Perennials (may flower first year). Leaves ± scattered over proximal ³/4+ of plant height, internodes mostly 30-75+ mm; lobes mostly filiform to linear, sometimes lanceolate, (5-)15-35+ × 0.5-1(-3+) mm. Ray laminae pale yellow (fading to white), 2-4.5(-6+) mm. Disc corollas 3-4.5 mm. Cypselae 2-3(-5) mm; pappi 0, or 0.5-1 mm. 2n = 24. Flowering year round, following rains. Open sites, along streams, rocky canyons; 100-1500 m; Ariz.; Mexico (Chihuahua, Sinaloa, Sonora). E. B. Smith (1989) treated plants of Coreocarpus arizonicus from the flora area and Mexico as var. arizonicus and other plants of the species from Mexico as var. pubescens (B. L. Robinson & Fernald) S. F. Blake.