324 



THE CEREALS IN AMERICA 



and (2) two-rowed barley {H. sat, distichon Hackel). In the 

 six-rowed type there are three spikelets each bearing a single 



grain arranged alternately at 

 each joint of the rachis, thus 

 making a spike with six rows 

 of grains. When the lateral 

 or outside grains of the alter- 

 nate sets overlap in such a 



Six-rowed barley : on the left three single grained 

 spikelets at one joint of the rachis, each with 

 two outer glunries, c. In the spike on the right 

 there are in view only two rows made up of the 

 outer grains, a, of the spikelets upon opposite 

 sides of the rachis. Spikelet, natural size; 

 spike, one-third natural size. 



manner as to form one instead of 

 two rows on each side, the type is 

 known as four-rowed barley {H, 

 sat. viilgare Hackel), frequently 

 called here or bigg in England, 

 In the six-rowed type it not infre- 

 quently happens that it is only four- 

 rowed towards the tip of the spike. 



Two-rowed barley: on the left, three 

 spikelets at one joint of the rachis, 

 the outer two, a, being rudimentary, 

 the middle one, b, only having devel- 

 oped into a grain ; c, outer glume. 

 ■^ne rudimentary, a, and developed, 

 1:'', grain are shown in spike on the 

 right. Spikelet, natural size ; spike, 

 one-thi'd natural size. 



