14 CLASS III. ORDER II. 



cose, nearly equal ; corolla two valved, mostly shorter 

 than the calyx. 



27. Alopecurus. Calyx two valved, one flowered ; 

 corolla one valved ; flowers spiked. 



28. Trichodiuini. Calyx two valved, one flowered; 

 corolla one valved, awnless ; flowers panicled. 



29. MuHLENBERGiA. Calyx minute, one valved ; 

 corolla two valved, hairy at base, outer valved awned 

 at the tip. 



30. Anthoxanthum. Calyx two valved ; corolla 

 two valved, acuminate, awned; stamens two. 



31. Phleum. Calyx two valved, one flowered, 

 sessile, linear, truncate, ending in a point, inclosing, 

 and longer than the corolla. 



32. Agrostis. Calyx two valved, one flowered ; 

 the valves acute ; corolla two valved, unequal, larger 

 than the calyx. 



33. CiNNA. Calyx two valved, one flowered; co- 

 rolla linear, naked at base ; stamen one. 



34. Leersia. Calyx none ; corolla two valved, 

 closed. 



35. Phalaris. Calyx two valved, the valves cari- 

 nate, equal ; corolla two valved, included, hairy at 

 base. Rudiments resembling valves. 



36. Aristida. Calyx two valved, corolla one 

 valved with three terminal awns. 



37. Stipa. Calyx two valved ; corolla two valved, 

 the valves involute, truncate ; awn terminal, very 

 long, twisted at base. 



B. Flowers more than one in each calyx. 



38. Aira. Calyx two valved, two or three flow- 

 ered without the rudiment of an additional flower ; 

 corolla two valved. 



