Misc. Pub. 303. U. S. Dept. of Agriculture 



PLATE 6 



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A, Celtis douglasii. This hackberry, like others in the genus, thrives in extremely arid regions. Its value 

 as cover in an otherwise barren country is very great. B, Ceanothus prostratus forms perfect cover on part 

 of a dry railroad embankment. 



