Hedge Mustard

This is an introduced annual plant about 1.5' to 3.5' tall that branches occasionally to abundantly. Initially, it forms a low rosette of basal leaves; this is followed by flowering stalks with alternate leaves. The stems are light green to purplish green, and usually glaucous; there are scattered white hairs along the lower stem(s), while the upper stems are hairless. The basal and lower alternate leaves are up to 8" long and 2" across; they are pinnatifid with several pairs of narrow lobes. The upper leaves are up to 4" long and 1½\" across; they are divided into 3 lobes (a terminal lobe and 2 lateral ones) or lanceolate-ovate in shape.