60 TKIANDRIA. [CL. III. 



bearing stamens only, and awned. Husks two, awned. Seed in- 

 vested by the hardened husks. 



22. PA'NICUM. Chaff-scales two, very unequal. Flowers two, one 

 of them destitute of stamens and style, the perfect one awnless. 

 Husks two. Seed invested by the hardened husks. 



28. HIERO'CHLOE. Chaff-scales two, unequal, acute, awnless. 



Flowers three, the central one perfect, with two stamens, the lateral 

 ones bearing three stamens, but no pistil. Husks permanently 

 membranous. Seed loose. Styles distinct. 



27. SESLE'RIA. Chaff-scales two, acute, somewhat awned. Flowers 

 two or three, all perfect. Husks toothed or awned. Seed loose. 

 Styles combined. 



*** Flowert in panicles. Calyx of two chaff-scales, containing 

 more than two flowers. 



32. BRI'ZA. Chaff-scales two, nearly equal, heart-shaped, obtuse, awn- 



less. Husks two, unequal, awnless. Seed united to the husks. 



30. PO'A. Chaff-scales two, unequal, egg-shaped, acute, awnless. 



Husks two, unequal, the outer keeled, egg-shaped, acute, awnless. 

 Seed loose, oblong. 



29. GLYCE'RIA. Chaff-scales two, unequal, oblong, obtuse, awnless. 



Husks two, unequal, the outer ribbed, cylindrical, abrupt, awnless. 

 Seed loose, cylindrical. 



31. TRIO'DIA. Chaff-scales two, nearly equal, egg-shaped, acute, 



awnless. Husks two, unequal, egg-shaped; the outer deeply cleft, 

 with an intermediate point. Seed oval. 



33. DAC'TYLIS. Chaff-scales two, unequal, lance-shaped, long- 



pointed, the larger keeled. Husks two, lance-shaped, the outer 

 keeled, and awned at the summit. 



36. FESTU'CA. Chaff-scales two, very unequal, lance-shaped, pointed. 



Husks two, unequal, the outer nearly cylindrical, pointed or awned. 

 Seed oblong, loose. 



35. CYNOSU'RUS. Chaff-scalet two, equal, lance-shaped, long- 

 pointed, awned. Htaks two, unequal, the outer lance-shaped, 

 keeled, awned at the summit. Seed oblong, loose. 



37. BRO'MUS. Chaff-scales two, unequal, lance-shaped, acute, awn- 



less. Husks two, unequal ; the outer elliptical, cleft, awned near 

 the summit. Seed elliptical, united to the inner husk. 



39. AVE'NA. Chaff-scales two, unequal, broadly lance-shaped, awn- 



less. Husks two, unequal ; outer nearly cylindrical, pointed, deeply 

 cleft, with a long twisted awn from the middle. Seed elliptical, 

 united to the outer hardened husk. 



24. ARU'NDO. Chaff-scales two, unequal, lance-shaped, keeled, awn- 

 less. Husks two, unequal, surrounded by long hairs. Seed oblong, 

 loose, but enveloped in the husks. 



**** Planters spiked ; arranged on a common stalk, having alternate 

 lateral excavations. 



40. LO'LIUM. Chaff-scale one, lance-shaped, fixed, opposite to the 



excavation, many-flowered. 



41. ROTTBO'LLIA. Chaff-scales two, lance-shaped, parallel, oppo- 



site to the excavation, two-flowered. 

 44. TRI'TICUM. Chaff-scales two, at each joint of the stalk, oblong, 



