DESCRIPTIONS OF TRIBES AND GENERA. 127 



b. Each spikelet with 2-3 $ flowers. 



oc. Spikes terminal, solitary or 2-3 approximate 

 and upright ; spikelets awned. 



I. Flowering glumes with three awns, the 

 middle one from below the entire point, 

 the lateral ones (often short) beginning 



lower down 183. Tripogon. 



II. Flowering glumes with one awn below the 

 entire point. ... 184. Lepidopironia. 

 III. Flowering glumes with one awn below the 

 two obtuse lobes of the point. 



185. Tetrapogon. 



IV. Flowering glume deeply three-cleft; lat- 

 eral divisions pointed, the middle one 

 prolonged into a strong awn. 



186. Astrebla. 



/?. Spikes 1-3, short, terminal, not digitate, spike- 

 lets awnless 192. Ccelachyrum. 



y. Spikes numerous, along a common axis or 

 digitate at its apex ; spikelets awnless. 

 I. Spikelets deciduous as a whole. 



1. Empty glumes four. . 187. Tetrachne. 

 2. Empty glumes two. 189. Beckmannia. 



NOTE. Compare Leptochloa Mpinnata Hochst. 



II. Empty glumes two, persistent, flowering 

 glumes deciduous. 



* Empty glumes with a subulate awn, 



projecting beyond the flowering glumes. 



188. Dinebra. 



** Empty glumes awnless or mucronate 

 pointed, shorter than the flowering 

 glume. 



t Spikelets densely crowded, spikes 

 usually digitate. 



O Spikes with terminal spikelets. 

 190. Eleusine. 



O O Spikes without terminal spike- 

 lets ; the rachis drawn out to a 

 point and projecting beyond 

 them. . 191. Dactyloctenium. 



