Senecio huachucanus A. Gray, Proc. Amer. Acad. Arts 19: 54. 1883

Perennials, 60–100+ cm (rhizomes weakly spreading). Herbage glabrous or sparsely and unevenly floccose or tomentose. Stems single (erect). Leaves evenly distributed; petiolate; blades ovate to lanceolate, (7–)10–20+ × 4–6(–7) cm, bases ± tapered, margins dentate or denticulate (denticles callous; distal leaves smaller, clasping, bractlike). Heads 4–12 in open, cymiform arrays. Calyculi of 5–10 bractlets (0.5–2.5 mm). Phyllaries ± 13, 4–6(–7) mm, tips black. Ray florets ± 8; corolla laminae 5–8 mm. Cypselae glabrous.

Flowering spring–summer. Mountains; of conservation concern; 1800–2200 m; Ariz.; Mexico.

Variety huachucanus is in the Center for Plant Conservation’s National Collection of Endangered Plants.