Resembling no. 1 [Achillea ptarmica L.]; stems 5-8 dm; lvs 5-10 cm נ4-8 mm, incised; heads in a short, crowded, corymbiform infl; rays 6-13, 1-2 mm; disk-fls 25-30; 2n=36. Woods; ne. Asia to Man. and Minn.; Gasp顰eninsula, Que. July, Aug.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.