"Oo-kameno-ki" (Viburnum furcatum) belongs to Caprifoliaceae (the Honeysuckle family). It is a small deciduous tree that is distributed throughout Japan, the Sakhalin, the South Kuril Islands and Jeju-do (southern Korea). This tree grows in montane to subalpine zone and can reach 2-5 m in height. The leaves are alternate and round-cordate with toothed edges. The veins are hollow and the surface is wrinkled. The white flowers come in the terminal corymbs from May to June. It is also known in Japan as "mushikari" (insect-eating) because the leaves are often eaten by insects.