One out of thousand San Pedros cactus (Trichocereus pachanoi) grows into a mutant, I know it's actualy still a San Pedro but it's interresting I think.
Although 'Lophophora diffusa/Lophophora williamsii' contains no mescaline
it has an interresting psychoactive effect, it contains different kinds of
"(tetrahydro) isoquinolines" which are like mescalines in reaction with other
chemicals.
you also have something called "Hoodia Gordinii', it's not really psychoactive
but is used in a lot of products to lose weight.
EDIT: 'Lophophora williamsii' = peyote and offcorse contains mescaline,
but 'Lophophora diffusa doesn't ,though it has a psychoactive effect, it contains different kinds of
"(tetrahydro) isoquinolines" which are
like mescalines in reaction with other
chemicals.