DESCRIPTIONS OF TRIBES AND GENERA. 143 



of which are united into a raceme or form a 



capitate inflorescence 250. JEluropus. 



CO. Spikelets in small fascicles which are united into a 

 glomerate or interrupted panicle. 



aa. Panicles one-sided 252. Dactylis. 



bb. Panicles symmetrical. . . . 251. Lasiochloa. 

 DD. Spikelets in panicles or racemes, neither imbricated nor 

 in fascicles. 



aa. Branches of the panicles in at least twelve- 

 rayed false whorls, the lowest of which is 



sterile 257. Nephelochloa. 



NOTE. Compare Poa, Sec. A. 

 bb. Branches of the panicles in whorls of 1-5. 



aa. Stigmas two, inserted at or near the apex 

 of the ovary ; empty glumes awnless. 

 * Empty glumes longer than all the flow- 

 ering glumes, 

 t Flowering glumes two-cleft or two- 



lobed 256. Schismus. 



ft Flowering glumes entire, or finely 



toothed 260. Dupontia. 



** Flowering glumes, at least of the upper- 

 most flowers, projecting from the empty 

 glumes. 



t Lateral nerves of the floral glumes 

 nearly parallel, not converging. 

 O Empty glumes but little or not 

 at all shorter than the nearest 

 flowering glumes. 

 <3 Flowering glumes with two 

 very short, nearly obsolete, 

 nerves on each side. 



259. Colpodium. 



O O Flowering glumes with 3-4 

 nerves on each side, at least 

 one of which is prolonged be- 

 yond the point. 



261. Seolochloa. 



<I < Empty glumes much shorter 

 than the nearest flowering glume. 



