Annuals, 20-50 cm. Stems minutely, prominently, often sparsely, papillate-scabrous (hairs triangular or deltate to lanceolate, less than 0.1 mm). Leaves: proximal usually absent at flowering; cauline blades 1-nerved, linear, 0.5-1.2 mm wide, little reduced distally. Heads in loose arrays. Involucres campanulate, 2.5-5 mm diam. Phyllary apices flat. Ray florets 10-15; corollas yellow, 3-5.5 mm. Disc florets 18-37. Cypselae 0.9-1.2(-1.4) mm, faces without oil cavities, densely strigoso-sericeous in rows (hairs appressed to spreading, apices clavate); pappi of 1 series of narrowly triangular or narrowly oblong scales 0.2-1 mm (distinct or basally connate ¹ / 4 - ³ / 4 their lengths, usually shorter in rays). 2n = 8 (10). Flowering (Feb-)May-Dec. Grasslands, roadsides, lake edges, alkaline flats with Atriplex, oak-pine-juniper woodlands, often over gypsum or limestone; (200-)1300-2000 m; Ariz., N.Mex., Tex.; Mexico (Chihuahua, Coahuila, Durango, Nuevo León, San Luis Potosí, Tamaulipas, Zacatecas).