The Little Picacho Wilderness is located in the southern portion of the Lower Colorado River Valley, with its eastern side along the Colorado River (Little Picacho Wash runs ~ 1.5 miles (2 km) downstream); and is 10 miles (16 km) north of Yuma, Arizona and Winterhaven, California. The wilderness area protects a region of the southeastern Chocolate Mountains.
Turner, Bowers, & Burgess. Sonoran Desert Plants; an Ecological Atlas, Raymond M. Turner, Janice E. Bowers, Tony L. Burgess, c 1995, Univ. of Arizona Press, Tucson. 504 pages.