| 23a Chihuahuan Desert Slopes |
| 23b Madrean Lower Montane Woodlands |
| 24a Chihuahuan Basins and Playas |
| 24b Chihuahuan Desert Grasslands |
| 24c Low Mountains and Bajadas |
| 24d Chihuahuan Montane Woodlands |
| 24e Stockton Plateau |
| 24f Rio Grande Floodplain |
| 25b Rolling Sand Plains |
| 25e Canadian/Cimarron High Plains |
| 25i Llano Estacado |
| 25j Shinnery Sands |
| 25k Arid Llano Estacado |
| 26a Canadian/Cimarron Breaks |
| 26b Flat Tablelands and Valleys |
| 26c Caprock Canyons, Badlands, and Breaks |
| 26d Semiarid Canadian Breaks |
| 27h Red Prairie |
| 27i Broken Red Plains |
| 27j Limestone Plains |
| 29b Eastern Cross Timbers |
| 29c Western Cross Timbers |
| 29d Grand Prairie |
| 29e Limestone Cut Plain |
| 29f Carbonate Cross Timbers |
| 30a Edwards Plateau Woodland |
| 30b Llano Uplift |
| 30c Balcones Canyonlands |
| 30d Semiarid Edwards Plateau |
| 31a Northern Nueces Alluvial Plains |
| 31b Semiarid Edwards Bajada |
| 31c Texas-Tamaulipan Thornscrub |
| 31d Rio Grande Floodplain and Terraces |
| 32a Northern Blackland Prairie |
| 32b Southern Blackland/Fayette Prairie |
| 32c Floodplains and Low Terraces |
| 33a Northern Post Oak Savanna |
| 33b Southern Post Oak Savanna |
| 33c San Antonio Prairie |
| 33d Northern Prairie Outliers |
| 33e Bastrop Lost Pines |
| 33f Floodplains and Low Terraces |
| 34a Northern Humid Gulf Coastal Prairies |
| 34b Southern Subhumid Gulf Coastal Prairies |
| 34c Floodplains and Low Terraces |
| 34d Coastal Sand Plain |
| 34e Lower Rio Grande Valley |
| 34f Lower Rio Grande Alluvial Floodplain |
| 34g Texas-Louisiana Coastal Marshes |
| 34h Mid-Coast Barrier Islands and Coastal Marshes |
| 34i Laguna Madre Barrier Islands and Coastal Marshes |
| 35a Tertiary Uplands |
| 35b Floodplains and Low Terraces |
| 35c Pleistocene Fluvial Terraces |
| 35e Southern Tertiary Uplands |
| 35f Flatwoods |
| 35g Red River Bottomlands |