gkamine^. 939 



{Only 2 nearly equal empty glumes enclosing the flower 9 

 An additional small empty glume outside the 2 equal ones 3. Panicum. 

 Two additional small, awned, empty glumes, withinside the 2 equal 

 ones 5. Anthoxanth. 



r Outer glumes swollen and shining at the base. Spikelets rather small. 



9S 14. NlTGEASS. 



I Outer glumes keeled or boat-shaped 10 



r-A. tuft of hairs at the base of the flower, within the outer glumes. Eeed- 



• j like grass with a very long spike 15. Maeam. 



] No tuft of hairs outside the flower within the outer glumes. Spikelets 



L flat 11 



f Flowering glume with a fine awn on its back (sometimes shorter than 



11 < the outer glume). No inner palea 9. Foxtail. 



I Flowering glumes without awns. Inner palea present 12 



-. 2 J* Keel of the outer glumes expanded into a flat wing ... 6. Phalaeis. 



I Keel of the outer glumes not winged 8. Phleum. 



f Spikelets 3 together on each tooth of the simple, close, cylindrical 

 spike, 1 or 2 of each cluster reduced to a pair of empty glumes. 



13 -j 26. Baeley. 

 I Spikelets small and numerous, in a close spike-like panicle, all con- 

 L taining flowers , 14 



- - J Flowering glumes without awns 8. Phlettm. 



1 Flowering glumes awned as well as the outer ones 15 



, K J Spike ovate, with softly silky hairs 11. Haee's-tail. 



I Spike cylindrical or branched, not hairy 12. Beaedgeass. 



SjpiJcelets 1-Jloivered, in a loose panicle. 



.. fi f Spikelets ovate, obtuse or scarcely acute 17 



I Spikelets lanceolate, pointed 19 



rSpikelets very flat, consisting of only 2 glumes, both keeled 1. Leeesia. 



17 A Spikelets scarcely flattened. Two outer empty glumes about the size 



L of the flowering one 18 



f Spikelets rather large, containing within the outer glumes, besides the 

 flower, a small, wedge-shaped, terminal glume or rudimentary 



18 <{ flower 38. Melicz. 



| Spikelets small, containing nothing besides the flower within the outer 



L glumes 2. Milium. 



{Small tufts of hairs or hairy appendages at the base of the flower within 

 the outer glumes 20 

 No hairs or hairy appendage at the base of the flower within the 

 outer glumes 21 



{No awns. A small hairy appendage at the base of the flower on each 

 side 7. Digeaphis. 

 Flowering glume with a short fine awn. A tuft of hairs at the base of 

 the flower 16. Smalleeed. 



2 l 2 



