'Ryukyu-chisha-no-ki' (Ehretia dichotoma) belongs to Boraginaceae (Borage family). It is an evergreen tall tree that is distributed from Yaeyama Islands of Japan to Taiwan, Philippine, Malaysia and Australia. This tree occurs in coastal lowland forests and can reach about 10 m in height. The leaves are ovate-elliptic, entire and alternate. The corymbs are borne on the terminal branchlets and bloom small white flowers from May to June. The corolla is funnel-shape and divided into 5 lobes at the tips, and the lobes are recurving. The fruits are globose and ripen red-brown.