21 



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

 the flowers. There are three flowers, only (1 ) and (2} 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 (2} and 

 (5) 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. 



