1. How , K.C. 1998. A Dictionary of the Families and Genera of Chinese Seed Plants, 2nd ed., 75Beijing: Science Press.
2. Chinese Crude Drugs Co. 1994. Zhongguo Zhongyao Ziyuan Zhiyao, 1271Beijing: Science Press.
3. Xue , Z.W. and
Yu , Y.Q. 1996. Index Flora of Chinese Medicinal Herbs, 754Beijing: People's Health Press.
4. Eremophilane sesquiterpenes from Cacalia roborowskii