Oregon Sea Grant.
See also: Species Guides for more resources
Orange County Coastkeeper (California).
DOC. NOAA. National Marine Fisheries Service. West Coast Region.
University of California - Riverside. Center for Invasive Species Research.
PBS. NOVA.
University of Georgia. Center for Invasive Species and Ecosystem Health.
Provides state, county, point and GIS data. Maps can be downloaded and shared.
United Nations Environment Programme.
New South Wales Department of Primary Industries (Australia).
USDA. APHIS. PPQ. Center for Plant Health Science and Technology; California Department of Food and Agriculture.
IUCN. Species Survival Commission. Invasive Species Specialist Group.
Google.
Columbia University. Center for Environmental Research and Conservation.
CAB International.
University of Georgia. Center for Invasive Species and Ecosystem Health.
Smithsonian Institution. Smithsonian Environmental Research Center. Marine Invasions Research Lab.
Great Britain Non-Native Species Secretariat.
USDA. APHIS. Plant Protection and Quarantine.
Includes species 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.
University of Florida. IFAS. Center for Aquatic and Invasive Plants.
USDA. NRCS. National Plant Data Center.
Washington State Recreation and Conservation Office. Washington Invasive Species Council.