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Southern Post Oak Savanna

Ecoregion in TX

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The Southern Post Oak Savanna ecoregion has more woods and forest than the adjacent prairie ecoregions (32 and 34), and consists of mostly hardwoods compared to the pines to the east in Ecoregion 35. Historically a post oak savanna, current land cover is a mix of post oak woods, improved pasture, and rangeland, with some invasive mesquite to the south. A thick understory of yaupon and eastern redcedar occurs in some parts. Many areas of this region have more dissected and irregular topography than Ecoregion 33a to the north. The soils generally have an ustic soil moisture regime compared to udic in Ecoregion 33a, and more sand and sandy loam surface textures. It is underlain by Miocene, Oligocene, Eocene, and Paleocene sediments. Sand exposures within these Tertiary deposits have a distinctive sandyland flora, and in a few areas unique bogs occur.

— EPA

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Ecoregion