1、 Shape difference

Blue breaking is a biennial herb, about 30-60 cm high, all glabrous, and the root block epidermis is green, oblate or round. The maximum length of the vine is up to 100 cm, the outer skin is white or yellow, the lower part is hairy, and the upper part is hairless

2、 Blade difference

Blue breaking basal leaves are broadly ovate to oblong in shape, about 13.5-20 cm long, with 1 lobe on both sides of the base and serrated edges. Cauline leaves are oblong to linear oblong. The shape of the basal leaf of the vine is a large head feather crack, which is wider than the former and about 20-34 cm long. The middle and upper stem leaves are oblong lanceolate