1、 Morphological discrimination

Its plant height is about 35 to 100 cm. There is no distribution of small hairs on it. The stem is usually purplish red, with a diameter of about 1 to 1.5 cm. The rhizome is thick, with a diameter of about 1 to 2.5 cm. The outside color is brown

2、 Leaf discrimination

Its leaves are rectangular, round, oval or obovate lanceolate, with a length of about 7 to 15 cm and a width of about 2.5 to 5 cm. The petiole is obvious, about 2 to 6 cm long, with purplish red on it

3、 Flower discrimination

Its outer perianth is green, the lower pedicel is about 5 to 16 cm long, and the anther inside looks relatively short, about 5 to 8 mm long. The flowering period is from April to July