Cinchona officinalis many-flowered; hypanthium with short coarse hairs; reddish calyx, glabrous or nearly so, with triangular lobes; pink or red corolla, sericeous, the lobes ovate, acute, the corolla tube being about 1 cm. long. Fruit and oblong capsule, 1.5–2 cm. long, almost glabrous. English: quinine, red cinchona, cinchona bark, Jesuit’s bark, loxa bark, Jesuit’s powder, countess powder, Peruvian bark. Spanish: quina, cascarilla, cargua cargua, corteza coja. French: quinquina, écorce du Pérou. "Cinchona officinalis" is a medicinal plant, one of several "Cinchona" species used for the production of quinine, which is an anti-fever agent. It is especially useful in the prevention and treatment
Jesuit's bark long conflict over the good or harm effected by Peruvian Bark". The Spanish Jesuit missionaries in Peru were taught the healing power of the bark by natives, between 1620 and 1630, when a Jesuit at Loxa was indebted to its use for his cure from an attack of malaria ("Loxa Bark"). It was used at the recommendation of the Jesuits in 1630, when the Countess of Chinchon (Cinchon; the derivative is Cinchona, the appellation selected by Carl Linnaeus in 1742; Clements Markham preferred Chinchona), wife of the new viceroy, who had just arrived from Europe, was taken ill with malaria