TYPES OF AWN 



179 



sometimes called four-row barley, but examination will show that 

 the two irregular rows are made up of the overlapping lateral rows 

 from opposite sides. Figure 64 gives a comparison of two types of 

 barley grains. 



The Hulless Barleys. In ordinary barley the outer husk is 

 tightly attached to the kernel, but there are forms belonging to all 



FIG. 64. 



FIG. 65. 



FIG. 64. Comparison of two-row and six-row barley grains. Upper figures two-row 

 barley grains and lower figures six-row barley grains. Note that the two-row grains art 

 larger and the crease is straight, while in the six-row the two lateral grains are twisted 



FIG. 65. Kernels of hulless barley. 



the four main groups in which the kernels are free from the hull 

 (Fig. 65). 



Types of Awn. Most of the cultivated barleys have a long stout 

 awn, but there are at least four variations : 



1. Ordinary long stout awns. 



2. Awns deciduous, i.e., drop off as the grain ripens. 



3. Awnless or awn pointed. 



4. Hooded or trifurcate tips (Fig. 66). 



