Leaves 10-20 mm overall, lobes 3-7, subequal. Peduncles 20-50 mm. Calyculi of 3-5 bractlets. Involucres obconic to campanulate, 4.5-6 × 4-5 mm. Phyllaries ca. 13, margins of outer distinct almost to bases, abaxial faces glabrous (margins ciliate). Disc florets 50-70. Pappi usually of 10, 3-aristate scales, sometimes of 5 muticous scales alternating with 5, 3-aristate scales. 2n = 32 (Argentina).

Flowering spring-summer. Sandy or rocky soils of desert washes and fans, commonly with limestone, often ruderal along roadways; 500-2500+ m; Ariz., Calif., Nev., N.Mex., Tex., Utah; Mexico; South America (Argentina).