Post oak savanna

The post oak savanna is an ecoregion found in parts of east-central Texas. Although it receives 35 to 45 inches of precipitation as annual average, many areas look somewhat arid due to a claypan subsoil. Post oak and blackjack oak are most common and other oak species include southern red oak, bur oak, and chinkapin oak. Black hickory is abundant here and there; cedar elm, common persimmon, sugarberry and eastern red cedar are also conspicuous. As a transitional area between piney woods to the east and prairie to the west, it hosts species from a variety of moisture regimes. Loblolly pine, wooly birch and red maple range in from more humid eastern regions, and there are even peat bogs. On the other hand, plants characteristic of arid sites include honey mesquite, prickly pear cactus and two species of yucca.