thistle

Cirsium P. Mill.

Selected Images from Invasive.org

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Plant(s) Fraser Experimental Forest, Arapaho-Roosevelt National Forest, north-central Colorado
Dave Powell, USDA Forest Service (retired), Bugwood.org
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Plant(s) clockwise from top left: Musk, Bull, Scotch, and Canada thistle
Steve Dewey, Utah State University, Bugwood.org
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Flower(s) Bull thistle - left; Musk thistle - right
Steve Dewey, Utah State University, Bugwood.org
Additional Resolutions & Image Usage
Flower(s) Bull thistle - left; Canada thistle - right
Steve Dewey, Utah State University, Bugwood.org
Additional Resolutions & Image Usage
Foliage
Mary Ellen (Mel) Harte, , Bugwood.org
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Feature(s) bracts
Mary Ellen (Mel) Harte, , Bugwood.org
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Flower(s)
David Cappaert, , Bugwood.org
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Flower(s)
Rebekah D. Wallace, University of Georgia, Bugwood.org
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Distribution