Annual or short-lived perennial; caudex simple; stems spreading to prostrate; basal leaves numerous, petiolate, broadly oblanceolate; stem leaves densely overlapping, less than 2 cm long, sessile, linear-oblanceolate; petals bright yellow, 8-10 mm long by about 4 mm wide; fruiting pedicels divaricately ascending, 8-10 mm long, straight or nearly so; silicles ovate to nearly spherical, glabrous, with a stipe less than 1 mm long; styles 2-3 mm long; ovules 6-8 per locule. Flowers in April and early May.