The state tree of Texas is the Pecan, which is a species of hickory native to Mexico and the south-central and southeastern regions of the United States. The Pecan tree is known for its edible nut, which is used in many recipes and desserts. It is also a popular ornamental tree, with its large, compound leaves and attractive bark. The Pecan is the official state tree of Texas, and it is also the state tree of Arkansas and Oklahoma.