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The Silver bell tree (Pterostyrax corymbosus) belongs to the family Styracaceae. It is a semi-tall deciduous tree that is distributed from Kinki region of Honshu westward to Shikoku, Kyushu in Japan, and the southeastern part of China. It grows in deciduous forests along mountain streams, and can reach heights of 5 to 15 m. The bark is grayish brown and corky, and splits lengthwise into shallow fissures. The leaves are broadly elliptic or obovate, 8 to 18 cm long, and have shallow serrations along the edges. From May to June, it produces many white flowers in drooping compound racemes at the tips of the branches. The fruit is an obovate drupe. The Japanese name comes from the stem of the "asa" (hemp), "o-gara" after the bark has been removed. It is also called "小葉白辛樹" (xiao ye bai xin shu) in Chinese.
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