Senecio altus Rydberg; S. latus Rydberg; S. lugens Richardson var. hookeri D. C. Eaton

Perenni­als, (30–)40–80 cm (rhizomes stout). Herbage tomentose, unevenly glabrescent. Stems single. Leaves reduced distally; petiolate; blades oblanceolate to elliptic, 4–12× 1–4 cm, bases tapered, margins weakly dentate or denticulate (denticles callous; mid leaves similar, smaller; distal leaves bractlike). Heads (3–)5–24 in corymbiform arrays. Calyculi of 1–5 bractlets (longest 2–3 mm). Phyllaries (± 13) ± 21, 3–7 mm, tips black or brownish. Ray florets ± 13; corolla laminae 6–10 mm. Cypselae usually hairy, sometimes glabrous. 2n = 40.

Flowering spring–early summer. Open meadows, especially in coniferous associations; 1000–1800 m; Idaho, Mont., Nev., Oreg., Utah, Wyo.