The "Nana-kamado" (Sorbus commixta) belongs to Rosaceae (the Rose family). It is a tall deciduous tree that is native to Japan, as well as the Korean Peninsula, the southern Kuril Islands and Sakhalin. This tree grows in mountains to sub-alpine zone and can reach 6-10 m in height. The barks of young trees are pale brown with elliptic lenticles, and the barks of mature trees are dark gray and furrowed shallowly. The leaves are impari-pinnate with 4-7 pairs of lanceolate to oblong and acute-tipped leaflets. The white flowers bloom in the terminal compound corymbs from May to July. The fruits are pomes and ripen red in fall. The Japanese name comes from the fact that the material is hard and does not burn easily, and remains unburned even after being burned seven times in a fire.