As a result of certain geologic formations in eastern Texas, springs and seepages are often encountered on slopes of hills. Their flora is quite distinct. Laurel greenbrier is a common woody vine. Riverbottom Communities . Hardwood forests occupying riverbottoms in eastern Texas include trees and other plants that are able to tolerate fairly long periods of flooding.
Soils are usually clay loams or silty clay loams.
Bottomland forests, as a result, are quite distinct floristically from more upland communities. Swamp Communities . Swamps are wet areas with standing water, trees, and other aquatic plants. Soils are mucky loams. There are different kinds of swamps depending on the combination of shrubs and trees present.