C. vulgaris: biennial; stem erect, corymbose, 6-8 inches high; leaves oblong-lanceolate, toothed or pinnatifid, very prickly; flower-heads hemispherical, 3-4 in a small terminal corymb, the outer involucral bracts broadly lanceolate, bordered with very prickly teeth or lobes, the inner ones linear, entire, with smooth and shining, horizontally-spreading tips. - Dry, hilly pastures and fields. Fl. July to September.