Plate XLVIII. Fig. i.—Salt-fiat vegetation, Allenrolfea community. The ground 
between the hummocks is covered with a white crust of salts, 
mostly sodium chlorid. 
Fig. 2 .—Salt-flat vegetation, showing plants of Salicornia utahensis . 
Fig. 3.—Grass-flat vegetation, Sporobolus-Chrysothamnus commu¬ 
nity, showing a species of rabbit brush, associated with tussock 
grass. 
