柃属植物叶宏观结构及其分类学意义

为了探讨柃属植物属下等级的系统演化路线及一些种的具体分类学地位，采用脉络法对国产柃属植物34种1变种进行了叶宏观结构比较研究，结果显示柃属植物脉序类型皆为环节曲行羽状脉，一级脉表现为较高的一致性，二级脉与一级脉的夹角为锐角或近直角,二级间脉为简单型或复合型，三级脉多为结网型,叶缘末级脉序结环或不完全，网眼的形状和大小不规则，发育不完全或不完善；这些特征存在种间差异,可用于类群的比较和鉴别。研究同时采用UPGMA法对所选16个叶宏观结构性状进行聚类分析，根据系统树的5个分支，讨论了柃属植物叶的基本演化路线。研究证明叶宏观结构特征对本属植物分类及系统演化关系具有重要意义。

Leaf Architecture of Eurya and its Taxonomic Significance

Leaf architectural characteristics of 35 taxa from Eurya were examined to discuss the evolution route and the systematic positions of some species within Eurya.The result shows:Venations of leaf in genus Eurya are all brochidodromous and camptodromus,there are little differences among the primary veins,the secondary veins' angle of divergence is acute or nearly right-angle,intersecondary veins are simple or compound;tertiary veins are usually reticulate,the margin ultimate venation are forming into a loop o...