352 BOTANICAL GAZETTE [November 



considerable. At present I have not sufficient data to enable me to 

 discuss this question fully. 



m Closing tnis paper, 1 wish to express my appreciation of the 

 kindly interest taken in my work, and assistance given me by Drs. C 

 E. Bessey and F. E. Clements, of the University of Nebraska, and 

 by Dr. Francis Ramaley, of the University of Colorado. For 

 identification of my collection I am indebted to the New York 



^Telson, Laramie, Wyoming, and 

 Mr. A. S. Hitchcock, of the United States Department of Agriculture. 



University of North Dakota 



I 



t 



t 



t 



I 



f 



