CLASS III. ORDER II. jg 



39. Uniola. Calyx many valved ; spikelet ovate, 

 carinate. 



40. Dactylis. Calyx of two valves, many flow- 

 ered, one of the valves larger, longer, compressed, 

 carinate. 



41. AvENA. Calyx two valved, many flowered, 

 with a twisted awn on the back. 



42. PoA. Calyx two valved ; spikelet rounded at 

 the base ; corolla two valved, the valves ovate, some- 

 what acute, awnless. 



43. Briza. Calyx two valved; corolla inflated, its 

 valves heart-shaped, mostly obtuse. 



44. Festuca. Calyx two valved ; spikelet oblong, 

 roundish, with pointed glumes. 



45. Bromus. Calyx tv/o valved ; spikelet oblong, 

 roundish, two ranked ; awn from below the top of 

 the valves. 



46. Arundo. Calyx two valved ; corolla woolly at 

 the base, awnless. 



C. Floiuers polygamous. 



47. Panicum. Calyx of tv/o very unequal valves, 

 containing two flowers, the outer one barren ; corolla 

 cartilaginous, investing the seed. 



48. Andropogon. Flowers double ; one pedicelled, 

 barren ; the other sessile, containing two florets, one 

 barren, the other perfect, its corolla furnished with a 

 twisted awn. 



49. HoLcus. Calyx two valved, two or three flow- 

 ered; corolla two valved, barren floret mostly awned. 



D. Flowers spiked on a long slender receptacle. 



50. LoLiuM. Calyx one valved, many flowered. 



51. Triticum. Calyx two valved, many flowered. 



