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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. Quillaja saponaria can grow to 15-20m (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.
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