Perennials, (15-)20-60(-100) cm (caudices erect). Herbage arachno-tomentose to sericeous-lanate (especially on abaxial faces of phyllaries), unevenly glabrescent. Stems single (turgid). Leaves evenly distributed (proximal withering before flowering); subsessile or petiolate; blades obovate to oblanceolate, 5-15(-25) × 2-6(-10) cm, bases tapered, margins serrate-dentate to denticulate or subentire (distal leaves slightly smaller). Heads 1-5(-15+) in corymbiform arrays (involucres notably large, 20-40 mm diam.). Calyculi of 6-10 linear bractlets (longest nearly equaling phyllaries). Phyllaries ± 21, 8-15 mm (sometimes purplish or pinkish-tinged), tips greenish. Ray florets usually ± 21, rarely 0; corolla laminae 20-25 mm. Cypselae glabrous. 2n = 40. Flowering summer. Sandy-gravelly ocean shores and upper beaches; 0 m; St. Pierre and Miquelon; B.C., N.B., Nfld. and Labr., N.S., Que.; Alaska, Maine; ne Asia. Rayless individuals of Senecio pseudoarnica have been recognized as var. rollandii or forma rollandii (Victorin) Fernald; they are not otherwise distinctive.