350 FIELD CROPS FOR THE COTTON-BELT 



Table ^ 34. Average Composition of Barley and its By- 

 products 



432. Types of barley. ^ Most authorities recognize 

 two well-marked types of barley. These are: (1) six-rowed 

 barley (Hordeum sativum hexastichon) and (2) two-rowed 

 barley {H. sativum distichon). In the six-rowed type, each 

 of the three spikelets borne at a single joint on the rachis 

 produces one grain. As each joint produces three grains 

 and as these grains are arranged alternately at the various 

 joints of the rachis, they are produced in six distinct rows. 

 Sometimes a four-rowed barley is produced in that the 

 lateral or outside grains of the alternate sets overlap so as 

 to form one instead of two rows on each side. Six-rowed 

 barley may be four-rowed toward the tip of the spike. ' In 

 the two-rowed type the lateral grains fail to develop, in 

 which case the spike is composed of two rather than six 

 rows of grains. In this type the joints of the rachis are 

 farther apart; hence the spike is longer and less compact 

 than in the six-rowed type. The two-rowed barley is a 

 spring variety and is the kind that is largely grown in 

 Europe for the production of malt, the- four- or six-rowed 

 barleys being used as food^or domestic animals. 



There is a hull-less or naked barley {H. nudum) which 

 is also beardless. This type is little grown as it is a poor 



