8 



Tribe III. Zoysiew. 



Spikelets solitary or in 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 in texture than the awned or 

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

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



A small tribe, numbering about twenty-five species 

 which represent nearly half that number of genera. 

 Fifteen species are natives of the tropical and warmer 

 temperate regions of America. Black grama, or Gal- 

 leta, as the Mexicans name it, species of Hilaria, are 

 our best-known representatives of the tribe. 



Hilaria Kunth.* Nazia Adans. (Tragus Hall). 



^Egopogon 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 regious of the 

 Old World. Of the few American species none extend 

 so far north as the United States. 



Tribe V. Panicece. 



Spikelets hermaphrodite, terete or flattened on the back ; glumes 

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

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

 most or flowering glume of the hermaphrodite flower is always 

 firmer in texture than the outer glumes, of which the first is 

 usually smaller than the others; axis of the inflorescence not 

 articulated, the rachilla being articulated below the empty 

 glumes, the spikelets falling off singly from their pedicels. 



