Wild Mustard: Brassica kaber - The lower stem leaves are obovate in shape with toothed margins and petioles. The beak (upper portion) of the silique is somewhat flattened.

Black Mustard: Brassica nigra - Stem leaves petiolate, not clasping. The blades are lobed, with the terminal lobe larges and one to several pairs of narrow, lateral lobes. The upper leaves are toothed rather than lobed. The siliques are erect, measuring 1-2.5 cm long and 1-1.5 mm wide.