"Yama-haze" (Rhus sylvestris) belongs to the Anacardiaceae (the Sumacfamily). It is a semi-tall deciduous tree that is distributed westward from Tokai district of Honshu to Shokoku, Kyushu of Japan, as well as Taiwan, the Korean Peninsula and China. This tree grows in hill forest edges and can reach 5-6 m in height. The leaves are odd-pinnate compound with 5-15 ovate leaflets. It resembles to the Wax tree (Rhus succedanea), though it is defined by the rough hairs on veins and rachis. The yellowish green, conservative flowers bloom from May to June. The fruits are flat and glabrous.