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

Introduction to Vascular Plants


© Gerry & Wendy Ansell     (Photo ID #70918)


E-Flora BC Static Map

Distribution of Egeria densa
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Species Information

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.

SourceThe Illustrated Flora of British Columbia


If more than one illustration is available for a species (e.g., separate illustrations were provided for two subspecies) then links to the separate images will be provided below. Note that individual subspecies or varietal illustrations are not always available.

Habitat and Range

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

SourceThe Illustrated Flora of British Columbia


Synonyms and Alternate Names:
Anacharis densa (Planch.) Victorin
Elodea densa (Planch.) Caspary
Philotria densa (Planch.) Small & H. St. John