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Annual herb from a fibrous root; stems erect, branched, sparsely spreading-hairy to glabrous, 0.2-1.2 m tall.
Basal leaves lacking; stem leaves pinnately compound with 3-5 lanceolate, stalked, opposite, saw-toothed leaflets up to 2-10 cm long and 0.5-3 cm wide, sometimes sparsely short-hairy below.
Heads with ray and disk flowers, sometimes discoid, bell-shaped to hemishperic, few to many in an open inflorescence; involucres 8-12 mm wide; involucral bracts in 2 dissimilar series, the outer ones 5-8, green, leafy, unequal, erect to ascending, linear-lanceolate, longer than the disk, 0.5-2 (rarely 6) cm long, the inner ones erect, oblong, mostly 5-9 mm long; ray flowers 1-5 or sometimes lacking, yellow, 8-12 mm long, shorter than the involucral bracts; disk flowers orange, about 2 mm long.
Achenes 5-10 mm long, dark brown or blackish, narrowly wedge-shaped, compressed, strongly nerved on each face; pappus of 2 retrorsely or antrorsely barbed awns, 3-4.5 mm long.
Source: The Illustrated Flora of British Columbia