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Text 
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)
Colorado Department of
Agriculture ·
700 Kipling Street ·
Suite 4000 ·
Lakewood, CO 80215-8000 ·(303) 239-4100