"Tsukubane-gashi" (Quercus sessilifolia) belongs to Fagaceae (the Beech family). It is a tall evergreen tree that is distributed from Miyagi and Toyama prefectures of Honshu west to Shikoku, Kyushu in Japan and Taiwan. It grows along the rivers in the mountains and is about 20 m high. The leaves are broad lanceolate, pointed and have serrations on the top. Around May, the stamens hang down from the bottom of the new branch, and the female inflorescences stand upright. The fruits are ovate-round nuts, and the acorn has 8 to 9 circular layers. In Taiwanese Chinese, "毽子椆".