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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:


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


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.

Brazilian Elodea
Northeast Aquatic Nuisance Species Panel

Invasive Species Compendium - Egeria densa
CAB International.

Egeria densa
Pacific Island Ecosystems at Risk.

Global Invasive Species Database - Egeria densa (aquatic plant)
World Conservation Union. Invasive Species Specialist Group.


Egeria densa Planch. (Brazilian Elodea) - Aquatic Plant Information System (APIS)
DOD. USACE. Engineer Research and Development Center. Environmental Laboratory.

Germplasm Resources Information Network (GRIN) - Egeria densa
USDA. ARS. National Genetic Resources Program.

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

Weed Profile: Leafy elodea
New South Wales Department of Primary Industries (Australia).

Pest Plant Risk Assessment: Dense Waterweed (Aug 2008; PDF | 319 KB)
Queensland Department of Primary Industries (Australia). Biosecurity Queensland.


Hydrilla, Brazilian elodea, and Common elodea - EncycloWeedia
California Department of Food and Agriculture.

S. American Waterweed: An Invasive Aquatic Plant (2002; PDF | 330 KB)
Massachusetts Department of Conservation and Recreation. Water Resources. Lakes and Ponds Program.

Invasive Plants in Pennsylvania: Brazilian Waterweed (PDF | 540 KB)
Pennsylvania Department of Conservation and Natural Resources.

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

Brazilian Elodea - Vermont Invasive Exotic Plant Fact Sheet (PDF | 97 KB)
Vermont Agency of Natural Resources. Environmental Conservation.

Brazilian elodea
State of Washington. King County Department of Natural Resources. Water and Land Resources Division.

Brazilian Elodea - Non-Native Freshwater Plants
Washington State Department of Ecology. Water Quality Program.

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.

Aquatic Invaders: Brazilian Elodea - Aquatic Invader Toolkit (PDF | 524 KB)
Illinois-Indiana Sea Grant.

Brazilian Waterweed - Maine Invasive Plants Bulletin no. 2524
University of Maine Cooperative Extension.

Egeria - Aquaplant
Texas A&M University. Texas Cooperative Extension.


Brazilian Waterweed - Maine's Interactive Field Guide to Aquatic Invaders and Their Native Look Alikes
Maine Volunteer Lake Monitoring Program. Maine Center for Invasive Aquatic Plants.

Brazilian waterweed - Practical Guidebook to the Control of Invasive and Aquatic Wetland Plants of the San Francisco Bay-Delta Region
San Francisco Estuary Institute.


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: Mar 31, 2015
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