Distribution: Weedy introduction from central Europe, fairly common in eastern United States; found in a few scattered locations in the Pacific Northwest.
Habitat: Waste areas and disturbed soil.
Flowers: May - July
Origin: Introduced from Eurasia
Conservation Status: Not of concern
Annual with soft hairs retrorsely aligned and appressed, the stems simple to freely branched, 1.5-8 dm. tall.
Leaves alternate, 3-20 cm. long, pinnatifid, the segments often again wavy lobed.
Flowers in a loose, elongate, bracteate raceme, the lowermost flowers sometimes in the axils of scarcely modified leaves; pedicles slender, ascending, under 1 cm. long; sepals 4, slightly saccate at the base; petals 4, pale yellow, 4-7 mm. long; stamens 6; style 1.5-3 mm. long.
Siliques 2-4.5 cm. long and 1.5 mm. thick, terete-quadrangular, the valves prominently keeled; seeds in 1 series.