Rank ReasonsFrom the Trans-Pecos region of western Texas, westward through southern New Mexico into southeastern Arizona, and southward into adjacent regions of Chihuahua and Coahuila. (Type, Unite States, Texas) Its found in rocky washes and in the gravelly or sandy alluvium of arroyos in desert associations with species of Fouquieria, Agave, Ephedra, Prosopid, Acacia, Mimosa, Dasylirion, and Larrea at elevations of 900-1750 m.