9 



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

 nea\ 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 Panicece 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 Fliigge.* Oplismenus Beauv. 



Paspaluru Linn." Ctuctochloa Scribn.* 

 Anth;enantia Beauv. (Setaria Auct. ) 



Ainphicarpou Raf.* Cenchrus Linn.* 



Eriochloa Knnth.* Pennisetum Pers. * 



Panicuui Linn.* Stenotaphruin Trin." 



Tribe VI. Oryzeas. 



Spikelets usually much compressed laterally, cme-fl owerecl , 

 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 

 i;lume; 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 Jusa.* Homalocencbrus Mieg,* 



Zizaniopsis Doell and Ascli. {Lcersia Sw.) 



Series B. Poace^e. 



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

 mentary flower, if any, usually uppermost; rachilla 



