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

Alligatorweed

Alligatorweed - Invasive.org

Scientific name: Alternanthera philoxeroides (Mart.) Griseb. (ITIS)

Synonym: Achyranthes philoxeroides

Common names: Alligatorweed, alligator weed, pig weed

Click image to enlarge

Selected Resources

Native To: South America (Spencer and Coulson 1976)

Date of U.S. Introduction: First reported in Alabama in 1897 (Masterson 2007)

Means of Introduction: Probably introduced through ballast water (Masterson 2007)

Impact: Forms dense mats that crowd out native species and impede recreational activities such as boating, swimming, and fishing (Texas Invasives 2007)

Current U.S. Distribution: Southeastern U.S., Califorinia

Images:

Video:

  • Alligator weed (or select Play button below)
    University of Florida. (YouTube).

Selected Resources:

Partnership

Alternanthera philoxeroides
Pacific Island Ecosystems at Risk.

Texas Invasives Database - Alternanthera philoxeroides
TexasInvasives.org.

Invasive Species Compendium - Alternanthera philoxeroides
CAB International.

Alternanthera philoxeroides (Amaranthaceae)
European and Mediterranean Plant Protection Organization.

Global Invasive Species Database - Alternanthera philoxeroides (aquatic plant, herb)
World Conservation Union. Invasive Species Specialist Group.

Government

Alternanthera philoxeroides (Mart.) Griseb. (Alligatorweed) - Aquatic Plant Information System (APIS)
DOD. USACE. Engineer Research and Development Center. Environmental Laboratory.

Germplasm Resources Information Network (GRIN) - Alternanthera philoxeroides
USDA. ARS. National Genetic Resources Program.

Alligatorweed - Biological Control of Invasive Plants in the Eastern United States (Aug 2002)
BugwoodWiki.
Published by: USDA. Forest Service. Publication FHTET-2002-04.

Alligatorweed - A Field Guide for the Identification of Invasive Plants in Southern Forests
USDA. Forest Service. Southern Research Station.; Bugwood Wiki.

PLANTS Database - Alligatorweed
USDA. NRCS. National Plant Data Center.

Indian River Lagoon Species Inventory - Alternanthera philoxeroides
Smithsonian Institution. Smithsonian Marine Station at Fort Pierce.

Fact Sheet: Alligator weed (Dec 2013; PDF | 2.53 MB)
Biosecurity Queensland (Australia).

Alligator Weed - Weed Management Guide (2003; PDF | 353 KB)
Cooperative Research Centre for Australian Weed Management.
See also: Alligator Weed Strategic Plan 2012-2017 (PDF | 1.02 MB)

Alternanthera philoxeroides - Weeds in Australia
Department of the Environment, Water, Heritage and the Arts (Australia).

Weed Profile: Alligator weed
New South Wales Department of Primary Industries (Australia).

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State

Alligatorweed - EncycloWeedia
California Department of Food and Agriculture.

Alligatorweed
South Carolina Department of Natural Resources. Aquatic Nuisance Species Program.

Alligator Weed
South Carolina Department of Natural Resources. Freshwater Fisheries Section.

Alligatorweed - Invasive Alien Plant Species of Virginia (PDF | 224 KB)
Virginia Department of Conservation and Recreation. Natural Heritage Program and Virginia Native Plant Society.

Academic

Weed Control in Natural Areas in the Western United States: Alligatorweed (2013; PDF | 196 KB)
University of California. Weed Research and Information Center.

Alligator weed
University of Florida. IFAS. Center for Aquatic and Invasive Plants.

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

Invasive Plant Atlas of the MidSouth - Alligatorweed
Mississippi State University. GeoResources Institute.

Alligator Weed
Mississippi State University Extension Service; Mississippi Agricultural and Forestry Experiment Station.

Alligator Weed - Aquaplant
Texas A&M University. Texas Agricultural Extension Service.

Professional

Alligatorweed, pig weed
Guide to Invasive Plants of the Galveston Bay Area.

Citations

Integrated Taxonomic Information System. Alternanthera philoxeroides. [Accessed Sep 10, 2014].

Masterson, J. 2007. Alternanthera philoxeroides. In: Indian River Lagoon Species Inventory. Smithsonian Marine Station.

Spencer, N.R. and J.R. Coulson. 1976. The biological control of alligatorweed, Alternanthera philoxeroides, in the Unites States of America. Aquatic Botany 2:177-190.

Texas Invasives Database. 2007. Alternanthera philoxeroides.

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Last Modified: Feb 24, 2015
 
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