Irritant potential of 3 cacti, Opuntia dilenii, Rhispalis baccifera and Cereus Peruvians, and 4 succulents, Euphorbia royleana, Euphorbia antiquorum,Sansevieria zeyilanica and Agave sisalana was tested by rubbing their freshly exposed pulp 10 times on the forearm skin of 10 human voluntrees. Opuntia