Olympic Mountain Ragwort

Perennials, 7–15(–20+) cm (rhizomes fibrous-rooted). Herbage (sometimes purplish-tinged) floccose-tomentose, unevenly glabrescent. Stems single or loosely clustered (erect or arching). Leaves mostly cauline; petiolate (petioles about equaling blades); blades lanceolate or oblanceolate to ovate, (2–)4–8+ × 1.5–3 cm, bases tapered, margins denticulate (distal leaves smaller, lanceolate or linear-lanceolate, bractlike). Heads nodding, 1(–2). Calyculi of 4–8 lanceolate to lance-linear bractlets (lengths mostly less than ¹ / 2 phyllaries). Phyllaries usually ± 21, sometimes ± 13, (8–)10–15 mm, tips usually greenish (often sparsely hairy). Ray florets ± 13; corolla laminae ± 15 mm. Cypselae glabrous. 2n = 40.

Senecio websteri Greenman, Bot. Gaz. 53: 511. 1912, not Hooker f. 1846