Bui. 824, U. S. Dept. of Agriculture. 
Plate I 
Fig. I.— "Puckered" Papilla, Ray 
Floret. (X290.) 
Fig. 2.-Marginal Papill/e, Ray Floret. 
(X2I0.) 
-iH^sc^^ft- 
Fig. 3— Stone Cells, Achenz. 
Fig. 4— Achene Tissues. 
mm - >' v 
W'-W 
Fig. 5— Bract Tissues. (XI20.) 
Fig. 6.— Stem Tissues. (x84.) 
