37 



37. Valves purple or violet with yellowish tips ... E. bieolor. 

 Valves not purple or violet with yellowish tips 38 



38. Annual. Valves very obtuse, truncate or subemarginate. 



E. porosa. 

 Perennial. Valves acute or obtuse, not truncate ... 39 s 



39. Culms repeatedly geniculate, branched. Valves imbri- 



cate, obtuse E. lehmanniana. 



Culms simple or it sparingly branched below then valves 



looser and more acute 'iO 



10. Sheaths bearded; lower not or indistinctly compressed. 



E. chloromelas. 



Sheaths beardless or almost so; lower compressed and 



keeled 41 



41. Pedicels up to i tin. long. Blades about inches. 



E. margaritacea. 



Pedicels and branches very long - , capillary llexuous. 



Blades 1 ft. long or longer E. nenulosa. 



42. Glumes and valves firm, almost chartaceous, shining. 



Spikelets oblong E. dura- 

 Glumes and valves thin to very thin. Spikelets lanceo- 

 late " 43- 



43. Culms branched, 5-0 noded. Branches solitary, or lower- 



most sub-opposite E. burchellii. 



Culms simple or almost so, 2-5 noded. Branches of 

 panicle more or less whorled 44 



44. Panicle somewhat dense and rigid. Pedicels very short. 



Valves acute E. sporofooloides. 



Panicle very lax; divisions capillary, flexuous. Pedicels 

 1 lin. long or much longer. Valves obtuse or sub- 

 obtuse 35 



45. Panicle long, exserted from the uppermost sheath ... 



E. atherstoneL 



Panicle shortly exserted from, or enclosed at the base 



in the uppermost sheath E. mierantha. 



EHIAMIIIS. 



1. Blades subterete, solid ' E. juneeus. 



Blades not terete 2' 



2. Blades flat, 4-0 iin. wide. Rachis and branches of panicle 



glabrous E. capensis- 



Rlades almost reduced to midrib below. 2 lin. wide.. 

 Rachis and branches of panicle pubescent at the 

 nodes E. sorghiirru 



