You posted an erowid link and it talks about different types of mimosa, none of which are mimosa hostilis...

Assuming your supplier knows what they are collecting because they have the requisite knowledge to be a botanical vendor (read: use a reliable vendor), the phenotypical differences between the 400 species make it pretty easy to identify M. Hostilis with repeated accuracy. I would not use a vendor who says, "Purple Bark!!!! It must be MHRB!!" and then turns around and sells it. As you noted, there are more distinctions that exist and can be determined both easily and quickly to distinguish M. Hostilis from its relatives. As to your claims of skatole, that may very well be the case, but where is your proof? I'm not saying it's not there, just that I have not personally come across any material documenting its presence in MHRB. If you have literature documenting its presence, I'd love to see it.

Rove, thats why you need to get from a trustable supplier, and thats why we have a supplier's section. Just as one example, a major seller such as adenium and all its resellers are very trustable (and usually cheap). While theoretically there are several other mimosas in the world, they do not all exist in the same area.

Adenium is located in a part of Brazil that is where mimosa hostilis is originally from, and its the most abundant tree there, valleys full of it. Its ridiculously cheap and the main use for it in those areas is cutting it down for firewood and for using the wood for making fences (so the whole tree gets cut down, what a pity). The rootbark on the other hand can be sustainably harvested without killing the plants, which they are well aware. Thus when it comes from a specific place you know what plant it is, they wouldnt import some more expensive unknown toxic plant when the right one is THE plant they have

However if you get from some random ebay or whatever shop selling 'mimosa', located in a place of which some other species might be abudant, well, who knows? We've seen recently how greedy some sellers can be. Buy from a trustable place and no need to fear

All these plants are botanically significantly different and they do not all live in abundance in all areas.

Also the source says both verrucosa and ophtalmocentra are also called jurema preta. But thats wrong, verrucosa is jurema branca (white) and ophtalmocentra is jurema vermelha or jurema embira (red). Traditional jurema preta is as we know, Mimosa hostilis (or tenuiflora), of which there is no information in that post.

I really would be interested if you have any reliable source showing skatole presence in Mimosa hostilis (or other plants, out of curiosity), so that we may reason chemically about it and find or disprove as a fact if its there, and if it is, what can we do about it

That's exactly what I'm saying. Any reasonably skilled botanist would laugh in your face if you suggested they might mistake these species for each other. And I too am interested in seeing some scientific literature on skatole. I appreciate your concerns Rove, but I'm confused as to where they are coming from/on what grounds they have been formed.

Thats true swim failed swim don't have a proof but swim will try to get one .Swim is thinking about trying to detect skatole in MHRB someday and he will post his findings.

http://vet.sagepub.com/content/44/6/928.full