Plants scapose; glabrous or puberulent, trichomes crisped, simple or branched. Stems 0.1-0.5 dm, glabrous or puberulent. Basal leaves thick, leathery; blade oblanceolate to oblong, (0.3-)0.5-1.2(-1.4) cm × (0.5-)1-2(-2.5) mm, margins ciliate, (trichomes simple and forked, to 0.3 mm), apex acute, surfaces glabrous or sparsely puberulent, trichomes simple and stalked, forked or subdendritic, crisped (not setiform); midvein prominent. Cauline leaves absent. Racemes 2-20 -flowered. Fruiting pedicels 2-6(-8) mm, glabrous or puberulent. Flowers: sepals 2.5-4 × 1-1.5 mm; petals white, spatulate, 3.5-6 × 1.5-2 mm, attenuate to clawlike base to 1 mm; filaments 2-3 mm; anthers 0.5-0.6 mm; gynophore 0-0.5 mm. Fruits ovoid to ellipsoid, terete, (2-)3-6(-7) × 2.5-3 mm; valves each with obscure midvein, rounded on back, glabrous or puberulent; style (0.5-)1-2(-2.5) mm. Seeds brown, 2-3 × 1.5-2 mm. Flowering Apr-Aug. Scree, serpentine ridges, red barren hillsides, rocky ridges, loose volcanic hillsides; 1500-2500 m; Calif., Idaho, Nev., Oreg., Utah, Wash.