Alias: Gui Zhi, Bai Su, Su Chi, etc. Millet in Labiatae. It has a special fragrance, and the leaves are mostly wrinkled and curled. After complete flattening, it is oval, with a length of 4- 1 1cm and a width of 2.5-9cm. The apex is long or acute, the base is round or wide wedge-shaped, the edge is serrated, both sides are purple or green, and there are many concave glandular scales on the lower surface. The petiole is 2-5 cm long, purple or purple-green, and brittle. The shoots are purple-green, the pith is in the middle, and the fragrance is slightly pungent.