256 



The aim of the work was to obtain a clear idea of the extent and 

 floristic composition of the associations of the region to serve as a 

 foundation for further work upon the successional relationships be- 

 tween the competing associations of the three provinces which are 

 represented in the area. 



Although the region had been visited for collecting purposes dur- 

 ing some of the four years previous to 1908, work upon a strictly 

 ecological basis was pursued only during the seasons of 1908, 1909, 

 and 19 10. A summary of the trips taken is here presented in tabu- 

 lar form. 



Date. Plants Collected. Persons Accompanying Author. 



June 8, 1908 Nos. 2448-2526 



June 29, 1908 2743-2779 Mr. N. L. Partridge and Mr. J. Sanford. 



July I, 1908 2780-2827 Dr. H. M. Pepoon, Prof. L. M. Umbach, 



and Mr. N. L. Partridge. 



July 10, 1908 2828-2864 Mr. Carl Durand. 



July 27, 1908 2865-2875 Dr. H. A. Gleason. 



Aug. 3, 1908 2876-2907 



Aug. 7, 1908 2908-2924 Mr. Carl Durand. 



Aug. 14, 1908 2925-2946 



Aug. 21, 1908 2947-2975 



Aug. 28, 1908 2976-2993 



Oct. 31, 1908 2995-2997 



Dec. 25, 1908 Mr. N. L. Partridge. 



Jan. I, 1909 Mr. R. R. Sleeper. 



June 16, 1909 3014-3040 



June 22, 1909 3041-3065 



July 12, 1909 3078-3126 



July 19, 1909 3127-3163 



July 28, 1909 3164-3182 



Aug. 17, 1909 3201-3207 Mr. N. L. Partridge. 



Aug. 24, 1909 3208-3221 



Aug. 30, 190Q 3223-3259 



Sept. 4, 1900 3260-3278 



Sept. II, 1909 3279-3284 



Oct. 17, 1909 3285-3292 



Nov. 24, 1909 



Dec. 25, 1909 



Mar, 24, 1910 



Aug. 13, 1910 Mr. A. G. Vestal. 



Sept. 9, 1910 



Three nearly complete sets of the plants of the region were col- 

 lected. One of these has been deposited in the Herbarium of the 

 University of Illinois, another is in the author's private collection, 

 while the third is in the Field Museum of Natural History, at Chi- 

 cago, Illinois. 



Location and Physiography 



Geographically, this area is located along Lake Michigan, extend- 

 ing from Waukegan, Lake County, Illinois, to Kenosha, Kenosha 



