为了探究中国分布的蔷薇科（Rosaceae)李属（Prunus Linn.)桂樱亚属〔subgen. Laurocerasus （Tourn. ex Dub.） Rebd.〕植物的区系地理成分与分布特征，对中国境内桂樱亚属腺叶桂樱组（sect. Phaeostictae）、无腺桂樱组（sect. Laurocerasus）、臀果木组（sect. Mesopygeum）20种植物的分布区类型、地理分区、垂直分布特征、地区（亚地区）物种组成相似性进行了分析，并对中国与周边国家的桂樱亚属种类进行了比较。结果表明：中国桂樱亚属植物的分布区类型有3个分布型和3个分布亚型，其中，中国特有分布型种类最多（13种），热带亚洲（印度—马来西亚）分布型及其亚型种类次之（5种）。从地理分区看，中国桂樱亚属植物主要分布在华南和西南地区，即北纬30°以南区域；岭南山地地区种类最多（13种），北部湾地区，滇、黔、桂地区，华中地区，滇、缅、泰地区种类较多，分别有12、11、10、10种；特有种主要集中在华南及西南地区。从垂直分布特征看，3组植物适宜分布的海拔范围相似，无腺桂樱组较腺叶桂樱组和臀果木组的海拔范围更大。地区（亚地区）物种相似性分析结果表明部分亚地区间的物种相似性系数较高。中国与周边国家均分布有腺叶桂樱组和无腺桂樱组种类，但无共同的臀果木组种类；共有种占周边国家桂樱亚属种数的比例均高于占中国桂樱亚属种数的比例。推测华南及西南地区是臀果木组植物在东亚及东南亚的起源中心，而巴布亚新几内亚是该组植物的分化中心；臀果木组植物由中国亚热带地区经中南半岛向西部巽他区、中部华莱士区扩散迁移，最终在东部新几内亚区分化出丰富的物种。综上所述，中国桂樱亚属3组植物的地理分布特征高度相似，该亚属的分布中心为岭南山地地区至北部湾地区，并向西部、北部和南部扩散，西至西喜马拉雅山区，北至黄淮、江汉平原，南至海南岛等地，特有种集中分布在华南及西南地区。

To investigate the floristic geographical components and distribution characteristics of species in subgen. Laurocerasus （Tourn. ex Dub.） Rebd. in Prunus Linn. of Rosaceae distributed in China, the areal-types, geographical divisions, vertical distribution characteristics, and species composition similarity between regions （subregions） of 20 species in sect. Phaeostictae, sect. Laurocerasus, and sect. Mesopygeum of subgen. Laurocerasus  in China were analyzed, and the species in subgen. Laurocerasus between China and neighboring countries were compared. The results show that there are three areal-types and three subtypes for the areal-types of species in subgen. Laurocerasus  in China, in which, the Chinese endemic areal-type has the most species （13 species）, followed by Trop. Asia （Indo-Malesia） and its subtypes （5 species）. In terms of geographical divisions, the species in subgen. Laurocerasus  in China are mainly distributed in S. China and SW. China regions, namely south regions of 30° north latitude; Lingnan mountain region has the largest number of species （13 species）, while Beibu Gulf region, Yunnan, Guizhou and Guangxi region, Central China region, and Yunnan, Myanmar and Thailand region have relatively large numbers of species, which are 12, 11, 10, and 10 species, respectively; the endemic species are mainly concentrated in S. China and SW. China regions. In terms of vertical distribution characteristics, the altitude ranges suitable for distribution of species in the three sections are similar, and sect. Laurocerasus has a broader altitude range than sect. Phaeostictae and sect. Mesopygeum. The species similarity analysis result between regions （subregions） shows that the species similarity coefficients between some subregions are relatively high. Species in sect. Phaeostictae and sect. Laurocerasus are distributed in China and neighboring countries, but there is no common species in sect. Mesopygeum; the proportion of common species to species number of subgen. Laurocerasus in neighboring countries is higher than that in China. It is speculated that S. China and SW. China regions are the origin centers of sect. Mesopygeum species in East Asia and Southeast Asia, while Papua New Guinea is the differentiation center of species in this section; the sect. Mesopygeum species  migrate and spread from subtropical regions of China through Indo-Chinese Peninsula region to Western Sundaland region  and Wallacea region, and eventually differentiate into abundant species in New Guinea region. In conclusion, the geographical distribution characteristics of species in the three sections of subgen. Laurocerasus in China are highly similar, the distribution center of this subgenus is Lingnan mountain region to Beibu Gulf region, and it spreads westward, northward, and southward, reaching as far west as Western Himalayas, as far north as Huanghuai and Jianghan Plains, and as far south as Hainan Island, and the endemic species are concentratedly distributed in S. China and SW. China regions.