关键词: 苦丁茶, 大叶冬青, 枸骨, 叶结构, 后含物

Abstract: The leaf structure of Ilex latifolia and I.cornuta is similar to that of I.kudingcha:bifacial leaf,palisade tissues of several layers,collaferal vascular bundle,little vascular bundles with bundle sheathes;the stomata are scattered on lower epidermis,ap-pearing in anomocytic and cyclocytic type;in leaves there are fibers and sclereids.The cells of mesophyll in these species contain tannin,starch,lipid;few cells contain crystal of calcium oxalate,The differences in structure are as follows:main vascular bundles of leaf stalk and leaf blade in I.kudingcha curve like heart-shaped ring,while in I.latifolia and I.cornuta like arc.On leaf margin,in I.cornuta there are big bundles of fibers that lay across the transection of leaf blade,while in other two species,a little fiber only.

Key words: Ilex kudingcha, I.latifolia, I.cornuta, Leaf structure, Ergastic sub-stances