国产木兰科含笑亚族植物的叶结构及其分类学意义

为了探讨含笑亚族Micheliinae植物属间关系以及含笑属Michella属下等级的划分和一些种的分类学地位，利用放大镜和体视镜对国产含笑亚族植物3属共28个分类群的叶结构特征进行了观察与研究。结果表明：含笑属、合果木属Paramichelia和观光木属Tsoongiodendron植物的脉序类型、一级脉、二级脉及其间脉和三级脉等特征表现出较高的一致性，三属间无明显的划分界限；但是，盲脉及其分支、网眼的发育和大小、叶缘末级脉等叶结构特征存在种间差异。在含笑属中，树状盲脉首次被观察到。用UPGMA对所研究28个分类群、木兰属Magnolia两个亚属各2种和鹅掌楸Liriodendron chinense的叶结构特征和形态学特征共46个性状进行聚类分析。分析结果表明：（1）合果木Pbaillonii和观光木T.odorum与含笑属的种聚为一支，因此，支持将合果木属和观光木属归并入含笑属；（2）这些特征为含笑属内组的划分提供了分类学意义；（3）基于叶结构特征、形态学特征、地理分布、聚类分析，对含笑属内一些种类的分类地位进行了讨论。

Leaf architecture of subtribe Micheliinae (Magnoliaceae) from China and its taxonomic significance

Leaf architectural and morphological characters of 28 taxa from Michelia, Paramichelia and Tsoongiodendron (Magnoliaceae sensu stricto, subtribe Micheliinae) were examined to gain a better understanding of the intergeneric relationships and the systematic positions of some species within Michelia. The taxa examined, all of which have simple leaves with entire margins and camptodromous pinnate venation, varied in their secondary venation, which was brochidodromous or brochidodromous to eucamptodromous, the mixture of simple and composite intersecondary veins, percurrent to reticulate tertiary veins. Dendroid veinlets were recorded for the first time in Michelia species. Phenetic analyses of leaf architectural characters and morphological characters suggested that Paramichelia and Tsoongiodendron are grouped together and merged in the Michelia, and these characters provide useful taxonomic information for division of sections in Michelia. In addition, systematic positions of some species in Michelia are discussed.