Echinops sphaerocephalus L.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Species Description - Coarse, branching, to 2.5 m; stem spreading-hairy (some of the hairs gland-tipped), also tomentose above; lvs white-tomentose beneath, green and merely scabrous or hirsute above (many of the hairs gland-tipped), sessile and clasping (at least the middle and upper), not decurrent, pinnatifid, to 3.5 × 2 dm; secondary heads naked-pedunculate, 3.5–6 cm thick, pale bluish; proper invol 1.5–2 cm, its bracts puberulent on the back; subtending bristles seldom half as long as the invol; 2n=30, 32. Waste places; native of Eurasia, sometimes cult., and casually established as a weed here and there in e. U.S. and adj. Can. July–Sept.