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"Yama-yanagi" (Salix sieboldiana) belongs to Salicaceae (the Willow family). It is an endemic spices of Japan, distributed from the Kinki district of Honshu west to Shikoku and Kyushu. This tree grows in hills and mountainous areas, and up to a height of 3-4 m. The bark is dark gray. The leaves are oblong and alternate with each other, with corragated serrated edges. It is dioecious, and flowering at the same time as leaves develop, around late March to April. Fruits are capsules, ripen in May and peel off the seeds wrapped in white fluff.
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