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

摘要： 大叶冬青、枸骨叶的结构与苦丁茶基本相似:背腹叶;栅栏组织数层;外韧维管束;小维管束具维管束鞘;气孔仅分布于下表皮,有无规则型和轮列型两种;叶内有纤维、石细胞。叶内都含有单宁、淀粉、脂类及少量草酸钙结晶。叶结构主要区别在于苦丁茶叶主脉维管束成心形的环,另两种呈弧形;枸骨叶缘有横跨叶断面的大纤维束,而另两种叶缘仅少量纤维。

关键词: 苦丁茶, 大叶冬青, 枸骨, 叶结构, 后含物