1、 Leaf difference

The leaves of potherb mustard are basal, in inverted phimosis or oblong oblanceolate shape. The edges of the leaves are not cracked or slightly notched, with irregular serrations or double serrations. The upper and top cauline leaves are small, oblong, entire and wrinkled

The leaves of bitter chrysanthemum are lanceolate, with pinnate deep cleft or big head pinnate deep cleft, full inverted lanceolate, or the basal leaves are not cleft, oval or round

2、 Flower difference

The racemose inflorescences of potherb mustard are terminal, and the flowers are yellow, with a diameter of 7 to 10 cm; Sepals pale yellow, oblong elliptic, erect and expanded; Petals obovate, 8 to 10 mm long and 4 to 5 mm wide

The flower of bitter chrysanthemum is a head like inflorescence, and a few are arranged in close corymbs or racemes at the top of stems and branches, or are solitary at the top of stems and branches. The florets are tongue shaped and yellow