HUC Code | Watershed Name | Occurrence | Source |
13040203 | Black Hills-Fresno | Current | NatureServe |
13040204 | Terlingua | Current | NatureServe |
13040205 | Big Bend | Current | NatureServe |
13040206 | Maravillas | Current | NatureServe |
13040208 | Reagan-Sanderson | Current | NatureServe |