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



Plate XXXI. 



1 



B 



SlLVERCOIN (A). 



TRIPLET (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. 



