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United States Department of Agriculture

Agricultural Research Service


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Image Number K10651-1

Flower head of Canada thistle, Cirsium arvense, a particularly troublesome perennial weed throughout the United States. Canada thistle seeds are among the many specimens in ARS' extensive weed seed collection, located in Beltsville, Maryland.

Photo by Peggy Greb.



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Last Modified: 9/16/2016
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