1.药材鉴别桔梗药材呈圆柱形,下部渐细,略扭曲,有的有分枝,长5~20 cm,直径0.5~2 cm。表面白色或淡黄白色,带皮桔梗表面黄棕色;具纵扭皱沟,并有横长的皮孔样斑痕及支根痕。上部有横纹。有的顶端有较短的根茎(习称“芦头”),其上有数个半月形茎痕(习称“芦碗”)。质脆,断面不平坦,形成层环棕色,皮部类白色(习称“玉栏”),木部淡黄白色(习称“金井”),气微,味微甜后苦。 1. Identification of medicinal Campanulaceae cylindrical cylindrical medicine, the lower part of the taper, slightly twisted, and some branches, length 5 ~ 20 cm, diameter 0.5 ~ 2 cm. Surface white or yellowish white, skin with walnut surface yellow brown brown; wrinkled with longitudinal wrinkles, and horizontal long skin-like scars and branching marks. Upper stripes. Some have a short top of the rhizome (habit called “Reed ”), which has a few half-moon-shaped stem marks (Xi said “bowel ”). Crisp, cross-section is not smooth, the formation of layer ring brown, white skin category (Xi said “jade bar”), wood yellowish white (Xi Jin .