40 



** Fl. dispersed. Cat. of 2 valves, contahii7ig 2 or 3 

 Jlorets. 



39. AIR A. 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 foret barren. Cor. awned. Seed 



coated with the hardened corolla. Cal. keeled. 



38. PANICUM. One /orrf neuter. Cor. of the perfect 

 one awnless. Seed coated with the hardened corolla. 

 Cal. ribbed. 



H? 41. HIEROCLE. P/o;t/s 3 ; central one perfect, with 2 

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



nently membranous. Seed loose. Sii/les distinct. 



43. SESLERI A. Florets 2 or 3, all perfect. Outer valve 



of the cor. toothed ; inner cloven. Seed loose. Sij/les 

 combined, 



*** Fl. dispersed. Cal. containing many Jlorets. 



47. BRIZA. Cor. awnless, tmnid, 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. Cur. awnless, c\'lindrical, 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 tlie summit, or pointed, 

 kee'ed, nearly cj'lindrical, concave ; inner valve flat, 

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

 Cal, concave, acute, very unecjual. ^ 



