14 



41. Two minute nerveless valves below the Iloret. Biisli 



grass Polamophila prelieiisiLs. 



No empty valves. Fruiting valves ciliate. Vlei grass ... 



Leersia hexaiidra. 



42. One or more empty valves or male florets below the 



fertile floret 43 



A single fertile floret only. No empty valves 56 



43. Two empty valves (sometimes minute), or 2 male or 



barren florets below the fertile floret 44 



One empty valve or male floret below the fertile floret 46 



44. Lower (empty or male) valves awned dorsally. Awns 



kneed Anthoxanthum. 



\'alves awnless or awned from the tip. Awns straight 45 



45. Empty valves minute, enclosed by the glumes ... Phalaris. 

 At least one of the empty valves larger than the fertile ... 



Ehrhai'ta. 



46. Glumes not falling with the spikelet (Ti'ibe Arundinel- 



leae) 47 



Spikelets falling entire with the glumes (Tribe 



Paniceae) 49 



47. Spikelets in clusters of three, large Trislachya. 



Spikelets solitary 4S 



48. Spikelets less than i inch. Upper valve minutely 2 



toothed or entire .4rundinella ecklonii. 



Spikelets ^-1^ inches. Upper valve distinctly 2 toothed 

 or 2 lobed Trichopteryx. 



49. Spikelets subtended by bristles (1 or many) 50 



Spikelets not subtended by bristles 51 



50. Bristles persistent Selaria. 



Bristles falling off with the spikelet Pennisetum. 



51. Glumes or lower valve 2 lobed or emarginate, muticous 



or awned from the sinus. Lower glume minute 



or O 52 



Glumes and lower valve entire, awnless or awned. Lower 



glume .distinct 53 



52-. Upper glume 5 nerved, tips obtuse Tricholaena. 



Upper glume 7 nerved, tips acute 



Melinis minutil'Iora var. pilosa. 

 53. Spikelets in deciduous clusters, with a false involucre 



of the lower glumes Anlhepliora. 



Spikelets falling singly 54 



5'i. Glumes subequal, long awned. Awns viscous, cylin- 

 drical Oplismenus africanus. 



Glumes', usually unequal, awnless or shortly awned. Awns 

 scabrid 55 



