14 



4i. Two minute nerveless valves below the lloret. Bush 



grass Potamophila prehensile. 



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



Leersia hexandra. 



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



fertile lloret 43 



A single fertile lloret only. No empty valves 5b' 



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



barren florets below the fertile floret 44 



One empty valve or male lloret below the fertile lloret 'iG 



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



kneed Anthoxanthum. 



Valves 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 ... 



Ehrharta. 

 40. Glumes nut falling with the spikelet (Tribe Arundinel- 



leae) 47 



Spikelets falling entire with the glumes (Tribe 



Paniceae) 49 



47. Spikelets in clusters of three, large Tristachya. 



Spikelets solitary 48- 



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



toothed or entire Arundinella ecklonii. 



Spikelets £-H- 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 Solaria. 



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 Trjcholaena. 



Upper glume 7 nerved, lips acute 



Melinis minutiflora var. pilosa. 



53. Spikelets in deciduous clusters, with a false involucre 



of the lower glumes Xnlhephora. 



Spikelets falling singly 54 



54. Glumes subequal, long awned. Awns viscous, cylin- 



drical Oplismenus afrioanus. 



Glumes usually unequal, awnless or shortly awned. Awns 

 scabrid 55 



