What is Chuanbei Chuanbei is the dried bulb of Chuanbeimu, Dark Purple Beimu, Gansu Beimu, and Sokosha Beimu. The first three are known as “pine shells” and “green shells” according to their different traits, and the latter is known as “stove shells”. The apex is bluntly rounded or slightly pointed, the bottom is flat and slightly concave, with a gray-brown bulb disk in the center and occasional remnants of fibrous roots. The texture is hard and brittle, the section is white, rich in powder. Slight gas, slightly bitter flavor. Produced in Sichuan, Gansu and other places. The major morphological feature of Songbei is “holding the moon in its bosom”. Characteristics: This herb is conical or nearly spherical, the outer layer of scale leaves 2 petals, size disparity, the large petals embrace the small petals, not embrace the part of the crescent-shaped, habitually known as “embrace the moon in the embrace”; the top is closed. There are cylindrical, slightly pointed heart buds and 1~2 small scale leaves. Chuanbei is the dried bulb of Phellodendron Bidentata, Phellodendron Bidentata Dark, Phellodendron Bidentata Gansu, Phellodendron Bidentata. The first three are habitually called “Songbei” and “Qingbei” according to their different traits, and the latter is habitually called “Furnace Shell”. The apex is bluntly rounded or slightly pointed, the bottom is flat and slightly concave, with a gray-brown bulb disk in the center and occasional remnants of fibrous roots. The texture is hard and brittle, the section is white, rich in powder. Slight gas, slightly bitter flavor.