Prunus Linn. subgenus Padus (Mill.) A.Gray belongs to the subfamily Amygdaloideae Arn. of Rosaceae, with 26 species in the world and 17 species in China, which mainly are distributed in the northern temperate regions and the Himalayan mountains. Basing on the analyzes of the geographic and floristic distribution of subgenus Padus and the regional differences in climate zones, the results were summarized as follows: (1) From a horizontal distribution perspective, the subgenus Padus was mainly distributed in the subtropical regions of China and the southeastern regions of Qinghai-Xizang Plateau, viz. the area south of latitude 35°N, and the similarity coefficient with those surrounding countries and regions ranges from 0.11 to 0.38. It suggested that the Hengduan Mountains and Eastern Himalayas were the modern distribution and diversity center, while the Central China and the Hengduan Mountains served as the refuge for the subgenus Padus, and the relevant areas played an important role in its flora formation and species evolution. (2) From a vertical distribution perspective, the distribution of the subgenus Padus was suitable for an altitude range of 800-4200 m, with two species concentration zones appearing at elevations of 1200-1600 m and 2400-2800 m, respectively. (3) The subgenus Padus was a part of the East Asian flora, but it contained a few components of the Pan Arctic flora, and its geographical distribution characteristics contribute to the species classification of this group. This study provided a basis for further research on its population evolution and the causes of modern geographical distribution patterns in the subgenus Padus.
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