An excellent article on the Calabar bean is: Holmstedt, B., The ordeal bean of Old Calabar: the pageant of Physostigma venosum in medicine, in Swain, T., ed., Plants in the Development of Modern Medicine, Harvard University Press, Cambridge, 1972.    From Wordnik.com.  [The Serpent and the Rainbow] Reference

= Calabar Bean or Physostigma.    From Wordnik.com.  [Aids to Forensic Medicine and Toxicology] Reference

Physostigma, 139.    From Wordnik.com.  [Aids to Forensic Medicine and Toxicology] Reference