The Pacific poison oak (Rhus diversilobum) belongs to Anacardiaceae (the Sumac family). It is a deciduous woody vine that is native to western North America. This vine grows in forests, woodlands, grasslands, and chaparrals. It is extremely variable in growth habit and leaf appearance. It grows as a dense 0.5-4 m tall shrub in open sunlight, a treelike vine 3-9 m long, as dense thickets in shaded areas. The leaves are divided into 3 oak-like leaflets with scalloped, toothed, or lobed edges. The white flowers bloom in the spring, from March to June. The fruits are greenish-white or tan berries. This vine can give you a skin irritation if you touch it accidentally.