The "Nard" mentioned in Song of Songs 1:12 

I have omitted from the main article a reference to "nard" in Song of Songs 1:12, and where the Aramaic Targum there writes: "...and they worshipped the golden calf, making foul their actions, so that a bad name went forth unto them in the world. Whereas before [that episode] their [good] scent imbued the world, but afterwards, they stank like nard whose smell is very bad." I am at a loss as to what this "nard" might have been. Could it have been our regular spikenard, and does spikenard have a vey bad smell when laid to the hot coals? Any answers?