Basal leaves 3-foliolate; blade 1-5 × 1.5-6 cm; leaflets petiol-ulate, deeply lobed. Cauline leaves 3-foliolate; blade 3 × 4 cm; leaflet lobes more than 1/2 length of leaflet, distal segments laciniate. 2n = 14. Flowering May-Aug. Shaded, moist woods; 0-900 m; B.C.; Oreg., Wash. The terminal leaflet of var. laciniata is rhombic.