184 BULLETIN 1074, IT. S. DEPARTMENT OF AGRICULTURE. 



in 1919 is shown in Figure 75. The durums furnish the great bulk of 

 the world's supply of wheat for the manufacture of semolina, maca- 

 roni, and spaghetti. The production of durum wheat in the United 



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Pig. 75.- 



-Outline map of the United States, showing the distribution of durum wheat in 

 1919. Estimated area, 4,340,000 acres. 



States made possible a large macaroni industry, which now uses 

 about a third of the. national production o*f this wheat. The re- 

 mainder is exported or used by American mills or bakeries for mix- 

 ing with other wheats or flour for bread making. 



The varieties that are commercially grown are distinguished by the 

 accompanying key. 



KEY TO THE VARIETIES OF DURUM WHEAT. 



la. SriKE Awned. 



2a. Glumes Glabrous. 

 3a. Glumes White. 

 4a. Awns White. 



5a. Kernels Red ( Triiicum durum affine Kcke.). 



Kernels Mid long, Hard Pentad 



4b. Awns Black. 



oa. Kernels White (Amber) ( T. d. leucomelan Al.). 



Kernels Very Long, Hard , Peliss 



3b. Glumes Yellow. 

 4a. Awns White. 



5a. Kernels White ( T. d. hordeiforme Host.). 

 Kernels Long, Hard. 

 Spike fusiform. 



Plant midtall; beaks 1-2 mm. long Acme.._ 



Monad 



Plant tall; beaks 1-5 mm. long Arnautka 



Mindum 



Spike oblong; plant tall. 



Beaks 1-2 mm. long Kubanka 



Kubanka No. 8 



BUFORD 



Beaks 1-10 mm. long Marouani 



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