Definition: The dried bark of the root and stem of various species of Cinchona, a genus of evergreen trees (family Rubiaceae), native of South America but cultivated in various tropic regions. The cultivated bark contains 7–10% of total alkaloids; about 70% is quinine. Cinchona contains more than 20 alkaloids, of which two pairs of isomers are most important: quinine and quinidine, and cinchonidine and cinchonine.
[Cinchona, fr. Countess of Chinch'on]
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