Plants 50–250 cm (perennating bases ± erect, internodes winged). Leaves all or mostly alternate (proximal usually opposite); blades deltate-ovate or deltate to lanceolate, 4–10(–25+) × 2–6(–15) cm, bases broadly cuneate to ± trun-cate, margins coarsely toothed to subentire, apices obtuse to acute, faces ± hirtellous. Heads 30–80+ in ± paniculiform arrays. Involucres ± hemispheric, 5–7 mm diam. Phyllaries 12–15+ in 2 series, ± erect, spatulate to linear, 2.5–4 mm. Ray florets (9–)10–12+; laminae 4–6 mm. Disc florets 20–25+; corollas ochroleucous or white. Cypselae dark brown to blackish, oblanceolate, 4–5 mm, faces ± hirtellous or glabrous; pappi 1.5–2+ mm. 2n = 34.

Flowering (May–)Jul–Sep(–Dec). Swales, disturbed sites; 10–100 m; Tex.; Mexico (Nuevo León, Tamaulipas).