The upper leaves also clasp the stem, distinguishing this plant from other common mustards. Lower leaves are deeply lobed and may be up to a foot long. Above the upper seed, the pods have a obvious constricted beak. Normally the entire plant is smooth. The plant flowers from May to August.
Seeds germinate in the early spring, summer, or fall.
Seeds may remain viable in the soil for many years. Widespread throughout North America. Found in mint, alfalfa, dry beans, potatoes, sugarbeets, and cultivated vegetable crops. Also found along roadsides and waste areas.