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Wild species of the cherry tree is widely distributed mainly in the Northern hemisphere In the mainstream classification in Europe and North America, cherry trees for ornamental purposes are classified into the genus Prunus which consists of about 400 species. In the mainstream classification in Japan, China, and Russia, on the other hand, ornamental cherry trees are classified into the genus Cerasus, which consists of about 100 species separated from the genus Prunus, and the genus Cerasus does not include Prunus salicina, Prunus persica (Peach), Prunus mume, Prunus grayana, amongst others. In Europe and North America, however, there were not many wild cherry trees with many large flowers suitable for cherry blossom viewing. Many of them were different from the typical cherry tree shapes and flowers for cherry blossom viewing that people today imagine In mainland China, there has been a culture of viewing plum blossoms since ancient times, and there were many wild species of cherry blossoms, but many of them had small flowers, and the distribution area of wild species of cherry blossoms, which bore large flowers suitable for hanami, was often limited to a small area away from people's living areas On the other hand, in Japan, Prunus speciose (Oshima cherry) and Prunus jamasakura (Yamazakura), which bloom large flowers suitable for cherry blossom viewing and tend to become large trees, were distributed in a fairly wide area of the country and close to people's living areas. Therefore, it is considered that the culture of viewing cherry blossoms and the production of cultivars have developed historically in Japan