Class in. Order III. li 



long, roundish, two ranked ; awn from below the 

 top of the valves. 



33. ARUNDO. Calyx two valved ; corolla wool- 

 ly at the base, awnless. 



C. Flowers sfiiked on a long slender recejitacle. 



33. LOLIUM. Calyx one valved, many flowered. 

 31. TRITICUM. Calyx two valved, many flow- 

 ered. 



35. ELYMUS. Involucre four leaved, two flow- 

 ered ; flower compound. 



36. HORDEUM. Involucre six leaved, three 

 flowered ; flowers simple. 



Order IU. TRIGYJTIA. Three styles. 



A. Flowers inferior. 



37. LECHEA. Corolla three petalled ; calyx 

 three leaved ; capsule three celled, three valved. 



38. MOLLUGO. Corolla none ; calyx five leav- 

 ed ; capsule three celled. 



B. Flowers superior. 



39. PROSERPINACA. Corolla none; calyx three 

 parted ; seed one, three celled. 



