The origin of the naming itself is strong bitterness on branches, leaves, bark, etc. This somewhat unique deciduous tree is dotted with villages in Satoyama. It is a species that has a wide spread from the Asian continent to all over Japan.＊A dioecious strain. 4 to 8 cm in a pair of feathers of paired leaves＊Small leafAt first glance, it looks like a hazelnut, but it can be distinguished because it has a sawtooth.

A large number of small yellow-green flowers are attached to the inflorescences of 5 to 10 cm from the axilla of this year's branch in early summer. The fruits ripen slightly black around September. The popular mountain of Munakata, Shiroyama, the summit of Mt. Flowering season April-May

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