19 Jour., Bom. Nat. Hist. Soc, Vol. XXXI V, No. 1 [March 1, 1930. 



muero and the margins inrolled all 

 along. 



* Fruiting flowering glume acute, 



not mucronate ; spikelets solit- 

 ary, closely biseriate, contiguous 

 with their sides ; false spikes 

 rigid, hot several times longer 

 than the internodes of the long 

 common axis ; their lower parts 

 more or less appressed to the 

 alternately hollowed out flanges 

 of the latter (vol. 32, 641) ... 49. Paspalidium. 

 ** Fruiting flowering glume obtuse, 

 abruptly mucronate or aristu 

 late ; spikelets solitary or paired, 

 when solitary contiguous with 

 their backs ; false spikes often 

 flexuous or curved, usually 

 several times longer than the 

 internodes of the relatively short 

 common axis, spreading from 

 the base (vol. 32, 642) ... 50. Urochloa. 



(ii) Glumes caudate-or cuspidate-acumi- 

 nate or awned. 



* Glumes awned from the entire 



acute or acuminate tip, or cau- 

 date or cuspidate-acuminate ; 

 margins of the fruiting flowering 

 glume flat upwards, not em- 

 bracing the tip of the pale ; 

 racemes dense, more or less 

 secund, often very numerous 

 (vol. 32, 645) ... ... 51. Echinochloa. 



** Glumes awned from the slightly 

 notched tips ; racemes elong- 

 ated or short to very short, 

 secund, compact, spreading 

 from the common axis (vol. 33, 



8) ... ... ... 52. Ofolismenus. 



ii. Inflorescence an open panicle, rarely con- 

 tracted, cylindrical and spike-like (Sacci- 



olepis, Setaria sp.) (Genera 53-57). 

 (a) Spikelets not supported by bristle-like 

 branches (Genera 53-56). 



a. Spikelets not gibbous or, if slightly 



so, then not in cylindrical false 

 spikes (Genera 53-55). 

 (*') Branches of panicle not adnate to the 

 main axis. 



* Panicle much contracted, dense, 



very compound, with erect nar- 

 rowly lanceolate spikelets ; lower 

 floral glume beaked, upper floral 

 glume rather thin (vol. 33, 15)... 53. Hymenachne, 

 ** Panicle usually open ; lower floral 

 glume not beaked, upper floral 

 glume crustaceous (vol. 33, 



9) ... ... ... 54. Panicum. 



(ii) Branches of panicles more or less 



adnate to the main axis so that 

 the pedicels appear to spring more 

 or less directly from the axis (vol. 

 33, 17) ... ... ... 55. Sacciolepis. 



b. Spikelets distinctly gibbous, laterally 



much compressed (vol. 33, 16) ... 56. Cyrtococcum. 



W 



