A bristly, prickly, coarse biennial, tall and stout, 3 to 6 feet high. The stem, branches, peduncles, midribs of the leaves and the involucre all bear many short prickles. Leaves sessile, lanceolate or oblong, often 1 foot long. Flowers lilac-colored in dense, cylindrical heads which are 3 to 5 inches long, made up of long, spiny bracts in the axils of which are borne the flowers, which usually are exceeded in length by the spiny bracts. The lower flowers open first and appear as a violet or bluish ring of bloom around the spiny head, the ring of flowers gradually spreading upward.
Memoir 15 N. Y. State Museum Plate 215
A. Wild Or Common Teasel; Card Teasel - Dipsacus sylvestris