The most valuable species, called C. Calisaya, is found in the forests of Caravaya in south Peru and in those of Bolivia.
Forest Products.-The forest and other natural products include rubber, cinchona bark, ivory-nuts, mocora and toquilla fibre for the manufacture of hats, hammocks, &c., cabaya fibre for shoes and cordage, vegetable wool (Bombax ceiba), sarsaparilla, vanilla, cochineal, cabinet woods, fruit, resins, &c. The original source of the Peruvian bark of commerce, the Cinchona calisaya, is completely exhausted, and the " red bark " derived from C. succirubra, is now the principal source of supply from Ecuador.
Quina or calisaya is a natural product of the eastern Andes, and is found at an altitude of 3000 to 9000 ft.
The calisaya trees of Bolivia rank among the best, and their bark forms an important item in her foreign trade.
For this reason those barks which, like C. Calisaya, C. officinalis, and C. Ledgeriana, contain but little colouring matter are preferred, the quinine being more easily extracted from them in a colourless form.