PLATE 6 
A. —In the foreground Isocoma has come in to occupy the land previously 
covered with desert-sage. The original growth of desert-sage is shown in the 
middle of the photograph with thickets of mesquite in the background. The 
mesquite is here parasitized by Phoradendron californicum Nutt. Indio, Calif., 
March 21, 1913. 
B. —Desert-sage association. A pure stand of Atriplex polycarpa (Torr.) S. 
Wats, presenting a uniform, ash-colored, shrubby growth about 3 feet in height. 
Such vegetation characterizes the best agricultural land of the desert valleys. 
South of Indio, Calif., March 6, 1915. 
