Tribe III. — Zoysiece. 



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 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 Hilar i a, are 

 our best-known representatives of the tribe. 



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



iEgopogon 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, 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. 



Tribe V. — Panicea-. 



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 in the axil of the third; the upper- 

 most or flowering glume of the hermaphrodite flower is always 

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

 u^iu'il'y 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. 



