General:
Perennial herb from an elongate taproot or a thickened, subterranean root crown or branching stem-base; stems prostrate to ascending, up to 40 cm long, glabrous.

Leaves:
Mostly basal, prostrate, not much dissected, with toothed or cleft leaflets.

Flowers:
Inflorescence of compound umbels; flowers white or yellowish-white; longer spokes up to 1.5-6 cm long at maturity; involucels of a few inconspicuous, narrow bractlets.

Fruits:
Oblong to elliptic, 8-16 mm long; wings thin, equal to or narrower than the body.

Source:  The Illustrated Flora of British Columbia