Peruvian bark

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Peruvian bark:

see cinchonacinchona
or chinchona
, name for species of the genus Cinchona, evergreen trees of the madder family native to the Andean highlands from Bolivia to Colombia and also to some mountainous regions of Panama and Costa Rica.
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The Peruvian bark tree, also known as the Jesuit tree or the fever tree, is a cinchona (1) of the family Rubiaceae, native to the western forests of the South American Andes.
Peruvian bark was the very first substances proved by
Hahnemann discovered in 1790 the experimental methodology termed provings, the homeopathic pathogenic trial (HPT), on disagreeing with the Scottish Hippocrates, Cullen, on the action of Peruvian bark. Hahnemann's intuitive ingestion of bark elicited symptoms and signs of malaria, the HPT.