Perennial from a stout caudex, erect, 4-8 dm; basal lvs long-petioled, palmately compound, with 5-7 lfls, the cauline much smaller, often with 3-lfls, becoming bract-like in the infl; lfls oblanceolate to narrowly obovate, densely tomentose beneath, green and often glabrous above, cleft well over halfway to the midrib into narrow segments; infl an open cyme with ascending branches; pet yellow, 6-10 mm; anthers 1 mm; 2n=56-70. Prairies, rocky banks, and dry woods; s. B.C. to Oreg., e. to Sask. and Mont.; vicinity of Keweenaw Point, Mich. July, Aug. (P. gracilis, misapplied)

Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.

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