BARLEY 



135 



(HORDEUM INTERMEDIUM TRANSIENS, KCKE.) 



1. Spikes compact, erect. 



(HORDEUM INTERMEDIUM HAXTONI, KCKE.) 



2. Spikes loose, nodding. 



125. Two-row barley (Hordeum dis- 

 tichum, Linn.). The two-row barleys 

 differ from the other subspecies in the 

 structure and fertility of the flowers. 

 In this subspecies, the flower of the 

 middle spikelet is normally perfect and 

 fertile, but 

 that of the 

 side spikelets 

 is only stam- 

 inate or still 

 further re- 

 duced. As 

 each spikelet 



is one flowered, there is there- 

 fore but two rows of kernels, 



one on each side of the rachis. 



Only the lemma of the middle 



spikelet is awned. The side 



spikelets lie close to the axis. 



In normal forms of these side 



spikelets the lemma is long, 



rounded, obtuse, and without 



awn; filaments, either stunted 



or three well developed; all 



kernels broadest in middle, and 



symmetrical (Figs. 4346). 



FIG. 44. Spikelet 

 of two-row bar- 

 ley, X 2i 



FIG. 45. Kernels of two-row 

 barley. 



