Small upturned pods is believed to be how all chinense varieties started. So the wild brazil or cumari do para is closer to a true chinense than most other chinenses...not the other way around. The comparison with them and frutescense is a good one however and may be valid. Seems as though they both may have evolved from a common source. After reading many articles on it, I also believe the two are one and the same. The subtle differences in plants and pods folks have are more than likely due to different seed sources and the fact that almost everything we grow has just a little "mutt" in it.
Here is an interesting article on it...
http://www.wildchill...-chinense-tepin
Edit:
So then I suppose FayahBen's pic looks more like a c. chinense plant and pods than anyone else' ...
Yeah, I've read a theory that places C. frutescens as their ancestor. That might explain why the bhut jolokia has C. frutescens genes. Or maybe it crossed with its ancestor at some point. The wild Brazil could be a cross. I think the leaves are really different than C. chinese. Maybe it's a mix. I also don't think C. chinese is a wild species. Of course species can go wild. The wild Brazil is very peculiar and interesting though.
Edit: Thanks for the article! I'll read it after Easter (starting mine early). Happy Easter all!