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You are here: Home / Aquatic Species / Species Profiles / Hydrilla
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Species Profiles

Hydrilla

HydrillaScientific name: Hydrilla verticillata (L. f.) Royle

Common names: Hydrilla, Florida elodea, water thyme, Indian star-vine

Click image to enlarge

Native To: Eastern Hemisphere; U.S. strains possibly originated in Asia (Balciunas et al. 2002)

Date of U.S. Introduction: 1950s (Masterson 2007)

Means of Introduction: Aquarium trade (Masterson 2007)

Impacts: Crowds out native species; impedes irrigation and boating (Balciunas et al. 2002)

Current U.S. Distribution:

Federally Regulated:

  • Listed as a Federal Noxious Weed under the Plant Protection Act, which makes it illegal in the U.S. to import or transport between States without a permit (USDA, APHIS - Noxious Weeds Program)

Images:

Video:

Selected Internet Resources:

Federal Government

Potential Use of Insect Biocontrol Agents for Reducing the Competitive Ability of Hydrilla verticillata, ERDC/EL SR-00-1 (Feb 2000; PDF | 1.93 MB)
DOD. USACE. Engineer Research and Development Center. Environmental Laboratory.
Controls; Research

Status of Waterhyacinth/Hydrilla Infestations and Associated Biological Control Agents in Lower Rio Grande Valley Cooperating Irrigation Districts, ERDC/EL SR-00-11 (Sep 2000; PDF | 5.25 MB)
DOD. USACE. Engineer Research and Development Center.
Controls; Research

Hydrilla - Aquatic Plant Information System (APIS)
DOD. USACE. Engineer Research and Development Center. Environmental Laboratory.
Identification/Description; Introduction History; Impacts; Habitat; Distribution; Dispersion; Controls

Hydrilla verticillata
Integrated Taxonomic Information System.
Taxonomy

Hydrilla - Plant Invaders of Mid-Atlantic Natural Areas (2002)
DOI. National Park Service and Fish and Wildlife Service.
Identification/Description; Photographs; Distribution; Introduction History; Impacts; Controls

Hydrilla verticillata Article Citation Search - AGRICOLA Database
USDA. National Agricultural Library.
Research; Special Note: NAL Catalog Search (resources)

Hydrilla verticillata - Germplasm Resources Information Network (GRIN)
USDA. ARS. National Genetic Resources Program.
Taxonomy; Legal Aspects

Hydrilla - Biological Control of Invasive Plants in the Eastern United States (Aug 2002)
BugwoodWiki.
Published by: USDA. Forest Service. Publication FHTET-2002-04.
Taxonomy; Identification/Description; Photographs; Distribution; Introduction History; Impacts; Life Cycle; Habitat; Controls

PLANTS Database - Hydrilla
USDA. NRCS. National Plant Data Center.
Taxonomy; Distribution; Legal Aspects

Hydrilla verticillata - Indian River Lagoon Species Inventory
Smithsonian Institution. Smithsonian Marine Station at Fort Pierce.
Taxonomy; Identification/Description; Photographs; Introduction History; Life Cycle; Habitat; Distribution

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State Government

Hydrilla, Egeria, and Elodea - EncycloWeedia
California Department of Food and Agriculture.
Identification/Description; Photographs; Habitat; Distribution; Dispersion; Controls

Hydrilla Program
California Department of Food and Agriculture.
Identification/Description; Photographs; Habitat; Distribution; Dispersion; Controls

Hydrilla
Colorado Department of Agriculture. Noxious Weed Management Program.
Identification/Description; Photographs; Introduction History; Impacts; Distribution; Controls

Hydrilla - Weed Alert (PDF | 739 KB)
Florida Fish and Wildlife Conservation Commission.
Introduction History; Photographs; Illustrations; Impacts; Distribution

Hydrilla - Vermont Invasive Exotic Plant Fact Sheet (PDF | 89 KB)
Vermont Agency of Natural Resources. Environmental Conservation.Identification/Description; Illustrations; Introduction History; Impacts; Distribution; Controls

Hydrilla - Invasive Alien Plant Species of Virginia (PDF | 117 KB)
Virginia Department of Conservation and Recreation. Natural Heritage Program; Virginia Native Plant Society.
Identification/Description; Illustrations; Introduction History; Impacts; Habitat; Distribution; Controls

Hydrilla
State of Washington. King County Department of Natural Resources. Water and Land Resources Division.
Identification/Description; Illustrations; Introduction History; Dispersion; Controls

Hydrilla - Non-Native Freshwater Plants
Washington State Department of Ecology. Water Quality Program.
Identification/Description; Photographs; Illustrations; Introduction History; Impacts; Life Cycle; Habitat; Distribution; Controls

Class A Noxious Weed: Hydrilla
Washington State Noxious Weed Control Board.
Taxonomy; Identification/Description; Photographs; Impacts; Habitat; Distribution; Dispersion; Controls; Legal Aspects

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University/Academic

Hydrilla - Invasive Plant Species of Alaska (PDF | 113 KB)
University of Alaska - Anchorage. Alaska Natural Heritage Program.
Identification/Description; Photographs; Impacts; Habitat; Controls

Hydrilla verticillata - Invasive Plant Atlas of New England (IPANE)
University of Connecticut. Ecology and Evolutionary Biology.
Taxonomy; Identification/Description; Photographs; Introduction History; Distribution; Dispersion; Controls

