Colorado Department of Agriculture
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Canada thistle



CANADA THISTLE
Scientific name:  Cirsium arvense

Photos: Kelly Uhing & Steve Dewey, Utah State University & Chris Evans, University of Georgia; www.forestryimages.com
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Canada thistle fact sheet (PDF)

Picture of Canada Thistle Picture of Canada Thistle, close up courtesy of Steve Dewey Utah State University Picture of Canada Thistle, close up courtesy of Chris Evans Picture of Canada Thistle

Picture of a map that shows infestation.