40 



** Fl. dispersed. Cal. of 2 valves, containing 2 or 3 

 Jiorets. 



39. AIRA. Florets 2, without any intermediate rudiment. 



Seed loose. Cor. unchanged. 



42. MELICA. Florets 1 or 2, with the rudiments of 1 



or 2 intermediate ones. Seed coated with the hard- 

 ened corolla. 



40. HOLCUS. One Jloret barren. Cor. awned. Seed 



coated with the hardened corolla. Cal. keeled. 



38. PANICUM. One Jloret neuter. Cor. of the perfect 

 one awnless. Seed coated with the hardened corolla. 

 Cal. ribbed. 



41. HIEROCHLOE. Florets 3; central one perfect, with 



2 stamens; lateral ones barren, with 3. Cor. perma- 

 nently membranous. Seed loose. Styles distinct. 



43. SESLER1A. Florets 2 or 3, all perfect. Outer valve 



of the cor. toothed ; inner cloven. Seed loose. Styles 

 combined. 



# # # jp/. dispersed. Cal. contai?ii?ig many Jiorets. 



47. BRIZA. Cor. awnless, tumid, expanded, concave, 



without a keel. Seed depressed, united to the corolla. 



45. POA. Cor. awnless, compressed, keeled, ovate, acute. 



Seed loose, elliptic-oblong. 



44. GLYCERIA. Cor. awnless, cylindrical, furrowed, 



ribbed, abrupt, not keeled. Seed loose, cylindric-ob- 

 long. 



46. TRIODIA. Cor. orbicular, expanded, obscurely 



ribbed, deeply cloven, with an intermediate point; 

 both valves concave. Seed loose, depressed. 



48. DACTYLIS. Cor. awned at the summit, lanceolate, 



keeled, compressed; inner valve folded, 2-ribbed. 

 Seed loose, oblong. Cal. compressed, taper-pointed, 

 unequal. 



51. FESTUCA. Cor. awned at the summit, or pointed, 

 keeled, nearly cylindrical, concave ; inner valve flat, 

 2-ribbed, downy at the ribs. Seed loose, oblong. 

 Cal. concave, acute, very unequal, 



