Corydalis scouleri grows as a perennial herbaceous plant . A thick, fleshy rhizome is formed as a permanent organ from which one or more 50 to 100 centimeters long, upright stems grow. There are only about three leaves on each stem , they are triple pinnate, 10 centimeters long and wide. The leaflets 1 to 8 inches long and 0.5 to 4 inches wide. Overall, the delicate leaves look like fern fronds.
The flowering period extends from mid-April to mid-June. The lateral or terminal, simple racemose or a sparsely branched panicle inflorescence contains up to 15 to 35 2 to 5 mm long stalked flowers. The hermaphrodite flowers are zygomorphic and fourfold. The two sepals are 1 to 2 mm long. The four light to dark pink petals are 20 to 25 mm long. The spur is 14 to 20 mm long. The six stamens form two bundles.
The capsule fruit is egg-shaped with a length of 1 to 1.5 centimeters and a diameter of 0.4 to 0.5 centimeters. The black seeds have a diameter of about 3.5 millimeters and numerous small bumps. The fruits ripen between mid-May and late June.
The chromosome number is 2n = about 130.
Corydalis scouleri is distributed from the northwest of the US state Oregon via the state Washington to the Canadian island Vancouver Island in the province of British Columbia . It inhabits cool, damp and shady forests at altitudes from sea level up to 1100 meters.
- Gerald Bruce Ownbey: Monograph of the north-American species of corydalis in Annals of the Missouri Botanical Garden , Volume 34, No. 3, 1947.
- Description of Corydalis scouleri in the Flora of North America with a link to the distribution map. (engl.)