DESCRIPTIONS OF TRIBES AND GENERA. 127 



b. Each spikelet with 2-3 § flowers. 



a. 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. 

 ft. Spikes 1-3, short, terminal, not digitate, spike- 

 lets awnless 192. Coelachyrum. 



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 Lepiochloa bipinnata 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. 



