Fibrous-rooted perennial 5-15 dm from a short rhizome; stems hairy at least at the nodes; basal and cauline lvs similar, pinnately divided into 11-21 lanceolate, dentate segments; petioles of the upper lvs progressively shorter; infl large and open, the lower branches often remote from the upper; cor obconic, the tube 4 mm, the lobes 1 mm; fr lance-oblong, 3-5 mm, glabrous; 2n=14, 28, 56. Native of Eurasia, escaped from cult. here and there in our range. May-Aug.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.