Characteristic basal leaf about twice as long as wide, pinnately lobed, lobes and sinuses rounded.
Plant "Generally recognized by its large, deeply 3–5-lobed proximal leaves with rounded sinuses and lobes, winged petioles, attenuate involucres, sparsely setose phyllaries [involucral bracts], and yellow corollas. The leaves are variable in size and lobing, often on the same plant."--Flora of North America