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United States Department of Agriculture

Agricultural Research Service

ARS Photo Library

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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.

640 pixels wide: (k10651-1.jpg)

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Last Modified: 5/23/2006
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