Perennial herb from a taproot; stem solitary, erect, 25-120 cm tall.
Alternate; basal and lower stem leaves palmately 3-5 lobed or divided without a narrow leaf axis, stalked below, becoming sessile above, primary divisions merely lobed or with teeth, blades 3-13 cm long, 2-18 cm wide.
Inflorescence of terminal umbels less than 1 cm wide in flower; flowers yellow or sometimes purplish; involucels inconspicuous, of 5 narrow bractlets.
Subglobose burrs, 2-5 mm long, covered, except sometimes at the base, with stout, hooked prickles.
If more than one illustration is available for a species (e.g., separate illustrations were provided for two subspecies) then links to the separate images will be provided below. Note that individual subspecies or varietal illustrations are not always available.
Illustration Source: The Illustrated Flora of British Columbia