Abstract:Changium smyrnioides Wolff, a monotypic species of family Umbellaceae, has a narrow distribution area and can found only in Yangtze River basin in China; the widespread Anthriscus sylvestris (L.) Hoffm can be found from temperate to subtropical zone in Asia, Europe and North America. Both species have fleshy roots, which are prized in Chinese medicine. Because of the land use, C. smyrnioides has now become an endangered species, while A. sylvestris do not endangered. Comparative studies on the ecological st...