328 FRANCIS RAMALEY 



LITERATURE CITED 



(1) Pool, Raymond J. : A study of the vegetation of the sand hills of Nebraska. 



Minn. Bot. Studies III, 4: 189-312. 1914. 



(2) Pound, Roscoe, and Clements, Frederic E. : Phytogeography of Ne- 



braska. Lincoln, Neb. 1900. 



(3) Ramaley, Francis: Plant zones in the Rocky Mountains of Colorado. 



Science, N. S. 26: 642-643. 1907. 



(4) Ramaley, Francis: The amount of bare ground in some mountain grass- 



lands. Bot. Gaz. 57: 526-528. 1914. 



(5) Ramaley, Francis: The role of sedges in some Colorado plant communi- 



ties. Amer. Jour. Bot. 6: 120-130. 1919. 



(6) Ramaley Francis: Xerophytic grasslands at different altitudes in Colo- 



rado. Bull. Torr. Bot. Club. 46: 37-52. 1919. 



(7) Rydberg, Per Axel: Flora of the Rocky Mountains and adjacent plains. 



New York, 1917. 



(8) Shantz, Homer L. : A study of the vegetation of the mesa region east of 



Pike's Peak. Bot. Gaz. 42: 16-47, 179-207. 1906. 



(9) Vestal, Arthur G. : Prairie vegetation of a mountain front area in Colo- 



rado. Bot. Gaz. 58: 377-400. 1914. 

 (10) Vestal, Arthur G. : Foothills vegetation in the Colorado front range. 

 Bot. Gaz. 64: 353-385. 1917. 



