The Formosa palm (Arenga engleri) belongs to the Arecaceae (the Palm family). It is an evergreen shrub that is distributed from Amami Oshima in Japan to Okinawa, Taiwan and Southeast Asia. This palm is relative of Sugar palm (Arenga pinnata) and grows in the forests, and the height is about 3-4 m. Around June, yellow flowers like brushes will bloom. The fruit is spherical and colored red, yellow, green, and so on. The Japanese name comes from the fact that the sheath (pseudostem) is covered with black fibers.