9 



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

 ne;e. It contains twenty-two genera with over six hun- 

 dred and thirty species. Panicwn, the i^rincipal genus, 

 is the hirgest among grasses, numbering three hundred 

 species. The Panicew are very widely distributed 

 throughout the tropical and temj)erate regions of the 

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

 known examples of this tribe. 



Eeimaria Fliigge.* Oplismenus Beauv. 



Paspalum Linu." Ch;etochloa Scribn.* 

 Antha>nantia I3eauv. {Seiaria Auct.) 



Amphicarpou Kaf. ^ Cenchrus Liun.* 



Eriochloa Kunth.* Pennisetum Pers.* 



Panicum Linn.* Stenotaphruni Triu.* 



Tribe VI. — Oryzece. 



Spikelets usually much compressed laterally, one-flowered, 

 stamiiiate, pistillate, or liermapbrodite ; 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 

 glnme; 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 Linn. 



Pharus Linn. . Oryza Linn. 



Luziola Juss.* Homalocencbrus Mieg.* 



Zizaniopsis Doell and Asch. {Leersia Sw.) 



Series B. — Poace^. 



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

 mentary flower, if any, usually uppermost; rachilla 



