8 



Tribe III. — Zoysieiv. 



Spikelets solitary or iu groups of two to eight, each group fall- 

 ing as a whole from the continuous rachis, usually one-flowered, 

 hermaphrodite, or staminate and hermaphrodite iu the same 

 group; flowering glume less firm iu texture than the awned or 

 awnless outer ones, which are herbaceous, chartaceous, or coria- 

 ceous ; the first glume is usually larger than the second. 



A small tribe, numbering about twenty-five species 

 whicli represent nearly half that number of genera. 

 Fifteen species are natives of the tropical and warmer 

 temperate regions of America. Black grama, or Qal- 

 leta, as the Mexicans name it, species of Hilarla^ are 

 our best-known representatives of the tribe. 



Hilaria Kunth.* Nazia Adans. {Tragus llaW). 



^gopogon HBK. Zoysia Willd. 



Tribe IV. — Tristeginece,. 



Spikelets all hermaphrodite, iu panicles ; empty glumes three, 

 or the third with a staminate flower in its axil, herbaceous or 

 chartaceous; flowering glumes membranaceous, awned or awn- 

 less; rachilla articulated below the empty glumes. 



A small tribe of only seven genera and thirty-three 

 species, natives chiefly of the tropical regions of the 

 Old World. Of the few American species none extend 

 so far north as the United States. 



Tribk V. — Panicew. 



Spikelets hermaphrodite, terete or flattened on the back ; glumes 

 three or four (rarely only two) ; when four there is occasionally a 

 staminate flower or a palea iu the axil of the third; tbe upper- 

 most or flowering glume of the hermai)hrodite flower is always 

 firmer in texture than tbe outer glumes, of which tlie first is 

 usually smaller than the others; axis of the inflorescence not 

 articulated, the rachilla being articulated below the emptj' 

 glumes, the spikelets falling oif singly from their pedicels. 



