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Perennial herb from a taproot and sometimes elongate stem-base; stems erect, more or less stiff-hairy, 0.3-1.0 m tall.
Basal leaves coarsely toothed; stem leaves oblanceolate, opposite, deeply pinnatifid, with narrow lateral and broader terminal segments, 10-25 cm long, reduced upwards.
Inflorescence of dense, hemispheric heads terminating long naked stalks, 1.5-4 cm wide; corollas lilac or purple, funnel-shaped, 9-12 mm long, 4-lobed, outermost ones largest, glabrous; calyces cuplike, 3-4 mm long, usually with 8 bristlelike teeth; involucral bracts equal, 8-12 mm long; receptacles not scaly, merely hairy.
Achenes, 5-6 mm long, 4-angled, densely hairy.
Source: The Illustrated Flora of British Columbia