E-Flora BC: Electronic Atlas of the Flora of British Columbia

General:
Perennial herb from a long, slender taproot, glabrous or short-hairy; stems 10-60 cm tall, leafy.

Leaves:
Mostly basal, pinnately compound, much dissected into small, very narrow segments; ultimate segments small, rarely as long as 1 cm.

Flowers:
Inflorescence of compound umbels with up to 15 compact heads; flowers bright yellow, small; involucels well-developed with egg-shaped, toothed bractlets.

Fruits:
Oblong to elliptic, 5-11 mm long, somewhat granular-roughened when young, usually glabrous at maturity, flattened, broadly winged with prominent ribs.