42 



30. Glumes and lower valve equal, very similar, 5 nerved. 



P. natalense. 

 hovfer glume smaller. Upper glume 7 nerved 31 



31. Lower valve 9 nerved P. minus. 



Lower valve 5 nerved P. dregeanum. 



32. Spikelets obtuse or sub-obtuse 33 



Spikelets distinctly acute or acuminate 36 



33. Spikelets 2-3 lin. "long, turgid 34 



Spikelets 1-1^ lin. long, not turgid 35 



34. Tips of glumes and lower valve callous. Lower valve 



5 nerved P. zizanioides. 



Tips of glumes and lower valve not callous. Lower valve 

 7 nerved P. deustum. 



35. Perennial. Lower valve 5 nerved. Upper flnely wrinkled. 



P. maximum. 

 Annual. Lower valve 7-9 nerved. Upper quite smooth. 



P. laevifolium. 



36. Pedicels very short. Spikelets glaucous. Glume and 



valve faintly 5 nerved P. meyerianum. 



Pedicels 2-6 lin. long. Spikelets not glaucous. Glume 

 and valve distinctly 5-13 nerved 37 



37. Spikelets acute. Upper glume 11-13 nerved ... P. miliare. 

 Spikelets acuminate. Upper glume 5-9 nerved 38 



38. Longer pedicels up to 2h lin. long P. proliferum. 



Longer pedicels up to 6 lin. long P. capillare. 



PASPALLjVI. 



i. Culms usually erect. Spikelets obtuse or sub-obtuse. 



P. scrobiculatum. 

 Culms ascending from a creeping base. Spikelets 



acute 2 



2. Lateral false spikes sessile or subsessile ... P. digitaria. 

 False spike peduncled P. disticlium. 



PENNISETUM. 



1. Involucre reduced to a solitary bristle ... P. unisetum. 

 Involucre not reduced to 1 bristle 2 



2. Annual. Tall stout plant. Involucre peduncled ... 



P. typlioideum. 

 Perennial, not stout. Involucres sessile 3 



3. Bristles plumose P. cenchroides. 



Bristles not plumose 4 



4. Anther tips penicellate. Styles connate or cohering for 



half their length. Lodicules P. tlnmbergii. 



Anther tips naked. Styles almost free. Lodicules 

 distinct 5 



