Bui 4 Bureau of Plant Industry U. S. Dept. of Agriculture. 



Plate IV. 





Fig. 1 .— Shad Scale Atriflex canescens in fenced Field near Tucson, Ariz. 



"-- '--^ :■■ ^--~e: -'_-'-- \ Plantago fastigiata a 

 Erodium cicutarium on Way to Market, May, 1901 



1 



