Biennials, 60-100 cm. Leaves: basal 2-pinnate, 6-16 cm, lobes 6-20 × 1(-3) mm; cauline 10-40. Heads 20-40 per stem. Peduncles 1-6 cm. Phyllaries yellowish, 5-8 × 3-5 mm. Ray florets 8; corollas white, laminae (6-)14-16 mm. Disc florets 32-50+; corollas yellowish, 3-3.5 mm, tubes 1.5 mm, throats campanulate, 1.5-2 mm, lengths 2-3 times lobes. Cypselae 4 mm, glabrous; pappi 0 or of scales 0.1-0.2 mm. 2n = 34. Flowering Jul-Oct. Limestone soils; 2000-3000 m; N.Mex., Tex.