444 POACE^. 



j. Floral glumes 1-3-nerved, flowers perfect, 

 or the upper one staminate or riulimen- 



tary (k)' 



k, Eays spirally arranged (1) 



1. Panicle narrow, spikelets small, 

 conical, 2-4-flowered, rachilla ar- 

 ticulate 110 



1. Panicle variable, spikelets not 

 conical, usually densely many- 

 flowered, rachilla usually continu- 

 ous Ill 



k. Eays distichous (m) 



m. Panicle narrow, s^iikelets 3-4- 

 flowered, emjity glumes much 

 longer than the floral. . . . 109 

 m. Empty glumes shorter or but lit- 

 tle longer than tlie floral glumes, (n) 

 n. Panicle narrow, spikelets 2-4- 

 flowered, second empty glume 

 broader and longer than the 

 floral glumes, whicli are 

 broadly obtuse, awnless. . . 112 

 n. Panicle spikelike, second 

 empty glume not broader or 

 longer than the floral glumes. 113 

 n. Panicle diff'use, spikelets 

 small, 2-4-flowered, empty 



glumes subequal 114 



j. Floral glumes 3-5- to many-nerved, with 

 two or more of the upper glumes empty 

 and closely enveloping each other, spike- 

 lets but little compressed (o) 



0. Stamens 3, lodicules 1, empty glumes 



usually clavate 115 



o. Stamens 1-2, lodicules 2, upper empty 

 fflumes not clavate llS 



