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You are here: Home / Aquatic Species / Species Profiles / Brazilian Waterweed
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Brazilian Waterweed

Brazilian WaterweedScientific name: Egeria densa Planch. (ITIS)

Common names: Brazilian waterweed, Brazilian elodea, dense waterweed, leafy elodea

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Selected Resources

Native To: South America (Cook and Urmi-König 1984)

Date of U.S. Introduction: 1893 (Cook and Urmi-König 1984)

Means of Introduction: Aquarium trade (Cook and Urmi-König 1984)

Impact: Crowds out native species (Yarrow et al. 2009)

Current U.S. Distribution:


Selected Resources:

Council or Task Force

Invasive Plants of California's Wildlands - Egeria densa
California Invasive Plant Council.
In online book: Bossard, C.C., J.M. Randall, and M.C. Hoshovsky (Editors). 2000. Invasive Plants of California's Wildlands. University of California Press. Berkeley, CA

Priority Species: Brazilian Elodea
Washington State Recreation and Conservation Office. Washington Invasive Species Council.


Pacific Island Ecosystems at Risk (PIER) - Egeria densa
USDA. FS. Institute of Pacific Islands Forestry.

Invasive Plant Atlas of New England (IPANE) - Brazilian Water-weed
University of Georgia. Center for Invasive Species and Ecosystem Health.

Invasive Plant Atlas of the United States - Brazilian Waterweed
University of Georgia. Center for Invasive Species and Ecosystem Health.

NEANS Panel Online Guide - Brazilian Elodea
Northeast Aquatic Nuisance Species Panel.

Invasive Species Compendium - Egeria densa
CAB International.

Plantwise Technical Factsheet - Leafy Elodea (Egeria densa)
CABI. Plantwise Knowledge Bank.

Global Invasive Species Database - Egeria densa (aquatic plant)
IUCN. Species Survival Commission. Invasive Species Specialist Group.

Federal Government

Nonindigenous Aquatic Species Database: Fact Sheet - Brazillian Waterweed
DOI. USGS. Wetland and Aquatic Research Center.
Provides distribution maps and collection information (State and County).

U.S. National Plant Germplasm System - Egeria densa
USDA. ARS. National Genetic Resources Program. GRIN-Global.

PLANTS Database - Brazilian Waterweed
USDA. NRCS. National Plant Data Center.

National Exotic Marine and Estuarine Species Information System (NEMESIS): Chesapeake Bay Introduced Species Database - Egeria densa
Smithsonian Institution. Smithsonian Environmental Research Center. Marine Invasions Research Lab.

International Government

Weeds in Australia - Dense Waterweed (Egeria densa)
Australian Government. Department of the Environment and Energy.

NSW WeedWise: Leafy elodea
New South Wales Department of Primary Industries (Australia).

Invasive Plants: Other Invasive Plants - Dense Waterweed
Queensland Business and Industry Portal (Australia).

State Government

Encycloweedia: Data Sheet - Hydrilla, Brazilian elodea, and Common elodea
California Department of Food and Agriculture.
See also: Included on California's noxious weed list; see Encycloweedia: Program Details for additional resources

Invasive Plants in Pennsylvania: Brazilian Waterweed (PDF | 540 KB)
Pennsylvania Department of Conservation and Natural Resources.
See also: Invasive Plant Fact Sheets for plant species (trees, shrubs, vines, herbs and aquatic plants) that have impacted the state's natural lands

Freshwater Aquatic Invasive Species in Rhode Island: Brazilian Elodea (Sep 2010; PDF | 617 KB)
Rhode Island Department of Environmental Management. Office of Water Resources.
See also: Aquatic Invasive Plants for species of concern

King County (Washington) Noxious Weed Control Program - Brazilian elodea
King County Department of Natural Resources (Washington). Water and Land Resources Division.

Class B Noxious Weed: Brazilian Elodea
Washington State Noxious Weed Control Board.


Weed Control in Natural Areas in the Western United States: Brazilian egeria (2013; PDF | 209 KB)
University of California. Weed Research and Information Center.
See also: Weeds in Natural Areas for more information sheets

Maine Invasive Plants Bulletin: Brazilian Waterweed
University of Maine Cooperative Extension.
See also: Maine Invasive Plants & Entire Series for entire series of 22 fact sheets and invasive plants brochure (available in HTML/PDF or for purchase)

Texas A&M University. AgriLife Extension Service. Department of Wildlife and Fisheries Sciences.

Invasive Species Fact Sheets - Brazilian Elodea
University of Wisconsin Sea Grant Institute.


Maine's Interactive Field Guide to Aquatic Invaders and Their Native Look Alikes - Brazilian Waterweed
Lake Stewards of Maine.
Special Note: Formerly known as the Maine Volunteer Lake Monitoring Program.


Cook, C.D. and K. Urmi-König. 1984. A revision of the genus Egeria (Hydrocharitaceae). Aquatic Botany 19(1-2):73-96.

Integrated Taxonomic Information System. Egeria densa. [Accessed Sep 10, 2014].

Yarrow, M., V.H. Marin, M. Finlayson, A. Tironi, L.E. Delgado, and F. Fischer. 2009. The ecology of Egeria densa Planchon (Liliopsida: Alismatales): A wetland ecosystem engineer? Revista Chilena de Historia Natural 82:299-313.

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Last Modified: Sep 15, 2018
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