Distribution: In the Olympics, Cascades, and Blue mountains of Washington; British Columbia south to Oregon.
Habitat: Open ridges and rock crevices, moderate to high elevations in the mountains.
Conservation Status: Not of concern
Herbaceous perennial, grayish with fine, appressed, aligned hairs, usually with several stems 1-2.5 dm. tall from a branched crown.
Basal leaves numerous in a rosette, linear-oblanceolate to oblanceolate, 2.5-6 cm. long and 1.5-8 mm. wide, entire to deeply wavy-dentate; cauline leaves alternate, several, variable, reduced or larger than the basal, usually deeply wavy-dentate.
Flowers rather showy, in crowded, bractless racemes; pedicles slender, 3-10 mm. long, somewhat ascending; sepals 4, erect, the outer pair somewhat saccate at the base; petals 4, lemon yellow, the claw 10-15 mm. long, the blade obovate, 5-9 mm. long; stamens 6; style beaklike, 2-3.5 mm. long, stigma bi-lobed.
Siliques ascending to erect, flattened, lumpy, 3-12 cm. long and 2-2.5 mm. wide, the valves strongly nerved; seeds in 1 series, wingless.