A tran'nuc was a type of tree that was indigenous to Qo'noS. The trees had thick, thorny branches and edible, purple fruits. (TNG novel: Kahless) Some Klingon hunters would use bows made from tran'nuc wood and strung with the guts of a s'tarahk. (ST - New Worlds, New Civilizations short story: "A Warrior's Path")