The Peyote (Lophophora williamsii), San Pedro (Trichocereus pachanoi), and the Trichocereus peruvianus cactii all contain mescaline. There are many conflicting reports as to which cactus contains more mescaline than others. (See the San Pedro FAQ for more details on this.) The overall conclusion seems that be that the mescaline content depends greatly on the induvidual cactus, and that all three of the above mentioned cactii are likely to contain about the same amount of mescaline.
It is illegal to posses Peyote, unless you are a member of a Native Indian Religous group. It is legal to posess San Pedro or T. peruvianus; however, it is not legal to consume either of these. (These rules apply to the U.S. only, please mail us if you have more information about laws in other countries.)
Peyote is almost extinct and consequently very hard to find. San Pedro on the other hand, is commonly found in local nurseries. I've found that places that sell cactus don't often label the cactii they sell, so identifying the correct one is an important issue. This is a short description of the cactus, and here is a section that points out some pitfalls.
If you don't want to deal with local nurseries, here is info on how to mail order seeds and whole Cactii.
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