Purple Star Thistle Resources
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DOI. NPS. Science of the American Southwest.
California Invasive Plant Council.
Texas State University System. Texas Invasive Species Institute.
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.
Google. YouTube; Elsberg Studios.
Made for the Idaho Weed Awareness Campaign.