TRIANDRIA. DIGYNIA. 73 



b. Corolla with I or 2 abortive rudiments of Jlorets 

 at the base, 



1. Glumes and corolla of dissimilar texture, 



18. CYNODON. 19. GTMNOPOGON. 



2. Glumes and corolla of neurit/ similar texture,. 



20. PHALARIS. 21. ANTHOXANTHUM. 



22. BRACHYELYTRUM, 



ft. Spikelels many-flowered. 

 * Florets all perfect, 

 a. Panicled. 



1. Corolla unarmed, 



23. PHRAGMITES. 25. UNIOLA. 



24. GLYCERIA. 26. BRIZA. 



27. POA. 



2. Corolla more or less setigerous or mucronate, 

 «. Seed free, 



28. AIRA, 29. URALEPIS. 



30. TRICUSPIS. 



|S. Seed adnate, 



31. FESTUCA. 33. DIARRHENA. 



32. CERATOCHLOA. 34. DACTYLIS. 



3. C^orolla more or less bifida armed between the 



divisions a litth below the tip, 



35. DANTHONIA. 36. TRISETUM. 



37. BROMUS. 



4. Inferior valve of the corolla awned on the 



back, 



38. ARRHENATHERUM. 39. AVENA. 



b. Spiked, 



1. Calyx I'Valved, 



40. LOLIUM. 



2. Calyx 2-vaIved, 



41.ELEUSINE. 43. AGROPYRUM, 



42. TRITICUM. 44. SECALE. 



45. ELYMUS. 



** Terminal florets abortive, or mere rudiments. 



46. MELICA, 47. ATHEROPOGON, 



10 



