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Perennial herb from woody stem-bases joined by rhizomes; stems erect, 15-80 cm tall, hairy.
Basal, 1 to 5, simple, ascending, strongly veined, circular in outline, 4-10 cm long, 5-15 cm wide, deeply palmately 3- to 5-divided, the divisions mostly 3-cleft, the ultimate segments 10-30 (35) mm wide, toothed and incised on the upper 1/3 to 1/2, tips pointed, lightly fine-hairy; stalks 8-22 (37) cm long.
Inflorescence a solitary terminal flower or a few-flowered cyme; primary involucral bracts 3, subtending a long-stalked flower, leaf-like, similar to basal leaves but unstalked and broadly triangular in outline; secondary involucres, sometimes present in vigorous plants, of 2 smaller leaf-like bracts; petals absent; sepals usually 5, petal-like, white, egg-shaped, 10-20 mm long, 5-15 mm wide, smooth or hairy near the base; stamens 80-100.
Achenes, many in a spherical to egg-shaped head on stalk 7.5-11.5 cm long, the achenes egg-shaped to ellipsoid, 3-6 mm long, 3.5-6 mm wide, winged, short appressed-hairy to almost smooth, abruptly beaked, beaks 2-6 mm long, not feathery.
Source: The Illustrated Flora of British Columbia