Class III. Order II. 



cd ; the valves acute ; corolla two valved, unequal, 

 larger than the calyx. 



30. CINNA. Calyx two valved, one flowered ; 

 corolla linear, naked at base ; stamen one. 



31. LEERS i A. Calyx none ; corolla two valved, 

 closed. 



32. PHALARIS. Calyx two valved, the valves 

 carinate, equal ; corolla two valved, included, hairy 

 at base. Rudiments resembling valves. 



33. ARISTIDA. Calyx two valved, corolla one 

 valved with three terminal awns. 



34. STIPA. Calyx two valved ; corolla two valv- 

 ed, the valves involute, truncate ; awn terminal, very 

 long, twisted at base. 



B. Flowers more than one in each calyx. 



35. AIRA. Calyx two valved, two or three flow- 

 ered without the rudiment of an additional flower ; 

 corolla two valved. 



36. UNIOLA. Calyx many valved; spikelet ovate, 

 carinate. 



37. DACTYLIS. Calyx of two valves, many flow- 

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

 carinate. 



38. AVENA. Calyx two valved, many flowered, 

 with a twisted awn on the back. 



39. POA. Calyx tw T o valved ; spikelet rounded 

 at the base ; corolla two valved, the valves ovate, 

 somewhat acute, awnless. 



40. BRIZA. Calyx tAvo valved; corolla inflated, 

 its valves heart-shaped, mostly obtuse. 



41. FESTUCA. Calyx two valved; spikelet ob- 

 long, roundish, with pointed glumes. 



