This species occurs in northwestern Mexico, ranging into extreme southwestern United States of America. It ranges from central and northern Sonora, northwest to southern Arizona (Smith and Smith 1979, Berry and Berry 1984, Iverson 1992, Serb et al. 2001). Its elevational range is 100 to 1,100m a.s.l. (Iverson 1989, Ernst et al. 1994, Smith and Smith 1979: 181).