21 



Fig. 18. — Spikelet of the Oat head, with the bracts spread apart to show 

 the flowers. There are three flowers, only {1) and (;g) of which develop and 

 produce kernels, e, glumes or empty glumes; . /, lemma or flowering glume; 

 pa, palea; s, stamens; p, pistil; r, rachilla. The parts of flowers (f) and 

 (S) are not indicated. Many times enlarged. 



Fig. 19. — Two views of a head of Wheat with some spikelets removed 

 to show the zig-zag rachis. . An edge view of the spikelets is shown at the 

 left and a side view at the right, r, rachis; s, spikelets. 



