Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, e to Northwest Territories, Alberta Montana, Idaho, Wyoming, and central Nevada.
Habitat: Montane woodland to subalpine ridges.
Growth Duration: Biennial, Perennial
Conservation Status: Not of concern
Annuals or short-lived perennials; base branching or unbranched; stems 0.8-3.2 dm, branching or none, pubescence with primarily 3-5-rayed trichomes, and simple and 2-rayed trichomes.
Basal leaves forming rosettes, petioles negligent and ciliate toward base with simple and 2-rayed trichomes, blades oblanceolate, 1-3.5 cm long and 1.5-7 mm broad, margins dentate or rarely entire, pubescence above and beneath; upper surface trichomes stalked, 3-6-rayed, 0.1-0.5 mm; lower surface trichomes simple, to 0.8 mm, with stalked, 3-5-rayed trichomes, 0.1-0.6 mm; cauline leaves generally 2-5, sessile, blade ovate to lanceolate, margins dentate or entire, pubescence same as basal.
Inflorescence racemose, usually 8-30 flowered, ebracteate, elongated in fruit; rachis rigid, pubescence same as stem; fruiting pedicels spreading to ascending or nearly erect, not appressed to rachis, straight, 4-10 mm, pubescent with 3-5-rayed trichomes and occasionally simple trichomes; sepals 4, ovate, 1.7-2.5 mm, pubescent with simple and stalked trichomes with 2 rays; petals 4, white, narrower towards base, 2.8-3.5 mm long and 0.8-1.2 mm broad; anthers 0.2-0.3 mm, ovate.
Siliques generally 7-12 mm long and 1.5-2.5 mm broad, somewhat lanceolate, plane, flattened; valves pubescent with simple trichomes and 2-4-rayed trichomes; ovaries generally containing 30-52 ovules; seeds oblong, 0.8-1.1 mm long and 0.5-0.6 mm broad, often abruptly pointed.