肉桂（Cinnamomumcassia）又称牡桂、玉桂。属樟科常绿乔木。单叶互生，革质，长椭圆形而厚，不具托叶，叶片上有三条很明显的基出脉。夏日枝梢叶腋抽生长花梗，缀生淡黄绿色小花，排列成圆锥花序，花后结紫红色椭圆形的果实。树皮入药，性大热，味辛甘，嫩枝称“桂枝”，亦入 Cinnamon (Cinnamomumcassia), also known as Gui, jade Guangxi. Lauraceae is an evergreen tree. Leaves alternate, leathery, oblong and thick, without stipules, the leaves have three obvious basal veins. Summer branch shoots axillary pumping growth pedicel, yellow-green flowers decorated with flowers, arranged in a panicle, flower knot purple red oval fruit. Bark into the medicine, hot, sweet, tender shoots, “Guizhi”, also into