HORDEUM 



137 



no apical spikelet in barley. The groups of spikelets are 

 arranged alternately on the rachis. 



Spikelet and Flower. — Each spikelet is one-flowered . The 

 glumes are narrow and awn-like, forming an apparent in- 



FiG. 50. — I, triplet of spikelets of six-rowed barley (Hordeum vulgare 

 hexastichon) ; 2, of hooded barley (H. vulgare trifurcatum) ; 3, of medium 

 barley (H. vulgare intermedium); 4, of two-rowed barley (H. distichon). Nat. 



volucre about the spikelets. The lemma is broad, rounded 

 on the back, five-nerved at the apex and bears a long awn 

 with strongly barbed edges. In threshing barley care is 

 taken not to break the awn so close that the end of the kernel 



