Erigeron oreganus A. Gray

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

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 ).

Erigeron oreganus is a rare North American species of flowering plant in the family Asteraceae, called the gorge fleabane. It has been found only in the Columbia River Gorge along the border between the US states of Washington and Oregon.

Erigeron oreganus is a perennial herb up to 15 centimeters (6 inches) tall, with a large taproot. The plant generally produces 1-4 flower heads per stem, each head with up to 60 white or pink ray florets surrounding numerous yellow disc florets. The species grows in moist, shaded cliffs and ledges.

Erigeron oreganus là một loài thực vật có hoa trong họ Cúc. Loài này được A.Gray mô tả khoa học đầu tiên năm 1883.