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



Plate LI I. 



• 



A 



Bluechaff (A). 



Dale (B). 



i hi :i i i/c: t'liitnoa from lower, central, and upner portions of spike, natural 

 hri ■ po ll Ion andintran vci g lection, magnified ■ '• diameters. 



