Quillaja saponaria, the soap bark tree or soapbark, is an evergreen tree in the family Quillajaceae, native to warm temperate central Chile. In Chile it occurs from 32 to 40° South Latitude approximately. Populations are found even 2000 m (6500 ft) above sea level. It can grow to 15–20 m (50–65 ft) in height. The tree has thick, dark bark, smooth, leathery, shiny, oval evergreen leaves 3–5 cm long, white flowers 15 mm diameter borne in dense corymbs, and a dry fruit with five follicles each containing 10-20 seeds.