Leucopsidium humile Bentham, Pl. Hartw., 18. 1839; Aphanostephus arizonicus A. Gray; A. humilis (Bentham) A. Gray

Plants 6–15 cm. Involucres 4.7–7.5 mm. Ray florets 26-–35. Cypselae (1.1–)1.4–1.6 mm; pappi 0 or minutely ciliate rings 0.1–0.2 mm, sometimes nearly smooth. 2n = 8.

Flowering Apr–Jun(–Oct). Sand and gravel bars, limestone soils, Larrea flats, mesquite savannas, roadsides, disturbed sites; 700–1600 m; Ariz., N.Mex., Tex.; Mexico (Chihuahua, Coahuila, Durango, Nuevo León, Tamaulipas, Zacatecas).