Fuller et al., 1986. University of California Press, 433p. Document reference Fuller, T. C. ; McClintock, E. M., 1986. Poisonous plants of California. University of California Press, 433p.Web http://books.google.fr/books?id=0-op0XwlDmQCCitation key Fuller et al., 1986Datasheets Russian comfrey (Symphytum × uplandicum)
