The Japanese red oak (Quercus acuta) belongs to Fagaceae (the Beech family). It is a tall evergreen tree that is distributed westward from Miyagi-Niigata prefecture of Honshu to Shikoku, Kyushu of Japan, Taiwan, the southern Korean Peninsula and China. This tree grows in mountains and can reach about 20 m in height. The barks are greenish gray-black, and fissured when aged. The leaves are oblong, usually entire and arranged into alternate. It is monoecious. The male clusters are drooping on the lower new branches, and the female clusters are erect and borne in the axils from May to June. The fruits are ovate-round nuts and mature in next year's fall. The timber is pale rose-brown, very hard, and used for agricultural implements, equipments or architectures.