60 TEIANDKIA. [cL. III. 



them bearing stamens only, and awned. Husks two, awned. 

 Seed invested 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 per- 

 manently membranous. Seed loose. Styles distinct. 



27. SESLEHIA. Chaff-scales two, acute, somewhat awned. 

 Flowers two or three, all perfect. Husks toothed or awned. 

 Seed loose. Styles combined. 



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

 than two flowers. 



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



awnless. 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, awn- 

 less. 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. DACTYLIS. 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. Hu$ks two, unequal, the outer nearly cylindrical, 

 pointed or awned. Seed oblong, loose. 



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

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

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



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



awnless. 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, 



awnless. 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, 

 awnless. Htisks two, unequal, surrounded by long hairs. Seed 

 oblong, loose, but enveloped in the husks. 



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

 lateral excavations. 



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



the excavation, many-flowered. 



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



posite to the excavation, two-flowered. 

 44. TRITICUM. Chaff-scales two, at each joint of the stalk, oblong, 



