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Perennial herb from a woody stem-base, rarely with very short rhizomes; stems erect, (20) 30-70 cm tall.
Basal, usually 5 to 10, ascending, mostly 5-10 cm long, palmately 3- (5-) parted, the divisions narrowly triangular, 3-cleft over half their length, the segments more or less 3-toothed, short appressed-hairy; stalks 9-21 cm long.
Inflorescence a (1-) 2- to 8-flowered, terminal cyme; flower stalks long soft-hairy; involucral bracts 3 to 7 (-9), leaf-like, stalked, similar to basal leaves; petals absent; sepals usually 5, petal-like, green to whitish, oblong to elliptic or egg-shaped, 5-15 mm long, 3-6 mm wide, silky-hairy on outside, smooth inside; stamens 50-75.
Achenes, numerous in a cylindric head on stalks 10-30 cm long, the achenes egg-shaped, 2-3 mm long, 1.5-2 mm wide, not winged, woolly-hairy; beaks bent back at tip, 0.5-1 mm long, hidden by hairs, smooth.
Source: The Illustrated Flora of British Columbia