The Thornthwaite annual P-E indices range from 15 to 32. These are the Hoban , Hodgins , Mimbres , Monahans , Reagan , Reakor , Reeves , Upton and Verhalen series. All these soils do not have vertic properties. All except the Verhalen series are in slightly higher positions. Verhalen soils are in similar postions.
Permeability is very slow.
Runoff is negligible to low. Vegetation is dominantly tobosa grass and some buffalograss, blue grama, and widely spaced scrubby mesquite and prickly pear. Trans-Pecos and other areas of southwestern Texas and possibly in southern New Mexico. The series is of large extent. Lincoln Lab data available for 1 pedon - Pecos County, Texas.