Genus Pistacia is a group of plants that features several species including the well-known and beloved Pistachio tree. This genus is characterized by having compound leaves with leaflets growing opposite each other. The fruits are small, round, and usually have a hard shell that contains a seed that is edible in the case of the pistachio. Other common members of the genus include the terebinth tree, mastic tree, and sumac. As for synonyms, this genus is sometimes referred to as the Pistacia family or simply as the Pistachio tree family due to its most well-known and popular member.