Perennials, 5-15 cm; stoutly taprooted, caudices usually simple. Stems decumbent to basally ascending or erect, moderately villous, stipitate-glandular. Leaves basal (persistent) and cauline; basal blades (1-nerved or weakly 3-nerved) obovate to spatulate, mostly 20-60(-100) × 5-15(-25) mm, margins usually coarsely dentate or incised, sometimes shallowly serrate, faces sparsely to moderately villous, stipitate-glandular; cauline gradually or little reduced distally (bases not clasping). Heads 1(-4) (on branches from proximal axils). Involucres 5-7 × 9-13 mm. Phyllaries in 2-3 series, moderately villous, minutely stipitate-glandular. Ray florets 30-60; corollas white to pink, 5-8 mm, laminae not coiling or reflexing. Disc corollas 3.4-4.7 mm. Cypselae flattened, 1.2-1.4 mm, 2-nerved, faces sparsely strigose; pappi: outer of setae, inner of 15-20 bristles (weakly barbellate and curled and twisted to at least distal ¹ / 2 ).

Flowering May-Sep. Moist shady cliffs and ledges; 20-400 m; Oreg., Wash.

Erigeron oreganus grows in the Columbia River Gorge, primarily on the north side.