“ The genus Rhus is a member of the natural order Anacardiaceae and contains about 120 species of trees or shrubs mostly native in the temperature regions of both hemispheres. The leaves are alternate and simple or compound, with few to many entire-margined or serrated leaflets, and terminal or axillary panicles of small flowers with parts in fours or sixes. The species are mostly poisonous, some being especially noxious. Such are Rhus toxicodendron, the North American poison ivy, a shrub climbing on rocks and trees by means of rootlets, and poisonous to the touch. ”