14 ] The University of New Mexico 
synthesized, co-ordinated, corrected, and interpreted in the 
light of personal observations which were most extensive 
in Sinaloa, northern Sonora, and northern Chihuahua. The 
following list includes most of the works utilized: 
Audubon, J. W. Illustrated notes, 1852. 
Bell, P. L. Mexican West Coast, 1923. 
Drude, O. “Das Sonorische Florenreich” in Ber. der Freien 
Verein. f. Pflanzengeographie u. Systemat. Bot., Jahre 
1920 u. 1921, 1922. 
Hemsley, W. B. Biologia Centrali-Americana: Botany, vols. 
1-5, 1879-1889. 
Hornaday, William. Camp-fires on Desert and Lava, 1908. 
Hovey, E. C. “The Western Sierra Madre of Chihuahua,” 
in Bull. Amer. Geog. Soc., 37:531-43, 1905. 
Howarth, O. H. “The Western Sierra Madre of Mexico,” in 
Geog. Jour. 6:422-437, 1895. 
Huntington, Ellsworth. The Climatic Factor as Illustrated 
in Arid America, 1914. 
Lumholtz, Carl. New Trails in Mexico, 1912. 
Lumholtz, Carl. Unknown Mexico, 1905. 
MacDougal, D. T. “Across Papagueria,” in Bull. Amer. 
Geog. Soc., vol. 40:705-725, 1908. 
MacDougal, D. T. Botanical Features of North American 
Deserts, 1908. 
MacDougal, D. T. “Delta and Desert Vegetation,” in Botan¬ 
ical Gazette, 38:44-63, 1904. 
McGee, W. J. The Seri Indians , 1895-1896. 
Ortega, J. G. “Exploraclon Biologica por la Cuenca del Rio 
Tamazula,” in Mem. y Rev., Soc. “Ant. Alz.,” 47:145-153, 
1927. 
Pringle, C. C. “Forest Vegetation of North Mexico,” in 
Garden and Forest, 1:70, 105, 117, 141, 226, 238, 429, 
441; 1888. 
Seemann, B. “Flora of Northwestern Mexico,” in Botany 
of the Voyage of the H. M. S. Herald, pp. 255-346, 1852- 
1857. 
Shreve, F. “Deserts of Northwestern Sonora,” in Carnegie 
Inst. Yearbook, 23:138-140, 1924. 
Waibel, L. “Die Nordwestlichen Kustenstaaten Mexikos,” 
in Geog. Zeit, Leipzig, 33:561-567, 1927. 
Wallace, Dillon. Beyond the Mexican Sierras, 1910. 
