88 



4. Spikelets 2-flowered, the first, or lower flower, staminate, its 

 glume long-awned; the second hermaphrodite and usually 

 awnless 71. Arrhenatherum 



4. Spikelets 2-to several-flowered, flowers all hermaphrodite or the 



uppermost imperfect 5 



5. Awns articulated near the middle, the upper portion club- 



shaped 67. WeingyERTNeria 



5. Awns not articulated, tapering to a point 6 



6. Spikelets large, .1 centimeter (J in.) or more in length; grain 



adherent to the glumes or palea, sulcate, hairy, at least at 

 the apex. (Flowering glumes awnless in some cultivated 

 forms) 70. A vena 



6. Spikelets less than 1 centimeter long; grain free from the glumes, 



not sulcate 7 



7. Apex of the flowering glumes finely erose-dentate, 2-lobed or 



entire at the apex, rounded on the back, awned from below 



the middle 68. Deschampsi a 



7. Apex of the keeled flowering glumes 2-toothed, the teeth usually 

 awn-like; awns arising from above the middle. {Grapl^ho- 

 rum melicoideum, may be looked for here.) 69. Trisetum 



