110 KANSAS UNIVERSITY SCIENCE BULLETIN. 



Lloyd, F. E., 1908. Physiology of Stomata. Carnegie Inst, of Wash. 

 Publication No. 82. 



Lloyd, F. E., 1908. Some Features of the Anatomy of Guayule {Par- 

 theninm argevtatnm Gray). Plant World, August, pp. 172-179. 



MacDougal, D. T., 1904. Delta and Desert Vegetation, Bot. Gaz. 38, 

 44-63. 



MacDougal, D. T., 1908. The Vegetation of the Tucson Region, Uni- 

 versity of Arizona Monthly, May, pp. 1-18. 



MacDougal, D. T., 1908. The course of the Vegetative Season in South- 

 ern Arizona, Plant World, vol. II, pp. 216, 237, 261. 



Ramaley, Francis, 1909. Wild Flowers and Trees of Colorado. Plants 

 and their Distribution, pp. 11-20. 



Sargent, C. S., 1905. Manual of the Trees of North America, p. 682. 



SCHIMPER, A. F. W., 1903-'04. Plant Geography upon a Physiological 

 Basis. Translation, Oxford. 



Spalding, V. M., 1904. Biological Relation of Certain Desert Plants. 

 Bot. Gaz. 38, 122-138. 



Stevens, W. C, 1907. Plant Anatomy. 



Van Dyke, J. C, 1904. The Desert, p. 140. 



Vassey, Geo., and Rose, J. N., 1890. List of Plants Collected by Dr. 

 Edward Palmer in Lower California, in 1889. Contr. from U. S. 

 Nat. Herb. I, 33, Washington, 



