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Lower Rio Grande Alluvial Floodplain

Ecoregion in Atlantic Coastal Plain, TX

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The Lower Rio Grande Alluvial Floodplain ecoregion includes the Holocene-age alluvial sands and clays of the Rio Grande floodplain that are now almost completely in cropland or urban land cover. The soils, mostly Vertisols and Mollisols, are deep, loamy and clayey, and tend to be finer-textured than in Ecoregion 34e to the north. Some Entisols and Inceptisols occur near the river. The floodplain ridges once had abundant palm trees, and early Spanish explorers called the river “Rio de las Palmas.” Most large palm trees and floodplain forests had been cleared by the early 1900’s. A few small pieces of unique floodplain forests remain, including Texas ebony, Texas palmetto, and sugar hackberry-cedar elm floodplain

— EPA

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