中国绣球花科溲疏属小花溲疏组的分类研究(Ⅰ)——研究历史、地理分布、组的特征

Taxonomic studies on Sect. Mesodeutzia ofthe genus Deutzia Thunb. (Hydrangeaceae) in China

对绣球花科的分类地位、亲缘关系作了综述；并对溲疏属小花溲疏组的研究历史、地理分布进行了讨论，给出了组的特征及种的检索表，得出以下结论：①绣球花科（Ｈｙｄｒａｎｇｅａｃｅａｅ）与广义虎耳草科（Ｓａｘｉｆｒａｇａｃｅａｅｓｅｎｓｕｌａｔｏ）的亲缘关系较远，而与山茱萸科、刺莲花科的亲缘关系较近，因此应把绣球花科从广义虎耳草科中移出单独成立一科．②绣球花科由溲疏属（ＤｅｕｔｚｉａＴｈｕｎｂ．）、Ｆｅｎｄｌｅｒａ、绣球花属（Ｈｙｄｒａｎｇｅａ）、黄山梅属（Ｋｉｒｅｎｇｅｓｈｏｍａ）等１７个属组成．③溲疏属与黄山梅属、山梅花属（Ｐｈｉｌａｄｅｌｐｈｕｓ）的亲缘关系最近，与产于北美的Ｆｅｎｄｌｅｒａ，Ｊａｍｅｓｉａ和Ｗｈｉｐｐｌｅａ几个属的亲缘关系也较近．④小花溲疏组包括９种及８变种，从中国东北部向西南部呈连续的地带性分布，其分布中心在我国西南部．

he delimitation of Hydrangeaceae and its possible phylogenetic relationship with other closelyallied families are discussed. A brief introduction to the taxonomic history and geographic distribution of species in Sect. Mesodeutzia of Deutzia in China is also provided. A key to the species is added at the end. The following conclusions can be drawn: ① Hydrangeaceae does not show a closely relation with Saxifragaceae, while it does show high possibilities for a close tie with families as cornaceae and Loasaceae. Thus the Hydrangeaceae should be separated from the former Saxifragaceae sensu lato. ② Hydrangeaceae, as presently defined, is composed of 17 genera e. g. , Deutzia, Fendlera, Hydrangea, Kirengeshoma etc. ③ Character analysis points out that those genera like Deutzia, Fendlera, Jamesia, Whipplea, Kirengeshoma and Philadelphus seem to be a monophyletic group. A particularly strong phylogenetic tie of Deutzia with Kirengeshoma and Philadelphus is suggested. ④ The Sect. Mesodeutzia Schneid. of Deutzia consists of 9 species and 8 varieties. The species distribute continuously from northeast to southwest in China.