1. Guo DA (2009) J Nat Med 7:1
2. Wang HH, Shen YG, Lu YX (2010) J Tradit Chin Med Pharm 16:95
3. Ohwi J (1956) Flora of Japan. Shibundo, Tokyo, p 508
4. Institute of Botany of the Chinese Academy of Sciences (1994) The Picture index of senior China plant, vol I. Science Press, Beijing, p 646
5. La Cour B, Molgaard P, Yi Z (1995) J Ethnopharmacol 46:125