Columbia River goldenrod

Haplopappus hallii A. Gray, Proc. Amer. Acad. Arts 8: 389. 1872 (as Aplopappus); Hesperodoria hallii (A. Gray) Greene

Leaf blades (largest) 2–5 cm. Heads 5–15+. Ray corollas 6–10 mm, laminae 6–7 × 2 mm. Disc corollas 6–7 mm. Cypselae 4–5 mm.

Flowering Aug–Oct. Bluffs, benches, crevices, dry, open to lightly wooded slopes; 50–1200 m; Oreg., Wash.

Columbiadoria hallii is known from the vicinity of the eastern Columbia River Gorge. It occurs also "at scattered stations [south] in the Cascades to the Calapooia Mountains," where the plants "are not precisely like the others, and may prove to be varietally distinct" (A. Cronquist 1955, p. 216).