Breynia vitis-idaea or officinal breynia is a perennial tree-like species of Phyllanthaceae (Euphorbiaceae s.l.), found from India east to Taiwan and Okinawa and south to Indonesia. It is a shrub or treelet with egg-shaped leaves that can reach up to 3 m tall. It has staminate flowers and spherical, red fruit. It contains the saponin breynin and terpenic and phenolic glycosides. It is marketed in Taiwan as Chi R Yun.