Stems 50–200 cm. Herbage glabrate, glaucous. Leaf blades ovate, 10–25 cm long, deeply divided into 3 to 5 lobes or serrate leaflets; ultimate segments lanceolate; uppermost leaves ovate to lanceolate. Heads radiate; phyllaries ovate to lanceolate, minutely ciliate, 5–15 mm long; receptacle hemispheric to conic, 10–25 mm high. Rays 8–12; ligules pubescent, 2–4 cm long. Disk corollas yellowish, 4–5 mm long. Achenes 3–5 mm long (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX)
Our plants are variety ampla
(A. Nelson) Cronquist.