JANUARY 1 TO DECEMBER 31, 19 49 



435 



Wheatgrass, awned. See Agropyron 

 caninum. 



crested. See A. cristatum. 



slender. See A. trachycaulum. 

 Witorgia armata, 179792. 



olcordata, 179793. 



spp., 179794-179796. 



Xanthium strumarium, 180906. 

 sp., 177582. 



Yam-bean. See Pachyrhizus erosus. 

 Yew, English. See Taxus baccata. 



Zea mays, 172313-172335, 172590- 

 172603, 173828-173831, 174412-174419, 

 174990, 175334-175337, 175966-175984, 



Zea mays — Continued 



176799-176806, 177103-177118, 177583- 

 177652, 179127-179144, 179560-179582, 

 180016, 180162-180167, 180230, 180231, 

 180359, 180533-180576, 180791, 181163, 

 181834-181844, 181903, 181966, 18198&- 

 181990, 182015, 182319-182329, 182785, 

 182808-182830, 183004, 183367, 183368, 

 183492, 183493, 183639-183649, 183726- 

 183815, 184276-184287, 184356-184360, 

 184742, 184743, 185042-185074, 185098, 

 185444, 185618-185620, 185664, 185665. 



Zinnia. See Zinnia spp. 



Zinnia elegans, 172491. 



spp., 180907-180911, 181845. 



Zizyphus mucronata, 184853. 



Zygophyllum fabago, 181133. 

 sp., 185592. 



U. S. 60VERNMENT PRINTING OFFICE: 1958 



