Abstract: The main taxonomic characters, such as patterns of floral position, number of ovule per carpel and sexuality of flower in many species of subfamily Magnolioideae were observed in both field and cultivat-ed states (Kunming Botanical Garden) . The temiinal flowers were observed in some plants of tribe Michelieae that was thought having only ax-illary flowers before, such as M. yunnensis, M. sphaerantha, M.figo, M. macclurei, M. balansae. The axillary flowers of tribe Michelieae, in fact, occur tenninally on the abnormal short shoots, which arise from the leaf axils and grow abnormally. In contract, the terminal flowers occur on normal shoots. In the period of alabastrum, the flowers of Magnolia denudata and M. soulangiana of tribe Magnolieae occur tenninally on short shoots although they seem like occurring axillaryly. All flowers of subfamily Magnol-ioideae actually occur terminally on shoots at morphogenesis on the basis of our observations.

Key words: Magnolioideae

摘要： 对木兰亚科植物花的着生式样、心皮中的胚珠数目和花的性别等主要分类性状进行了研究。在毛果含笑、云南含笑等含笑属植物中观察到了顶生花。含笑属的聚伞花序不是一个花序，而是一个具有多花的枝条，其“总花梗”实质上是一个枝条，其节上的花顶生于次级侧枝上，属于顶生花式样。山玉兰和盖裂木每心皮中的胚珠数目为2～7个，而不是2个。在山玉兰、黄兰、合果木等植物上观察到了单性雄花，而在云南拟单性木兰的雄株上观察到了少数具有1～8个心皮的两性花。根据观察结果，本文讨论了这3个主要分类性状在木兰亚科分类系统中的意义，并对现有分类系统进行了分析，在此基础上对中国木兰亚科的分类系统做了修订，依据分枝式样、花药的开裂方式，将中国木兰亚科植物归并为木兰属和含笑属。

关键词: 木兰亚科, 花着生式样, 心皮中的胚珠数目, 花的性别, 分类系统