14 Class III. Order III. 



42. BROMUS. Calyx two valved ; spikelet ob- 

 long, roundish, two ranked ; awn from below the 

 top of the valves. 



43. ARUNDO. Calyx two valved ; corolla woolly 

 at the base, awnless. 



C. Flowers polygamous. 



44. PANICUM. Calyx of two very unequal valves, 

 containing two flowers, the outer one barren ; corol- 

 la cartilaginous, investing the seed. 



45. ANDROPOGON. Flowers double ; one pedi- 

 celled, barren ; the other sessile, containing two flo- 

 rets, one barren, the other perfect, its corolla fur- 

 nished with a twisted awn. 



46. HOLCUS. Calyx two valved, two or three 

 flowered ; corolla two valved, barren floret mostly 

 awned. 



D. Flowers spiked on a long slender receptacle. 



47. LOLIUM. Calyx one valved, many flowered. 



48. TRITICUM. Calyx two valved, many flow- 

 ered. 



49. ELYMUS. Involucre four leaved, two flow- 

 ered ; flowers compound. 



50. HORDEUM. Involucre six leaved, three flow- 

 ered ; flowers simple. 



Order III. TRIGYNIA. Three styles. 

 A. Flowers inferior. 



51. LECHEA. Corolla three petalled ; calyx three 

 leaved ; capsule three celled, three valved. 



52. MOLLUGO. Corolla none ; calyx five leaved : 

 capsule three celled. 



