Abstract: On the basis of specimen observations, considering the data of SEM leaf epidermal micromophorl-ogy and cytology, a taxonomic revision on Cotoneaster dcanmeri Schneider was carried out. The results show that: 1. The name of C. dammeri var. radicans Schneider should be reduced to a synonym of C. dammeri Schneider. 2. A new subspecies, C. dammeri ssp. songmingensis C. Y. Wu & Lihua Zhou, is described.

Key words: Rosaceae

摘要： 在有关模式和产地标本研究的基础上，结合叶表皮微形 态和细胞学资料，对矮生?子（Cotoneaster dammeri Schneid.）进行了分类学修订， 结果将C.dammeri Schneid.var.radicans Schneid.（即C.radicans(Schneid er) Klotz）归并作该种的同物异名；并描述了矮生?子的1个新亚种，C.dammeri ssp .songmingensis C.Y.Wu & Lihua Zhou 。

关键词: 蔷薇科, ?子属, 矮生?子, 叶表皮微形态, 细胞学, 分类修订