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Genus Elodea Family Hydrocharitaceae

Description: Aquatic perennials with submerged leaves and floating flowers.

Leaves mostly whorled, sessile.

Inflorescences mostly 1-flowered, spatheate. Flowers bisexual or unisexual and then plants dioecious or monoecious. Hypanthium thread-like. Perianth of 2 almost equal whorls, each with 3 membranous segments. Male flowers usually separating early and becoming free-floating; stamens 3–9. Female flowers floating; ovary 1-locular; styles 3.

Fruit capsular; seeds 1–5.


Distribution and occurrence: World: 5 species, America. Australia: 1 species (naturalized).

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

One species in NSW: Elodea canadensis

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