Plants 50-100+ cm (perennating bases ± erect, internodes not winged). Leaves all or mostly opposite (distal sometimes alternate); blades ovate-deltate to lance-elliptic, 3-8(-11) × 1-4(-6) cm, bases subtruncate to cuneate, margins coarsely toothed to subentire, apices acute to attenuate, faces ± hirsutulous to scabrellous. Heads borne singly or 2-6 in loose, corymbiform arrays. Involucres ± hemispheric, 8-10 mm diam. Phyllaries 12-16 in 2 series, ± erect, linear to lance-ovate or lance-linear, 4-7 mm. Ray florets 13; laminae 9-12+ mm. Disc florets 60-100+; corollas yellow. Cypselae dark brown, obovate, 4-5 mm, faces glabrous; pappi 0-0.5 mm. Flowering (Aug-)Sep(-Nov). Rocky slopes, limestone; 1500-2100 m; N.Mex., Tex.; Mexico (Coahuila).
