Biennials or perennials, (± fleshy), 15-250 cm; stout taproots and a fascicle of fleshy lateral roots, often perennating by root sprouts. Stems 1-several, usually erect, often stout, glabrous to densely tomentose; branches 0-many, spreading to ascending, short, stout. Leaves: blades linear to oblanceolate or oblong-elliptic, 10-40 × 2-10 cm, unlobed and spiny-dentate to deeply pinnatifid, lobes spiny-dentate or coarsely lobed, main spines stout, 5-30 mm, abaxial faces subglabrous to loosely tomentose, adaxial glabrous to ± densely villous with septate trichomes; basal present at flowering, spiny winged-petiolate, bases often tapered; principal cauline sessile, well distributed, often not much reduced distally, bases often ± auriculate-clasping; distal cauline often spinier than the proximal. Heads 1-20 in subcapitate to corymbiform arrays (each closely subtended by an involucre-like ring of spiny-margined bracts). Peduncles 0-5 cm. Involucres hemispheric to campanulate, 3-5 × 3-8 cm. Phyllaries in 5-9 series, subequal to imbricate, light green to stramineous, lanceolate to linear, distally often with reddish margins, abaxial faces without glutinous ridge, often ± thinly tomentose, often scabridulous in submarginal bands; outer and middle appressed-ascending, bodies usually reddish-tinged, margins setulose-ciliolate, apices acuminate, spines 1-2 mm, weak; apices of inner straight, flat. Corollas white to yellow, pink, purple, or red, 30-47 mm, tubes 11-30 mm, throats 6-10 mm, lobes 7-10 mm; style tips 3-5 mm. Cypselae straw-colored to tan, 4-6 mm, apical collars weakly differentiated; pappi 25-35 mm. 2n = 32, 33, 34, 35. Although several variants have been given taxonomic recognition as species, these seem at most races. Flower color varies greatly, sometimes within populations and sometimes on a populational or regional basis. Herbarium specimens are sometimes difficult to assign to variety.