4oo 



BOTANICAL GAZETTE 



[NOVEMBER 



13. Pound, R., and Clements, F. E., The phytogeography of Nebraska. 



2d ed. Lincoln, pp. 442. 1900. 



14. Ramaley, F., Climatology of the mesas near Boulder. Univ. Colo. 



Studies 6:19-31. 1908. 



15. Robbins, W. W., Climatology and vegetation in Colorado. Bot. Gaz. 



49:256-280. 1910. 



16. Schneider, E. C, The succession of plant life on the gravel slides in the 

 vicinity of Pike's Peak. Colo. Coll. Publ., Sci. Ser. 12: no. 8. pp. 289- 

 311. 1911. 



17. Shantz, H. L., A stu< 



18. 



'he Bouteloua formation. Bot. Gaz. 42:16-47, 179-207. 1906. 



, Natural vegetation as an indicator of the capabilities of land for 



crop production in the Great Plains area. U.S. Dept. Agric, Bur. PI. 



100 



19. Vestal, A. G., A black-soil prairie station in northeastern Illinois. Bull. 



Torr. Bot. Club 41:351-363. 1914. 



20. Watson, J. R., Plant geography of north central New Mexico. Bot. 



Gaz. 54:194-217. 1912. 



