Carya texana, the black hickory, is a North American tree in the walnut family. It is endemic to the United States, found primarily in the southern Great Plains and the Lower Mississippi Valley.Carya texana is an endangered species in southwestern Indiana.Carya texana is a tree growing to 41 metres (135 ft) in height. The leaves usually have a dense coating of scales, imparting rusty brown color. They are pinnately compound usually with 7 leaflets but sometimes 5 or 9.