154 BULLETIN 772, U. S. DEPARTMENT OF AGRICULTURE. 



Crypsie acufoafa. (L.) Ait. (fig. 88) has been introduced in a few 

 places in California. 



72. HELEOCHLOA Host. 



Spikelets 1 -flowered, the rachilla disarticulating above the glumes; 

 glumes about equal, narrow, acute; lemma broader, thin, a little 

 longer than the glumes ; palea nearly as long as the lemma, 2-nerved, 

 readily splitting between the nerves ; caryopsis free from the lemma 

 and palea. 



Low perennial spreading grasses, with oblong, dense, spikelike 

 panicles, terminal and on short lateral branches, the subtending leaves 



FIG. 88. Crypsis aculeata. Plant, X I ; spikelct and floret, the palea splitting, X 5. 



with inflated sheaths and reduced blades. Species about seven, in 

 the Mediterranean region, one introduced into the United States. 



Type species : Heleochloa alopecuroides Host. 



Heleochloa Host, Gram. Austr. 1: 23. 1801. Two species are described, 

 H. alopecuroicles and H. schoenoidcx, both of which are figured. The first is 

 chosen as the type. 



Heleochloa schoenoides (L.) Host (fig. 89) has been introduced 

 into the eastern United States at several points from Massachusetts 

 and Delaware to Illinois. 



73. BBACHYEJLYTBUM Beauv. 



Spikelets 1 -flowered, the rachilla disarticulating above the glumes, 

 prolonged behind the palea as a slender naked bristle; glumes very 

 short, unequal, the first sometimes obsolete, the second sometimes 

 awned ; lemma firm, narrow, 5-nerved, the base extending into a pro- 



