Distribution: Occurring east of the Cascades crest in Washington; central British Columbia to California, east to the Atlantic Coast.
Habitat: Desert plains and foothills.
Growth Duration: Annual
Conservation Status: Not of concern
Annuals, generally bearing scapes; stems few, 0.3-1.2 dm, unbranched, varying levels of pubescence near base with 2-3-rayed trichomes, occasionally with simple or spurred trichomes, distal portions usually glabrous, seldom with sparse trichomes.
Basal leaves not in rosettes, petioles not clearly defined, blades nearly round to elliptic or narrower toward base, 0.5-2.3 cm long and 1.5-8 mm broad, margins entire, pubescence above and beneath; upper surface trichomes stalked, 2-4-rayed, 0.1-0.5 mm; lower surface trichomes simple, to 0.6-1 mm, with stalked, 2-rayed trichomes, 0.7 mm; cauline leaves generally absent, occasionally 1-3, sessile, blade nearly same as basal.
Inflorescence racemose, usually 5-12 flowered, ebracteate, no elongation in fruit; rachis rigid, generally glabrous rarely minutely pubescent; fruiting pedicels spreading to horizontally or ascending, straight, 2-7 mm, generally glabrous; sepals 4, oblong, 1.5-2.3 mm, pubescent with simple trichomes; petals 4 or rarely absent, white, narrower towards base, 2-4.5 mm long and 1-1.5 mm broad; anthers 0.4-0.5 mm, ovate.
Siliques 7-16 mm long and 1.2-2.3 mm broad, generally linear, plane, flattened; valves glabrous or pubescent with simple or antrorse trichomes, sometimes with less spurred or 2-rayed trichomes; ovaries containing 32-88 ovules; seeds oblong or ovoid, 0.5-0.8 mm long and 0.3-0.5 mm broad.