8 



Tribe IIT. — Zoyslen . 



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 in the same 

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

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

 ceous: the first iilume 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). 



JEgopogon HBK. Zoysia Willd. 



Tribe IV. — Tristeginece. 



spikelets all hermaphrodite, in panicles : empty glumes three, 

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

 chartaceous: flowering glumes membranaceous, awued 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 tbe few American species none extend 

 so far north as the United States. 



Tribe V. — Paniceir. 



Spikelets hermaphrodite, terete or flattened on the back ; glumes 

 three or four (rarely only two I ; when 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 I >eirj <j; articulated below the empty 

 glumes, the spikelets falling off singly from their pedicels. 



