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. 