Hydrilla - Nonindigenous Aquatic and Selected Terrestrial Species of Florida
University of Florida. Center for Aquatic and Invasive Plants.
Photographs; Introduction History; Impacts; Distribution; Dispersion; Controls

Hydrilla verticillata "The Perfect Aquatic Weed" (Kenneth A Langeland)
University of Florida. Center for Aquatic and Invasive Plants.
Identification/Description; Photographs; Illustrations; Introduction History; Impacts; Life Cycle; Distribution; Special Note: References

Hydrilla - Invasive Plant Atlas of the United States
University of Georgia. Center for Invasive Species and Ecosystem Health.
Taxonomy; Identification/Description; Photographs; Introduction History; Distribution

Aquatic Invaders: Hydrilla - Aquatic Invader Toolkit (PDF | 673 KB)
Illinois-Indiana Sea Grant.
Photographs; Introduction History; Impacts; Life Cycle; Habitat; Distribution; Dispersion; Controls

Invasive Species of the Gulf Coast: Hydrilla
Louisiana Sea Grant. Louisiana Marine Education Resources.
Identification/Description; Photographs; Introduction History; Impacts; Habitat; Distribution; Controls

Hydrilla verticillata - Maine Invasive Plants Bulletin no. 2527
University of Maine. Cooperative Extension.
Identification/Description; Photographs; Impacts; Habitat; Distribution; Controls

Managing Hydrilla (PDF | 122 KB)
University of Nevada - Reno. Cooperative Extension.
Identification/Description; Photographs; Impacts; Habitat; Controls

Hydrilla, Aquatic Weed Fact Sheet (PDF | 158 KB)
North Carolina State University. Department of Crop Science.
Identification/Description; Photographs

Hydrilla (PDF | 86 KB)
University of Pennsylvania. Morris Arboretum.
Identification/Description; Photographs; Illustrations; Introduction History; Impacts; Habitat; Distribution; Dispersion; Controls

Hydrilla - Biological Control of Weeds in Texas
Texas A&M University. Entomology.
Identification/Description; Introduction History; Life Cycle; Habitat; Distribution; Controls; Special Note: References

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International

Hydrilla verticillata - Invasive Species Compendium
Centre for Agricultural Bioscience International (CABI).
Taxonomy; Identification/Description; Photographs; Impacts; Life Cycle; Habitat; Distribution; Controls

Hydrilla verticillata (aquatic plant) - ISSG Global Invasive Species Database
World Conservation Union. Invasive Species Specialist Group.
Taxonomy; Identification/Description; Photographs; Impacts; Life Cycle; Habitat; Distribution; Controls

Hydrilla verticillata - Plant Pest Control (PDF | 58 KB)
Hawke's Bay Regional Council (New Zealand).
Identification/Description; Photographs; Impacts; Distribution; Controls

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Organizations

Hydrilla verticillata - Invasive Plants of California's Wildlands Book (2000)
California Invasive Plant Council.
Identification/Description; Photographs; Illustrations; Life Cycle; Habitat; Distribution; Dispersion; Controls

Hydrilla
Colorado Weed Management Association.
Identification/Description; Photographs; Life Cycle; Habitat; Distribution; Dispersion

Hydrilla verticillata
Discover Life.
Identification/Description; Photographs; Illustrations; Introduction History; Impacts; Life Cycle; Habitat; Distribution; Dispersion; Controls

Hydrilla verticillata (PDF | 60 KB)
Florida Exotic Pest Plant Council.
Identification/Description; Photographs; Impacts; Life Cycle; Habitat; Distribution

Hydrilla - Maine's Interactive Field Guide to Aquatic Invaders and Their Native Look Alikes
Maine Volunteer Lake Monitoring Program. Maine Center for Invasive Aquatic Plants.
Identification/Description; Photographs; Illustrations; Introduction History; Life Cycle; Habitat; Distribution

Hydrilla
Massachusetts Introduced Pests Outreach Project.
Identification/Description; Photographs; Impacts; Habitat

Hydrilla verticillata
Pacific Island Ecosystems at Risk.
Identification/Description; Life Cycle; Habitat; Distribution; Controls

Hydrilla verticillata
Texasinvasives.org.
Taxonomy; Identification/Description; Photographs; Introduction History; Impacts; Life Cycle; Habitat; Distribution; Dispersion; Controls; Special Note: References

Hydrilla - Practical Guidebook to the Control of Invasive and Aquatic Wetland Plants of the San Francisco Bay-Delta Region
San Francisco Estuary Institute.
Identification/Description; Photographs; Impacts, Habitat; Controls

Hydrilla - Southeast Exotic Pest Plant Council Invasive Plant Manual
Southeast Exotic Pest Plant Council.
Identification/Description; Photographs; Introduction History; Habitat; Controls

Hydrilla: Invader that Chokes Waters
National Environmental Coalition on Invasive Species.
Introduction History; Photograph; Impacts; Distribution

Citations

Balciunas, J.K., M. J. Grodowitz, A.F. Cofrancesco and J.F. Shearer. 2002. Hydrilla. In: Biological Control of Invasive Plants in the Eastern United States. United States Department of Agriculture Forest Service. Forest Health Technology Enterprise Team. Morgantown, West Virginia. FHTET-2002-04.

Masterson, J. 2007. Hydrilla verticillata. In: Indian River Lagoon Species Inventory. Smithsonian Marine Station.

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Last Modified: Jul 01, 2014
 
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