一、前言桉树系属桃金孃科,在桉树属中,种类颇多.原产于澳洲,是一种热带阔叶树.1897年才移入我国,近年来我国西南诸省,如云南、贵州、广东、广西、四川、福建等省均有种植.桉叶采自桉树之老或嫩叶荫干而得.叶有似樟脑样的香味,新鲜时尤甚,干燥后香味虽有减少, I. INTRODUCTION The eucalyptus family belongs to the myrtaceae family. There are many species in the genus Eucalyptus. It is native to Australia and is a tropical broad-leaved tree. It only moved to China in 1897. In recent years, the southwestern provinces of China, such as Yunnan, Guizhou and Guangdong Guangxi, Sichuan, Fujian, and other provinces are all planted. The leaves are harvested from old trees or shades of green leaves. The leaves have a scent that resembles camphor, especially when fresh, although the aroma after drying is reduced,