Stems 2.3-7(-9) dm, moderately to densely hirsute proximally, glabrous distally. Cauline leaves: blade conduplicate distally, margins entire or denticulate, surfaces hirsute. Racemes secund; rachis straight. Fruiting pedicels 3-10 mm, sparsely pubescent or glabrous. Flowers: sepals cream or pale yellow, 5-6 mm, glabrous or sparsely pubescent; petals white (without purple veins), 10-17 mm; adaxial filaments 7-10 mm. Fruits spreading to slightly reflexed, arcuate; valves glabrous or sparsely pubescent. 2n = 28.

Flowering May-Jul. Serpentine or Franciscan formation outcrops; of conservation concern; Calif.

Subspecies sonomensis is known from Sonoma County.