Annuals, 10-50(-150+) cm (some-times branched from bases). Leaf blades: bases obscurely, if at all, clasping, faces sparsely hirtellous to villous (at least on margins, hairs multicellular) and stipitate- to sessile-glandular; proximal ovate to spatulate, 20-50+ × 10-20+ mm, mostly 1-2-pinnately lobed (lobes oblong-linear to filiform); distal similar, pinnately lobed or entire (then linear to filiform). Heads in racemiform or paniculiform arrays (on main and lateral stems). Involucres 2.5-3.5 mm. Receptacles 1.5-2 mm diam. Pistillate florets 20-40+; corollas: lengths ± ¹ / 2 styles, laminae 0. Disc florets 2-6. Cypselae pale pinkish tan, 0.6-0.8 mm, glabrous or sparsely strigillose (hairs 0.05-0.1 mm), sometimes glandular near apices; pappi fragile or readily falling, of 9-12(-20) white to tawny bristles in 1 series, 2-3 mm. 2n = 18. Flowering late summer-early fall. Disturbed sites, among igneous rocks; 1300-2100 m; Ariz., N.Mex., Tex.; Mexico.