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玉兰属的研究

Notes on Yulania Spach

  • 摘要: 介绍了玉兰属Yulania Spach分类简史,分析了玉兰属与木兰属Magnolia L.的主要分类性状及其区别,阐述了药室纵裂方向、开花时期、花蕾顶生与腋生等性状的演化关系,提出玉兰属与木兰属是趋同演化的两个分类群,花先叶开放等性状是玉兰属的重要标志,中国暖温带是该属树种的起源中心、分布中心和多样性中心等新观点。确立玉兰属的系统位置,对解决现有木兰属乃至木兰科分类系统的争论具有重要的意义。

     

    Abstract: In this paper, author introduces the history of classification of Yulania Spach, compares the difference between Yulania and Magnolia, dissertates the evolution of powder chamber dehisce on side→extrorse or introrse, flower after leaves→flower before leaves and flower bud acrogenous→axillary→cyme, and presents some new opinions such as that Yulania and Magnolia are two converged genera, flower before leaves is the sign of Yulania, and the origin, distribution and diversity center of Yulania is China. To affirm the genus Yulania can effectively settle the disputed of the system of Magnolia L. and Magnoliaceae.

     

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