Bui. 180, Bureau of Plant Industry, U. S. Dept. of Agriculture. 



Plate VI. 



Fig. 1.— Spike of Triticum dicoccum 

 dicoccoides, Showing Long Glumes; 

 a Transitional Form to T. poloni- 

 cum. 



(Natural size.) 



Fig. 2.— Spike of Triticum dicoccum 

 dicoccoides, Showing Glumes Re- 

 sembling Those of Durum Wheat. 



(Natural size.) 



