60 



27. Panicles wholly or partially inclosed within the subtending 

 leaf sheath, very rarely exserted 28 



27. Panicles exserted; plants robust 29 



28. Spikelets densely crowded in ovoid, or oblong spike-like pani- 



cles 46. Heleochloa 



28. Spikelets not densely crowded; panicles very narrow, simple 



and reduced to a few spikelets, or much elongated and many- 

 flowered 51. Sporobolus 



29. Inflorescence an elongated, wand-like or spike-like panicle; 



empty glumes subequal, convex on the back; flowering 



glumes 3-nerved; callus naked 53. Epicampes 



29. Inflorescence a loose or expanded panicle; empty glumes 

 unequal, compressed; flowering glumes 1-nerved; callus 

 hairy 62. Calamovilfa 



