Plate LV. 



Fig-. 1. A swale near Ziou City, Illinois, showingr the Calamagrosiis canadensis association 

 in the foreground and an aspen-willow grove in the background', separated by a narrow zone 

 of shrubs. September 4, 1909. 



-*■- 



;-f«<j aae W.i ^r^^ 







Fig. 2. /"///oAj^/a/'f^/v/wf? consocies of the blazing star (/./(//^M .«/;>■«/«) prairie. Beach, Illi- fl 



nois. July 19, 1909. ' 



