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Rosy Periwinkle (Vinca rosea) against childhood leukemia.The use of Taxol (Paclitaxel), derived from the bark from Pacific Yew tree against several types of cancer. The Papaya (Carica papaya) that helps to shrink or dissolve ruptured disks in the spine. Pilocarpine (from the Pilocarpus shrub in the Amazon rainforest) and Arecoline from the Betelnut (Areca catechu) to treat glaucoma. Capsaicin from Cayenne pepper (Capsicum fruticosum), to treat the pain of arthritis, shingles and nerves. Quinine, used as a cure for malaria, is extracted from the bark of the cinchona tree. Curare (from which d-turbocuarine is isolated) and that is used as a general anesthesia and to treat muscular disorders. The cancer treatment drug Topotecan is extracted from Camptotheca (Happy tree).