This document discusses worldwide trade in several medicinal plants, including Diosgenin extracted from yams, Cinchona bark which is a source of quinine, Taxol from yew trees used for cancer treatment, and Digitalis from foxgloves. It notes that worldwide trade in herbal medicines was estimated at $62 billion in 2012, with the US as a major importer. The document provides production and trade statistics for several plant-derived compounds. It also outlines the major trading centers and exporting countries for medicinal plants.