PLATE 11 
A. —A pure stand of chamiso with many annuals occupying the interspaces as 
it appears on the “sand bars” in the Gila Valley. This photograph was taken at 
boring No. 2. (See Table XXII.) Chandler, Ariz., March 16, 1916. 
B. —An old plant of Atriplex canescem (Pursh) Nutt, (chamiso) illustrating 
the habit of its roots on a sandy soil. The lateral root measured more than 9 feet. 
The top, with very few leaves, is characteristic of the plants at this tipae of the 
year. Indio, Calif., September 15, 1914. 
