UW Burke Herbarium species comparison

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Egeria densa

Brazilian waterweed, South American waterweed
Habit Submersed, dioecious perennials, with sparingly-branching and nodally-rooting stems.
Leaves

Stems very leafy;

leaves in whorls of 4 or 6, 2.5-3 cm. long and 2-3 mm. broad, acuminate.
Flowers

Both pistillate and staminate flowers with a long, thin, stipe-like tubular calyx, enclosed at the base in fused bracts;

flowers 1-several in the bracts;

calyx lobes 3, 4-5 mm. long, greenish;

petals 5, white, twice as long as the calyx lobes;

stamens 9;

stigmas 3, bi-lobed.
Fruits

Fruit berry-like, uncommon.

Egeria densa
Flowering time July-September
Habitat Ponds, lakes, and slow-moving water at low elevation.
Distribution
Occurring chiefly west of the Cascades crest in Washington; southwestern British Columbia to California, east across the southern half of the United States to the Atlantic.
[WildflowerSearch map]
[BONAP county map]
Origin Introduced from South America
Conservation status Not of concern
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Unless otherwise noted, all data comes from the University of Washington's Burke Herbarium.



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Choose a data source: Flora of North America, OregonFlora, UW Burke Herbarium

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