Sumac, (genus Rhus), genus of shrubs and small trees belonging to the cashew family (Anacardiaceae), it is native to temperate and subtropical zones. Sumacs have been used as a source of dyes, medicines, and beverages, and the dried fruits of some species are used as a spice in Middle Eastern cuisine. The plants are also grown as soil binders and cover plants. The sumacs grown for landscape use display a graceful habit, spectacular fall colour, or colourful fruit clusters.