12 TKIANDRIA. 



* * * Flowers dispersed. Calyx containing many florets. 



32. BRIZA. Corolla awnless, tumid, expanded, concave, without 



a keel ; seed depressed, united to the corolla. 



30. POA. Corolla awnless, compressed, keeled, ovate, acute ; 



seed loose, elliptic- oblong. 



29. GLYCERIA. Corolla awnless, cylindrical, furrowed, ribbed, 

 abrupt, not keeled ; seed loose, cylindric-oblong. 



31. TRIODIA. Corolla orbicular, expanded, e-bscurely ribbed, 



deeply cloven with an intermediate point ; both valves 

 concave ; seed loose, depressed. 



33. DACTYL is. Corolla, awned at the summit, lanceolate, keeled, 



compressed, inner valve folded, 2-ribbed ; seed loose, ob- 

 long ; calyx compressedj taper-pointed, unequal. 



35. FJESTUCA. Corolla awned at the summit, or pointed, keeled, 



nearly cylindrical, concave, inner valve flat, 2-ribbed, 

 downy at the ribs; seed loose, oblong^ calyx concave^ 

 acute, very unequal. 



34. CYNOSURUS. Corolla awned at the summit, lanceolate^ 



keeled, concave, inner valve flat, 2-ribbed ; seed loose, el- 

 liptic-oblong ; calyx awned, equal ; spikelels in pairs, 1 en- 

 tirely neuter. 



36. BROMUS. Corolla awned at the back, cloven, concave, inner 



valve flat, 2-ribbed, bristly at the ribs; seed elliptic-ob- 

 long, united to the inner valve. 



37- A VENA. Corolla awned at the back, cloven, nearly cylindri- 

 cal, inner valve flat, ovate ; seed elliptic -oblong, united to 

 the hard outer valve. 



38. ARUNDO. Corolla surrounded with long permanent hairs ; 



florets 1 or many. 



* * * * Flowers aggregate, on a jointed or toothed common stalk with 

 lateral excavations. 



39. LOLIUM. Calyx of 1 principal valve opposite to the stalk, 



fixed, many-flowered. 



