13 



(Astrebla has the inflorescence, but not the glumes of Chlorides.) 



Spikelets one-flowered. 



Spikelets awnless, in digitates pikes, the rhachis 

 of the spikelet not at all or minutely 

 produced above the flower ... ... 72. Cynodon. 



Spikelets awned, in a simple or in digitate spikes, 

 with one or more empty glumes above 

 the flowering one ... ... ... 73. Chloris. 



Spikelets several flowered (rarely one flowered in 

 Leptochloa). 



Flowering glumes entire. 



Grain or seed within the pericarp loose and 

 rugose. Spikelets in digitate or scat- 

 tered spikes, awnless or with long 

 pointed glumes ... .. ... ... 74. Eleusine. 



Grain smooth, the pericarp adnate. Spikelets 



awnless, in scattered spikes ... ... 75. Leptochloa. 



Flowering glumes with a minute point between two 

 small hyaline lobes. Spikelets in a single 

 or in scattered spikes, awnless ... ... 76. Diplachne. 



Subtribe III. — Milieae. — Spikelets one or two flowered, in a loose or 

 narrow and dense panicle, the rhachis of the spikelet not produced above the 

 upper flower. Outer glumes usually convex, several-nerved or almost 

 nerveless, unawned. Plowering glumes nearly similar, unawned or with one 

 straight awn. Grain free. 



Rhachis of the spikelet glabrous or nearly so. Outer 

 glumes faintly-nerved. Flowering glumes 

 unawned. 



Spikelets one-flowered 77. Sporobolus. 



Spikelets two-flowered, the flowering glumes 

 close together or little distant, hardened 

 as well as the palea round the grain as 

 in Panicum ... ... ... ... 79. Isachne. 



Rhachis of the spikelet hairy round the flowering 

 glumes. 



Spikelets two-flowered. Outer glumes many- 

 nerved. Plowering glumes awned or 

 unawned ... ... ... ... 81. Eriachne. 



Subtribe IV. — Festucaceas. — Spikelets several — often many-flowered in 

 a loose or narrow and dense panicle or capitate, the rhachis of the spikelet 

 usually produced beyond the last flower or ending in an empty glume. 

 Outer glumes usually narrow, acute or rarely obtuse, unawned. Plowering 

 glumes entire or slightly notched, obtuse, acute or the keel or midrib 

 produced into a point or straight awn. 



Group i. Several empty awned glumes above one or two flowering ones. 



Spikelets in a narrow and dense or loose and spreading 



panicle ... ... ... ... ... 82. Ectrosia. 



Group ii. Only one empty glume above the flowering ones, sometimes 

 rudimentary or deficient. 



