"Taiwan-yama-tsutsuji" (Rhododendron simsii) belongs to the Ericaceae (the Azalea family). It is a small evergreen tree that is native to the Ryukyu Islands of Japan, as well as Taiwan and central-southern China. This tree grows on montain ridges and slopes, and it can reach 1-2 m in height. The spring foliages are elliptic or narrow elliptic with short acute tips, and the summer foliages are somewhat leathery, obovate-elliptic or oblong. The vermillion or magenta flowers bloom at the terminal branches from March to May. The coralla has darker mottles on the inside of upper part. It has usually 9-10 stemens.