Roots fibrous; stems stout, to 12 dm, densely hirsute and also finely short-hairy below; principal lfls of the larger lvs 11-23, lanceolate, sharply serrate, glandular beneath and sparingly pubescent, especially on the veins; axis of the infl glandular, finely pubescent with short, mostly ascending hairs, with or without long spreading hairs; pedicels very short, erect, at maturity abruptly deflexed at the bracteoles; hypanthium turbinate, 3 mm, glandular, sometimes with a few stiff hairs below; outer bristles much shorter than the inner. Damp woods; Conn. and N.Y. to s. Mich., s. Wis., and S.D., s. to Hispaniola and Mex.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.