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Annual or biennial herb from a fibrous root; stems erect, glabrous, branched, 0.3-1.2 m tall.
Lower stem leaves opposite, pinnately cut or bipinnately cut, the ultimate segments linear or linear-elliptic, 5-16 cm long, including the stalk; the upper leaves pinnately divided into 3-5 linear segments or entire.
Heads with ray and disk flowers, several to numerous on long, slender stalks at the end of the branches; involucres 6-10 mm tall; involucral bracts markedly different, the inner 6-8 mm long, egg-shaped, brown with yellow margins, the outer reduced, 7-8, narrowly triangular, obtuse, 2-3 mm long; ray flowers orange-yellow, often with a purplish-brown basal spot, about 8, 1-2 cm long; disk flowers purplish-brown; receptacular bracts linear-oblong, orange-red.
Achenes black, 2-3 mm long, margins narrowly-winged; pappus lacking or of 2 small teeth.
Source: The Illustrated Flora of British Columbia