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

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

Introduction to Vascular Plants

Distribution of Egeria densa
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Species Information

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Illustration Source: The Illustrated Flora of British Columbia

General:
Perennial aquatic herb from a fibrous root; stems solitary, sparingly branched.

Leaves:
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.

Flowers:
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.

Fruits:
Capsules, cylindric or egg-shaped; seeds several.

Notes:
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

Climate

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.

Status Information

Origin Status	Provincial Status	BC List (Red Blue List)	COSEWIC
Exotic	SNA	Exotic	Not Listed

BC Ministry of Environment: BC Species and Ecosystems Explorer, the authoritative source for conservation information in British Columbia.

Synonyms and Alternate Names

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

Taxonomic and Nomenclatural Links

Flora North America treatment for Hydrocharitaceae
Flora North America treatment for Egeria densa
Genetic information (NCBI Taxonomy Database)
International Plant Names Index
Taxonomic Information from the World Flora Online
Integrated Taxonomic Information System

Additional Range and Status Information Links

Burke Museum of Natural History (Washington State records)
CalFlora
Consortium of Pacific Northwest Herbaria records
Jepson Interchange
NatureServe Explorer
USDA

Additional Photo Sources

Images From CalPhoto
UT Austin's Native Plant Database
Google Image Search
Flickr Image Search

General References

Google Scholar Search
Family References
General Botanical References for BC

Recommended citation: Author, Date. Page title. In Klinkenberg, Brian. (Editor) 2020. E-Flora BC: Electronic Atlas of the Plants of British Columbia [eflora.bc.ca]. Lab for Advanced Spatial Analysis, Department of Geography, University of British Columbia, Vancouver. [Accessed: 2025-01-18 5:55:47 AM ]

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