The leaves and stems of fragrant sumac have a citrus fragrance when crushed, and it inhabits mostly uplands areas, while poison ivy has no odor and can inhabit various habitats.
Anacardiaceae (the cashew or sumac family) are a family of flowering plants bearing fruits that are drupes and in some cases producing urushiol, an irritant. Anacardiaceae include numerous genera with several of economic importance. Notable plants in this family include cashew (in the type genus Anacardium), mango, poison ivy, sumac, smoke tree, and marula. The genus Pistacia (which includes the pistachio and mastic tree) usually is now included, but has sometimes been placed in its own family, Pistaciaceae.