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Simpson Township Barrens is a unique ecological area containing several native plant communities such as limestone barrens, seeps, dry and dry-mesic upland forest, an intermittent creek drainage and support a rich diversity of plants. The limestone barrens communities are characterized by very dry, calcium rich soils that support a flora more commonly encountered on the tall grass prairies found north of the Shawnee National Forest. At the Simpson Township Barrens Ecological Area two limestone barrens are located within a matrix of dry and dry-mesic upland forest each with a southwestern aspect. The dry and dry-upland oak forests are dominated by post oaks (Quercus stellata), white oaks (Quercus alba) and black oaks (Quercus velutina). pignut hickory (Carya glabra), and mockernut hickory (Carya tomentosa) are also commonly encountered. Unlike the barrens community the forested matrix is characterized by sandstone cliffs, sandstone boulders and other sandstone rocks giving the soils a somewhat sandy consistency. The soils are acidic and support a flora completely different from the limestone barrens.