Sub-category: Mustard family
Grows to about 30 to 60 cm high, with a maximum of 1 m. The stem is ribbed and hairless, branched at the base. It has a basal rosettes of shiny, dark green leaves. The basal leaves are stalked and lyre-pinnatifid, that is with a large terminal lobe and smaller lower lobes. The cauline leaves are smaller, ovate, toothed, or lobed. The flowers are produced in dense terminal clusters above the foliage. They are 7 to 9 mm long, with four bright yellow petals. The fruit is a pod around 15 to 30 mm.
Found along roadsides, along rivers, on slopes, waste areas, meadows, and in ditches. The flowering period extends from about April through July.