I have a Vietnamese pepper that sounds somewhat similar. My brother's girlfriend brought them back from Vietnam a couple of years ago and called them Black Dragons. I've googled the hell out of the name and found nothing so I have to assume that they go by another name as well. I don't know if they are the same as yours. They do resemble chile de arbols, but they aren't wrinkled. The plants grow about 4 feet tall and have dark green, almost blackish, leaves that are slightly fuzzy. They do not bush out much. The peppers grow upright and ripen from black to green to red. She also said they were "scathing hot", but they sure don't compare to Nagas, IMO.

That sounds like it to me. The girls said they go from purple to green to red. Totally looking forward to next year. Got a few new varieties and hopefully going to pick up some more.

-HabBob