MACARONI WHEAT 



209 



or in the upper internodes. When well developed they possess 5 or 6 

 internodes above ground. 



Except in the case of one or two varieties, which appear to be hybrids, 

 the ears are always bearded, and either square 

 in section or compressed laterally and oblong 

 in section, in which latter case the 2-ranked 

 side is generally wider than the face of the ear. 

 They are from 4 to u cm. (about ii to 

 inches) in length without the awns, having an 

 average of 21 spikelets per ear, the density vary- 

 ing from about 20 to 47 per 10 cm. length of 

 rachis. 



The rachis is usually tough, though in some varieties it disarticulates 

 more or less easily, especially near the base of the ear ; it is fringed 



Fie. 137. Diagrammatic 

 transverse sections of 

 young leaves of T. durum 

 and T. polonicum . 



5 6 7 8 9 to it 



3 '4 '5 '<> 7 IS K; 20 



FK;. i jS. Empty glumes of Macaroni wheat (T. durum) ( > ). 



P 



