Witchweed Resources
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Search HelpU.S. Government Printing Office. Electronic Code of Federal Regulations.
USDA. APHIS. PPQ. Center for Plant Health Science and Technology; California Department of Food and Agriculture.
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.
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.