Bui. 1074, U. S. Dept. of Agriculture. 



Plate XI, 



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V"' 



A 



B 



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r v i\ M :'; 



i j , 



Pacific Bluestem (A). 



Gypsum (B). 



Spikes, face and side views, natural size; glumes from lower, central, and upper portions of spike, 

 natural size; kernels in three positions and in transverse section, magnified 3 diameters. 



