boh trueng pungo or amethyst is one of the eggplant species.
In general all eggplants can be eaten but not eggplant on this one.
Amethyst or trueng pungo in aceh language that his fruit can not be eaten as where other eggplants, if the meal will be fatal can be crazy begi who eat or could be blood out through blood vessels and will result in death.
Leaf
But the eggplant leaf is already recognized by the ancient aceh as a cure for uric diseases, even doctors even recognize the efficacy of the drug from the amethyst leaves.
Differences or how we distinguish between trung pungo (amethyst) and other eggplant, we can see from its fruit, kalo ordinary skin smooth and not thorny.
But if trueng pungo (amethyst) the fruit is small round like a normal eggplant but thorny like a durian fruit that is still small.
If we do not study maybe we do not know it is eggplant.
But that's the real trueng pungo aka eggplant crazy (amethyst).
Regards @jamdin