102 



writer has collected over most of the state east of the Missouri 

 river, and, in company with Mr. J. R. Towne, in the sum- 

 mer of 1897 made very careful examinations of the Little 

 Minnesota river and its tributaries. On this trip many eastern 

 species heretofore unknown to the state were obtained. 



Acknowledgment is due Dr. N. L. Britton, Dr. P. A. Ryd- 

 berg, and Messrs. Nash and Bicknell of the New York 

 Botanical Garden, Dr. L. H. Bailey of Cornell University, and 

 Professor Sargent of the Arnold Arboretum for the verifica- 

 tion and determination of certain species. 



