6 BULLETIN 981, U. S. DEPARTMENT OF AGRICULTURE. 



Several other grass sorghums discovered in Africa and near-by 

 islands since the introduction of Sudan grass into the United States 

 indicate the possibilities which exist in this comparatively unexplored 



Fig. 4.— A typical plant of the Sumac sorgo-Johnson grass hybrid, F. C. I. No. 5846. Photographed at 

 the Arlington Experimental Farm, Va., October 12, 1913. 



continent. Among these introductions are Tunis grass, toura, Kam- 

 erun grass, and tabucki grass. 



A discussion of these different grass sorghums has been introduced 

 in order to show the very easy and natural gradations in forms already 



