\Spikelets not wnjiJed. 



Involucel present : — 



Involucel.of bristles ... (86 — 89) Setaria. 

 Inyolucel of spines ... (92) Cenchrus. 



:Involucel absent — 



Spikelets sunk in rachls : — 



Rachis cylindrical ... fiiR) Ophiurus. 

 Rachis fiattened ... (171) Oropetium. 



Spikelets not sunk in rachis, 

 Spikelets. . one-flowered :-— 



Spike.one-sided ... (146) Microchloa. 

 Spike not one-sided, 



spikelets ciliate ... (95) Tragus. 

 Spikelets many-lowered (168 — 171) Eragrostis. 



(b) — Inflorescence of v/horled splkes« 



Spikelets iiot awned : — 



Spikelets arranged on one 



side, of the rachis. Rachis 



straight ... (145) Cynod9ii. 



Spikel-ets in t\yo lines,on the 



rachis. Rachis zig-zag. {59—62) Digitaria. 



Spikelets a'witrd, (Hardly awned 

 in Eleusine indica.) 



■ Spikes stout : — 



Inflorescence soft ... (T-50) Chjoris. 



Inflorescence hard ... (1-51,152) Eleusine. 



Spikes very slender ... (ip9,i 10) Arthraj?pno 



(<;) — Inflorescence ppen : — 



Rachis flattened. 



Glumes 3 ... (58) Paspalum. 



Glumes 4, I shorter 



than II and III sheathing (65 — 73) Panlcum. 



Spikelets awned ... (153) Dinebia. 



,E??chis filiform, cvlindrlcal. 



Spikes Ipng, filifprm ... (154) Leptochloa» 



