Glandular-pubescent and hirsute, short-lived perennial (seldom biennial) 1-3 dm, branched at least above; lvs dissected into blunt, linear oblong segments, the lower lvs long-petioled, the upper short-petioled to sessile and less divided or entire; hypanthium and lanceolate sep (these 2 mm) hispid; pet white, barely exceeding the sep. Dry plains and open hills; Alas. to Colo. and Utah, e. to w. Minn., and disjunct at Keweenaw Point, Mich.; c. and ne. Asia. June, July. (C. nuttallii)
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.