PLATE 7 
A. —A single plant of seepweed showing the nature of the top and the root 
system to a depth of 2 feet. A salt crust which covers much of the seepweed 
land is here clearly shown. Thermal, Calif., March 5, 1915. 
B. —A plant of Atriplex polycarpa (Torr.) S. Wats, showing the character of 
the root system with a tap root of over 5 feet. At a depth of 1 foot many laterals 
are developed, indicating that the plant receives most of its growth water from 
about this depth of soil. Near Indio, Calif., March 7, 1915. 
