9 



This is one of the largest tribes in the order Granii- 

 neae. It contains twenty-two genera with over six hun- 

 dred and thirty species. Panicum, the principal genus, 

 is the largest among grasses, numbering three hundred 

 species. The Pariicece are very widely distributed 

 throughout the tropical and temperate regions of the 

 world. Crab- grass and the millets are among our best 

 known examples of this tribe. 



Reimaria Fltigge.* Oplismenus Beau v. 



Paspalum Linn.* CLuetochloa Scribn.* 

 Anthamantia Beauv. (Setaria Auct.) 



Amphicarpon Raf.* Cenchrus Linn.* 



Eriochloa Kunth.* Pennisetum Pers.* 



Panicum Linn.* Stenotaphrum Trin.* 



Tribp: VI. — Oryzece. 



Spikelets usually much compressed laterally, one-flowered, 

 staminate, pistillate, or hermaphrodite; empty glumes two or 

 none, the flower being subtended by the floral glume and palea 

 alone, the latter one-nerved and regarded by some as a second 

 glume ; stamens frequently six ; axis of the inflorescence not artic- 

 ulated. 



A small tribe of about forty species divided among 

 sixteen genera, mostly confined to tropical America. 

 One of the best known and most extensively used of 

 the cereals, rice (Oryza sativa), belongs here. 



Hydrochloa Beauv. Zizania Liun. 



Pharus Linn. Oryza Liun. 



Luziola Juss.* Homalocenchrus Mieg.* 



Zizaniopsis Doell and Asch. (Leersia Sw.) 



Series B. — Poace.i:. 



Spikelets one- to many-flowered, the imperfect or rudi- 

 mentary flower, if any, usually uppermost; rachilla 



