桂枝系常用中药,为樟科(Lauraceae)植物肉桂Cinnamomum cassia Blume的干燥嫩枝。 作者观察并描述了桂枝的生药性状及其横切面、解离组织和生药粉末的显微特征。结果表明,桂枝皮部的组织构造与肉桂相似;但嫩枝存在着表皮,其外被有厚的角质层。木质部有孔纹和具缘纹孔导管,末端壁倾斜,木纤维壁薄且无纹孔,此与中柱鞘纤维和韧皮纤维不同。以上结果为桂枝的生药鉴定提供了依据。 Guizhi is a commonly used traditional Chinese medicine, and is a dried shoot of Cinnamomum cassia Blume from Lauraceae. The authors observed and described the herbal properties of the cassia twig and its microscopic characteristics of cross-sections, dissociated tissues and crude drug powders. The results showed that the tissue structure of the cassia twigs was similar to that of cinnamon; however, there were epidermis on the shoots, and there was a thick cuticle outside. There are holes in the xylem and rimmed ducts. The end wall is inclined. The wood fiber wall is thin and has no pits. This is different from the chin sheath fiber and bast fiber. The above results provide a basis for the identification of cassia herb.