SYNOPSIS OP THE GENERA, 



43, Cynosu'hus, [Page 145.] Panicle spikcL], Spikclcls two or 



many-flowered, fixed upon pectinate bractcec. Glumes two, 

 equal. Glumellcs two, nearly equal, the outer pointed or 

 awped at the apex, 



44, Arun'do, [Page 147.] Panicle loose. Spikelets many-flower- 



ed ; the lower floret bearing stamens only, and naked ; the 

 ujiper perfect, and surrounded by a tuft of hairs. Glumes 

 two, unequal, shorter than the floiets. Glumelles two, 

 unequal, 



* *^ Floivers spiked, Spikelets sessile, upon a common stalk or 



rachis. 



f Spikelets inserted on all sides. 



45. Ely'mus, [149.] Injlorescence sinkcd, Spikelets two or three 



from the same point, two or three-flowered. Glumes two, 

 both on one side of the spikelet, Glumelles two, nearly 

 equal. 



46, Hor'deum, [Page 150.] Inflorescence spiked. Spikelets sin- 



gle-flowered, three together, the lateral ones mostly imper- 

 fect. Glumes two, lateral, Glumelles two, the outer valve 

 awned. Fruit closely invested with the glumelles. 



47. Trit'icum, [Page 154.] Inflorescence spiked. Spikelets 



many-flowered, all fertile. Glumes two, nearly equal, 

 placed transversely, tlie sides directed to the rachis. Glu- 

 melles two, lanceolate ; the external one mostly atoned at 

 the aj)ex. 



48. BRACHT'roniUM, [Page 160.] Inflorescence somewhat race- 



mose. Spikelets alternate, somewhat compressed, many- 

 flowered; .footstalks short. Glumes unequal, transverse. 

 Ghimclles two, the outer valve mostly awned at the ex- 

 tremity. 



40. Lo'ltum, [Page 162.] Inflorescence a t\vo-SK\cds\nkc. Spike- 

 lets alternate, compressed, many-flowered. Glvma a single 

 valve. Glumelles two, nearly equal ; the outer valve awur 

 less, or with an awn below the npcx. 



50. RoTTBOLLiA, [Page 165.] Inflorescence a two-sided spike. 

 Spikelets alleruato, one or two-flowcrod. Glumes of two 

 valves, sometimes single, lateral, Glumelles two, awnless, 

 imbedded in the notches of the rachis, 



61, Knap'i'ia. [Page 166,] Inflorescence racemose, simple, 

 Glumes two, tnmcateJ, nearly ecpial, awnless. Glumelles 

 two, equal, obtuse, awnless, hairy. 



