Distribution: In the Cascades Mountains in Washington; British Columbia south to California.
Habitat: Rocky crevices, moraines, ridges and talus slopes in alpine and sup-alpine regions.
Conservation Status: Not of concern
Grayish, mat-forming perennial from a much-branched crown, the simple stems 6-15 cm. tall, the herbage with mixed pubescence u00e2u20acu201c long, soft, and simple, and shorter and freely branched.
Basal leaves 2.5-7 cm. long, ovate or obovate, pinnate or pinnatifid, the segments obovate; petioles slender, at least as long as the blades, pubescent with branched hairs and longer, simple hairs; cauline leaves several, alternate, reduced.
Inflorescence a bractless, flat-topped raceme, becoming elongate in fruit; pedicles ascending; sepals 4, 2.5-3.5 mm. long, persistent; petals 4, spatulate, white or tinged with purple, 5 mm. long; stamens 6; style about 0.5 mm. long, stigma discoid.
Siliques ovate to oblong, 3-6 mm. long and 2-3 mm. broad, glabrous, obcompressed, the valves 1-nerved; seeds in 1 series.