USWildflowers Daily Plant 12/16/2012
Photo from 6/13/2009. Location: Rutherford County, TN
Bristle Thistle, an introduced and possibly invasive species. For more information go to the Carduus nutans detail page.
Bristle Thistle, Musk Thistle, Nodding Thistle – Carduus nutans
Also Daily Plant 11/30/2010, 12/16/2011