Guizhi, the name of Chinese medicine. It belongs to the order of Cinnamomum, the middle large tree of Lauraceae; the annual branches are cylindrical, the top bud bud scales are wide oval, the green leaves are alternate, oblong to nearly lanceolate; the flowers are white, about 4.5mm in length; the fruit is elliptical, when mature Dark purple, glabrous; flowering period from June to August, fruit period from October to December. Mainly produced in Guangxi, Guangdong and Yunnan. Cut the twigs in spring and summer, dry them in the sun or in the shade, and cut them into thin slices or small pieces for use.