CLEMENTS 



Desert Plains 



PLATE 28 



h^b&y-i 



A. lioutcloua-Ililaria association, Empire \alk'y. Arizona. 



B. Bouteloua rothrockii and Arislida divaricata, Santa Rita Reserve, Tucson, Arizona. 



C. BouUlotta racemom consociation, Oracle, Arizona. 



