155 



2 Spikelets small, awnless. Lower glume minute, 

 rarely 0. Lower valve generally with a minute 

 pale ; nerves 5-7, close, straight, prominent. Digitaria. 



2 Spikelets awnless, or the glumes and the lower 

 valve caudate-mucronate, or caudate-aristate. 

 Lower glume distinct. Lower valve with a 

 2-nerved or a hyaline rudimentary pale, or quite 

 empty. Panioum. 



2 Spikelets fascicled or solitary on a simple axis, 

 or ou tlie branches of a panicle. Glumes and 

 lower valve, or at least the lower glume subulate- 

 aristate. Oplisjienus. 



2 Spikelets of Panicum Upper glume fimbriate. 

 Lower valve with a deeply cleft short pale and 

 a male flower. Axonopus. 



2 Spikelets of Panicum, but subtended by bristles. Setaria. 

 3 Spikelets surrounded singly or in small clusters by 

 an involucre (formed by naked or plumose 

 bristles) and falling with it. Pennisetum. 



3 Spikelets sub-persistent on the flat indistinctly and 



tardily disarticulating rhachis of a false spike. Stewtaphrum. 



4 Upper glume and lower valve 5-nerved ; nerves 

 usually very faint, hidden by copious and long 

 silky hairs, and anastomosing below the obtuse 

 tips. Trichol^na. 



4 Upper glume 7-, lower valve 5-nerved, nerves 

 straight, conspicuous, not anastomosing below 

 the acute tips. Melinis. 



SERIES II. 



A. Blades never transversely veined {in South African species, except 

 sometimes in Arundo) nor articulated on the sheath. 



Awns if present, kneed and twisted below the knee, or 



straight in reduced forms. Group A. 



Awns if present never kneed and twisted below the 



knee. Group B. 



Florets 2, or more in the following : 



Arundinellete ; Avenese ; Arundineas. 

 Floret 1, in the following : 



Agrostese ; Stipese ; Zoysie^e. 



GROUP A. 



FLORETS 2, OR MORE. 

 TRIBE in. ARUNDINELLE^. 



Spikelets solitary on distinct pedicels. 

 Spikelets in clusters of 3. 



