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Witchweed Resources

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U.S. Government Printing Office. Electronic Code of Federal Regulations.

University of Georgia. Center for Invasive Species and Ecosystem Health.
Provides state, county, point and GIS data. Maps can be downloaded and shared.
California Department of Food and Agriculture.
See also: Included on California's noxious weed list; see Encycloweedia: Program Details for additional resources

Plant Health Australia.

See also: Grains - Fact Sheets for more resources

USDA. APHIS. PPQ. Center for Plant Health Science and Technology; California Department of Food and Agriculture.

IUCN. Species Survival Commission. Invasive Species Specialist Group.
University of Georgia. Center for Invasive Species and Ecosystem Health.
University of Georgia. Center for Invasive Species and Ecosystem Health.
East African Network for Taxonomy.
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.

New South Wales Department of Primary Industries (Australia).
USDA. FS. Institute of Pacific Islands Forestry.
USDA. NRCS. National Plant Data Center.

Clemson University. Regulatory Services.

USDA. ARS. National Genetic Resources Program. GRIN-Global.

Centre for Invasive Species Solutions; Atlas of Living Australia; Australian Government. Department of Agriculture, Water and the Environment.