Medicinal source:

Eisenberg, D.M., Harris, E.S.J., Littlefield, B.A., Cao, S., Craycroft, J.A., Scholten, R., Bayliss, P., Fu, Y., Wang, W., Qiao, Y., Zhao, Z., Chen, H., Liu, Y., Kaptchuk, T., Hahn, W.C., Wang, X., Roberts, T., Shamu, C.E. & Clardy, J. (2011). Developing a Library of Authenticated Traditional Chinese Medicinal (TCM) Plants for Systematic Biological Evaluation - Rationale, Methods and Preliminary Results from a Sino-American Collaboration. Fitoterapia. 82: 17-33. [MPNS is grateful to Patricia van Eijndthoven for providing the data from this reference.]