DESCRIPTIONS OF TRIBES AND GENERA. 163 



254. (221) Lamarckia Monch. (Chrysurus Pers., Pte- 

 rium Desv., Tincea Garzia). A low annual grass, with an 

 elegant, one-sided, crowded panicle whose branches are 

 terminated by the fertile spikelets, which are entirely 

 covered up by the long awns of the sterile ones. 



Species one (L. aurea Monch), in the regions of the 

 Mediterranean to Afghanistan. Introduced in North 

 America (California). A favorite ornamental grass 

 (" Chrysurus cynosuroides"). 



255. (252) Sclerochloa Beauv. A prostrate, annual 

 grass with short, one-sided, rigid panicles ; joints of the 

 rachilla much thickened ; glumes narrow, very obtuse. 



Species one (S. dura Beauv.), in southern and central 

 Europe, western and central Asia. 



256. (254) Schismus Beauv. (Electra Panzer, Hemisacris 

 Steud.). Low, annual grasses with somewhat dense 

 panicles. Large, somewhat acute, white, membrana- 

 ceous-margined empty glumes ; and small, membrana- 

 ceous, 5-9-nerved flowering glumes. 



Species four, two South African, two from the Medi- 

 terranean to Afghanistan. 



257. (255) Nephelochloa Boiss. Panicles very delicate ; 

 spikelets very small ; flowering glumes with a straight 

 awn projecting from the two-toothed point. 



Species one {N. orientalis Boiss.), in the Orient. 



258. (256) Poa L. Spikelets 2-6-flowered, usually in 

 open, rarely in spike-like panicles ; rachilla and callus, 

 as well as the marginal nerves of the flowering glumes, 

 often clothed with tangled hairs ; glumes herbaceous or 

 membranaceous, awnless ; flowering glumes often obtuse. 



Species about one hundred, distributed throughout 

 all temperate and cold countries ; a few in the high 

 mountains of the tropics ; some cosmopolitan. 



Sec. I. Pseudopoa. Habit of the preceding genus. 

 Fruit grown to the glumes, slightly furrowed. 



Species three, P. Persica Trin. in Asia Minor and 

 Persia. 



Sec. II. Eupoa. Fruit unfurrowed, mostly free. This 

 section comprises some of the most important fodder- 



