HORDEUM 



147 



3. Hordeum distichon erectum (erect-eared barley). — In 

 this the heads are erect and broad. On the dorsal side of 

 the grain at the base, there is a characteristic crown furrow, 

 so that in longitudinal section a rounded hump shows (Fig. 

 54). Rachis joints are from 2.1 to 2.7 millimeters long. 

 The rachilla is hairy and broadened. 



Fig. 54. — Bases of the grains of two-rowed barleys. A, 5, nodding barley 

 (Hordeum distichon nutans); C, D, erect-eared barley (H. distichon erec- 

 tum). (After Newman.) 



4. Hordeum distichon nutans (bent or nodding barley). — 

 In this the heads hang down when ripe. On the dorsal side 

 of the grain at the base, there is a slight horseshoe-shaped 

 depression. In lengthwise section, the base of the kernel 

 slopes off (Fig. 54). Rachis joints are 2 .8 to 3.5 millimeters 



