Range extends from southeastern Utah, southern Colorado, Kansas, and central and southern Missouri south through Arizona, New Mexico, western and central Texas, Oklahoma, and Arkansas to Sonora and north-central mainland Mexico (Zacatecas and San Luis Potosi) (McGuire 1996, Stebbins 2003). Records for Louisiana may not represent natural occurrences (Dundee and Rossman 1989, McGuire 1996).