Monographs Details: Onopordum
Authority: Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Description:Genus Description - Similar to Cirsium, differing chiefly in the receptacle, which is flat, fleshy, and honey-combed, often with short bristle-tips on the partitions, but not densely bristly; pappus-bristles naked or plumose; spiny biennials, mostly tomentose or woolly. 40, sw. and c. Asia.