Hydrilla Family Hydrocharitaceae

Description: Dioecious aquatic perennials with submerged leaves and floating flowers.

Leaves mostly whorled.

Inflorescences unisexual, axillary. Flowers with 2 perianth whorls, segments ± equal in size. Male flowers solitary, separating when in bud and rising to the surface, opening when free-floating; spathe sessile in leaf axils; hypanthium absent in male flowers, thread-like in female flowers; stamens 3. Female flowers solitary; ovary 1-locular; styles 3.

Fruit ± cylindrical, seeds 2–6.


Distribution and occurrence: World: 1 species, Australia, Africa & Asia. Australia: 1 species (native).

Text by S. W. L. Jacobs
Taxon concept:

One species in NSW: Hydrilla verticillata

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