Cinchona is a genus of about 25 species in the family Rubiaceae, native to tropical South America. They are large shrubs or small trees growing to 5–15 metres tall with evergreen foliage. The leaves are opposite, rounded to lanceolate, 10–40 cm long. The flowers are white, pink or red, produced in terminal panicles. The fruit is a small capsule containing numerous seeds. The medicinally active bark, which is stripped from the tree, dried and powdered, includes other alkaloids that a… (More on Cinchona)