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

General:
Annual herb from a fibrous root; stems erect, simple or branched above, rough stiff-hairy, 0.4-2 m tall.

Leaves:
Basal leaves lacking; lower leaves opposite, often heart-shaped; middle and upper leaves alternate, stalked, toothed, egg-shaped or wider, rough stiff-hairy.

Flowers:
Heads with ray and disk flowers, terminal; involucres 10-12 mm tall; involucral bracts graduated, egg-shaped to more oblong, with long-pointed tips, stiff-hairy with fringed margins; ray flowers yellow, up to 3 cm long; disk flowers numerous, reddish-purple, rarely yellow; receptacles flat, over 2 cm wide;

Fruits:
Achene compressed, glabrous or obscurely hairy, over 4 mm long; pappus of 2 firm, readily deciduous bristles with enlarged, thin, papery bases.