Scientific Name: Cirsium muticum Michx.
Caption: Cirsium muticum thistle heads
Photographer: Emmet J. Judziewicz @University of Wisconsin - Stevens Point
Image Source: http://compositae.lifedesks.org/node/105
Notes: Cirsium muticum thistle heads<br>
Copyright: http://creativecommons.org/licenses/by-nc/3.0/
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