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In page Cinchona:

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Carl Linnaeus named the genus in 1742, based on a claim that the plant had cured the wife of the Count of Chinchón, a Spanish viceroy in Lima, in the 1630s, though the veracity of this story has been disputed. Linnaeus used the Italian spelling Cinchona, but the name Chinchón (pronounced [tʃinˈtʃon] in Spanish) led to Clements Markham and others proposing a correction of the spelling to Chinchona, and some prefer the pronunciation for the common name of the plant. Traditional medicine uses from South America known as Jesuit's bark and Jesuit's powder have been traced to Cinchona.[citation needed]