Leaves: petioles 1-5+ mm; blades 7-10(-18+) × 1-6(-12) cm overall, lobes 3-5+ mm wide. Peduncles 1-10+ mm. Involucres 2-3+ mm. Phyllaries: outer 5 sparsely strigose or glabrous abaxially, margins ciliolate, inner ciliolate. Pistillate florets: corollas 0.1-0.7 mm, or 0. Functionally staminate florets: corollas 1.5-2 mm. Cypselae 1.5-2 mm. 2n = 72. Flowering Jul-Nov. Calcareous desert soils; 1000-2000 m; Ariz., N.Mex., Tex.; Mexico (Chihuahua, Coahuila, Durango, Nuevo León, San Luis Potosí, Zacatecas).