there is, its defiantly a hybrid, mine looked more like a Habanero than a Bhut,the plant was purple and the pepper had a purple "phase" but they turned red in the end, i dont think im going to grow it again, it sure wasn't what i expected it to be, it should not be confused with PURPLE NAGA JOLOKIA which is an annum and looks like a skinny cayenne, i know this because i grew both this last season, didn't like either one
thanks your friend Joe