E-Flora BC: Electronic Atlas of the Flora of British Columbia

Egeria densa Planch.
Brazilian waterweed
Hydrocharitaceae (Tape-grass family)

Introduction to Vascular Plants

© Gerry & Wendy Ansell  Email the photographer   (Photo ID #70918)

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Distribution of Egeria densa
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Species Information

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Perennial aquatic herb from a fibrous root; stems solitary, sparingly branched.
Stem leaves in whorls of 3 (below) and 4 or 6 (above), lanceolate, 2-3.5 cm long, 2-5 mm wide, minutely sharp-toothed.
Inflorescence 2- to 4-flowered (male) or 1-flowered (female); flowers axillary, long-stalked, one per stalk; petals 3, white, egg-shaped, 8-11 mm long; sepals 3, greenish, egg-shaped, 3-5 mm long; stamens 9.
Capsules, cylindric or egg-shaped; seeds several.
Only male plants known in N America.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Lakes, ponds and streams; rare in SW BC, known only from the Victoria area; introduced from S America.

Source: The Illustrated Flora of British Columbia


The climate type for this species, as reported in the: "British Columbia plant species codes and selected attributes. Version 6 Database" (Meidinger et al. 2008), is not evaluated, unknown or variable.

Synonyms and Alternate Names

Anacharis densa (Planch.) Victorin
Elodea densa (Planch.) Caspary
Philotria densa (Planch.) Small & H. St. John

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References