8 



Tribe III. — Zoijsmv. 



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

 ing as a whole from the continuous rachis, usually oiie-tlowered, 

 hermaijhrodite, or stamiuate 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 Hilaria^ are 



our best-known representatives of the tribe. 



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



:iEgopogon HBK. Zoysiu Willd. 



Tribe IV. — Tristegiiiea'. 



Spikelets all hermaphrodite, in panicles ; empty glumes three, 

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

 chartaceous; flowering gluiues membranaceous, awned or awn- 

 less; lachilla articulated below the empty glumes. 



A small tribe of only seven genera aud 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. 



Tribf. y. — Paniced'. 



Spikelets hermaphrodite, terete or flattened on tb« b-itk ; glumes 

 three or four (rarely only two) ; when four tl -'lally a 



staniinate flower or a palea in the axil of the ti..i.u, v. per- 



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

 firmer in texture than tbe 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. 



