A STUDY OF THE BARLEY HEAD 



125 



three on opposite sides of the rachis. In two-rowed barleys 

 there is a single row of spikelets on each side of the rachis. 

 There is an undeveloped spikelet on either side of the devel- 

 oped spikelet. Each de- 

 veloped spikelet contains 

 but one kernel of barley. 

 Figure 10 shows the differ- 

 ent parts of the barley 

 spike. 



Equipment. Heads of 

 barley for each member of 

 the class. 



Directions. Make two 

 drawings of the entire head 

 of a six-rowed barley, one 

 showing the side and one 

 showing the edge view. 

 Make a drawing of a group 

 of three spikelets. Make 

 a drawing of a single spike- 

 let, showing the flowering 

 and outer glume. Make 

 drawings of the kernel, one 



c 



FIG. 10. A, a head of six-rowed barley ; 

 B, a single spikelet of barley ; C, a 

 kernel of barley with glumes and 

 palea removed. 



showing the germ side and 

 one showing the cross sec- 

 tion. Remove all the 

 spikelets and make a draw- 

 ing of the rachis. Make all drawings at least four times the 

 natural size, except the head and rachis. Make them in 

 careful detail and name all the different parts. 



