Ma'anar ƙamus na kalmar "oak itacen oak" yana nufin wani nau'in shuka, wanda kuma aka sani da Toxicodendron diversilobum, wanda aka samo asali a yammacin Arewacin Amirka. Wannan tsire-tsire na iya haifar da rashin lafiyar mutane da yawa waɗanda suka yi hulɗa da ita, yana haifar da kurji, ƙaiƙayi, da blisters a fata. Ganyen ganyen shukar yana ɗauke da wani sinadari mai suna Urushiol, wanda ke haifar da rashin lafiyan.