Bui. 824, U. S. Dept. of Agriculture. 



PLATE III. 



Fig. I.— Crystals, Disc Floret. (x!96.) Fig. 2.— Tooth, Disc Floret. (xI40.) 





Fig. 3.— Pollen Grain. (x290.) 



Fig. 4.— Pollen Grains. (xI40.) 



n 





fig. 5.— Achene Tissue and Crystals. 

 (X204.) 



Fig. 6.— Crystals from Achene. 

 (Magnified.) 



