Vegetation of Northwest Mexico 
[13 
Aldous, A., and Shantz, H. “Types of Vegetation in the 
Semi-arid Portion of the U. S. Jour. Agric. Research 
28: 99-128, 1924. 
Bailey, V. Biological Survey of Texas, 1905. 
Bailey, V. Life Zones and Crop Zones of New Mexico, 1913. 
Bowman, Isaiah. Forest Physiography, 1911. 
Bray, W. L. Distribution and Adaptation of the Vegeta¬ 
tion of Texas, 1906. 
Bray, W. L. Vegetation of the Sotol Country in Texas, 1905. 
Clements, F. C. Plant Indicators , 1920. 
Coulter, J. Botany of Western Texas, 1891-1894. 
Griffiths, D. Native Pasture Grasses of the U. S., 1915. 
Livingston, B., and Shreve, F. The Distribution of Vegeta¬ 
tion in the United States, as Related to Climatic Con¬ 
ditions, 1921. 
MacDougal, D. T. The Salton Sea, 1914. 
Mearns, E. A. Mammals of the Mexican Boundary of the 
U. S., 1907. 
Meinzer, E. O. Plants as Indicators of Ground Water, 1927. 
Merriam, C. H. Life Zones and Crop Zones , 1898. 
Newberry, J. S. “Flora of the Country Bordering the Rio 
Grande in Chihuahua and Texas,” in Bulletin. Torrey 
Botanical Club, vol. 10. 
Pellett, F. C. American Honey Plants, 1923. 
Sampson, A. W. Native American Forage Plants, 1924. 
Shantz, H., and Piemeisel, “Indicator Significance of the 
Natural Vegetation of the Southwestern Desert Region,” 
Jour. Agric. Research, 28:721-801, 1924. 
Shants, H., and Zon, R. Atlas of American Agriculture: 
Natural Vegetation, 1924. 
Shreve, Forrest. “A Map of the Vegetation of the United 
States,” in Geographical Review, 3:119-125, 1917. 
Shreve, F. The Vegetation of a Desert Mountain Range as 
Conditioned by Climatic Factors, 1915. 
Spalding, V. M. Distribution and Movement of Desert Plants 
1909. 
Thornber, J. J. The Grazing Ranges of Arizona, 1910. 
Torrey, John. Botany of the U. S. and Mex. Boundary, 1859. 
Wooton, E. and Standley, P. The Flora of New Mexico, 1915. 
The data on individual areas in northwestern Mexico 
were derived mainly from scientific reports and travelogues 
having vegetational data only incidentally. These data were 
