The leaves of potherb mustard are basic, in the shape of inverted or oblong inverted lanceolate. The edge of the leaves is 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 kuju are lanceolate, with pinnate deep split or large pinnate deep split, full-shaped inverted lanceolate, or basal leaves not split, oval or round.
The inflorescence of potherb mustard is terminal, the flowers are yellow, the diameter is 7 to 10 cm; sepals are light yellow, oblong and oval, the petals are obovate, the length is 8 to 10 mm, the width is 4 to 5 mm.
The flowers of kuju are capitate inflorescences, a few of which are closely arranged in corymbs or racemes at the top of stems or branches or are solitary at the top of stems and branches. The floret is glossy and yellow.
