Tithonia argophylla D. C. Eaton in S. Watson, Botany (Fortieth Parallel), 423. 1871

Perennials, 15–80 cm; herbage silvery, hairs fine, ± appressed. Leaves: petioles winged, wings merging with blades; blades rhombic or widely elliptic, 4–10 × 2–8 cm. Peduncles 30–80 cm. Involucres 15–25 mm. Phyllaries in 4–6 series, lanceolate to ovate, apices acuminate. Ray florets 20–35; corollas deep yellow, laminae 12–30 mm (1–1.2 times disc diams.). Cypselae 9–13 × 4–5 mm, hirsute; pappi usually of 2 awns 1–2 mm (plus minute scales or teeth), sometimes 0.

Flowering Apr–May. Stony plains, hillsides; 1000–1500 m; Ariz., Nev.