Its salvinorin A and B, but the only kind of plant ever known to contain any salvinorins is Salvia divinorum. It is an extremely unique chemical that will not find it anywhere else.
Yes thus far, only S. divinorum has been found to contain them. However, there are about 1,000 species of Salvias, so there may well be another one out there that has it too. However, such is yet to be discovered.
There is a site by a scientist in Britain that covers the terpenoid content of several Salvia species, but I have to go look it up.