12 Class III. Order II. 



18. CYPERUS. Corolla none ; calyx of chaffy 

 scales imbricate two ways ; seed mostly naked. 



19. SCIRPUS. Corolla none; calyx of chaffy 

 scales imbricate every way ; seed mostly naked. 



20. ERIOPHORUM. Corolla none ; calyx of im- 

 bricate scales ; seed invested with long woolly hair. 



21. SPARTINA. Calyx two valved, compressed, 

 one valve larger, longer, and carinated ; corolla two 

 valved. 



22. ORYZOPSIS. Calyx two valved, the valves 

 obovate, one flowered ; corolla two valved, the outer 

 one awned ; nectary two leaved. 



Order II. DIGYNM. Two styles.. 

 A. Flowers scattered^ one in each calyx. 



23. M ILIUM. Calyx t\vo valved, the valves ven- 

 tricose, nearly equal ; corolla two valved, mostly 

 shorter than the calyx. 



24. ALOPECURUS. Calyx two valved, one flow- 

 ered ; corolla one valved ; flowers spiked. 



25. TRICHODIUM. Calyx two valved, one flow- 

 ered ; corolla one valved, awnless ; flowers panicled. 



26. MUHLENBERGIA. Calyx minute, one valved; 

 corolla two valved, hairy at base, outer valved awn- 

 cd at the tip. 



27. ANTHOXANTHU-M. Calyx two valved ; corol- 

 la two valved, acuminate, awned"; stamens two. 



28. PHLEUM. Calyx two valved, one flowered, 

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

 and longer than the corolla. 



29. AGROSTIS. Calyx two valved, one flower- 



