Leaf blades 2-10 cm × 5-35+ mm. Involucres 9-12+ × 12-25+ mm. Ray corolla laminae 6-16 mm. Disc corollas 3-6(-7) mm. Cypselae (1-)3-5(-8) mm; pappi 0.6-3+ mm. 2n = 24, 48, 60, 72. Flowering May-Jul. Seleniferous clays, shaley slopes; 1100-2200 m; Ariz., Colo., Mont., N.Mex., Utah, Wyo. Specimens of Platyschkuhria integrifolia with stems leafy over ³/4+ of their lengths have been called var. oblongifolia (mostly from 'four-corners' area of Arizona, Colorado, New Mexico, and Utah). Those with leaves mostly on proximal ¹/10-³/4 their stem lengths, peduncles little or not at all stipitate-glandular, and phyllary tips ± caudate have been called var. ourolepis (mostly from Uinta Basin, Utah). Those with leaves mostly on proximal ¹/10-³/4 their stem lengths, leaf blades widest beyond their middles and rounded at tips, peduncles ± stipitate-glandular, and phyllary tips acute to acuminate have been called var. nudicaulis (mostly from Montana and Wyoming). Those with leaves mostly on proximal ¹/10-³/4 their stem lengths, leaf blades widest proximal to their middles and acute at tips, peduncles ± stipitate-glandular, and phyllary tips obtuse to acute or acuminate have been called var. desertorum (mostly from western Colorado and eastern Utah).