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General:
Glabrous perennial herb from a short, stout rhizomatous stem-base with a cluster of fleshy roots or a taproot, sometimes glaucous; stems solitary, 0.2-1.2 m tall.
Leaves:
Stem leaves egg-shaped to deltoid in outline, 2-4 times pinnately dissected, with lobed or cleft leaflets; leaflet stalks sheathing at base, the blades 15-30 cm long.
Flowers:
Inflorescence of 1 or more compound umbels; flowers white, small, numerous in 8-30 small, compact heads; involucral bracts linear, 1-few or lacking.
Fruits:
Oblong-oval, 5.0-8.5 mm long, glabrous, ribbed, the lateral ribs with broad, thin wings.
Source: The Illustrated Flora of British Columbia
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