Cinchona is a genus of about 25 species from the Rubiaceae family of tropical South America. Members of this genus are large shrubs or small evergreen trees that grow to a height of 5-15 meters.
The bark of the tree is a source of a wide variety of alkaloids, the best known of which is quinine, an antipyretic (fever-reducing) compound primarily used in the treatment of malaria. Of the many quinine producers, only C. officinalis and C. pubescens (syn. C. succirubra) are cultivated in plantations. C. officinalis subsp. ledgeriana which is used as a rootstock. Both types are known in trade as quinine plants.