Mimosa hostilis is the same as Mimosa tenuiflora.
They have white flowers
The thing is, it seems that many vendors have been selling Mimosa verrucosa instead, which has a different colour of flower (yellow I think?).
Entropymancer (where is he?) covered this beautifully in his Jungle Spice information article, in the chapter "Botanical Confustication"
by the way, Mimosa ophthalmocentra, which was also mentioned, is a completely different tree. It doesnt have thorns like the hostilis. There is a published paper about it having 1,6% DMT if im not mistaken, I can even try to find it if someone is interested (or do a search, im sure it comes up). I have some seeds of both ophthalmocentra and hostilis from a friend that lives there in the mimosa birthplace..
I only tried growing them once, just put it straight in some rich earth and sprayed some water regularly, but NONE came out, and I must have tried like 30 seeds... I gotta change my approach. Any suggestions? These mimosas are from very dry areas, and are in general very tough plants that resist living till the end. Maybe I over-watered ? but then again, I guess seeds do need this initial wetness in general, right?