88. GRAMINE^E. 187 



8. AGROSTIS. Glumes awnless, outer one largest. Glumellas 

 membranous, very unequal, or the inner wanting, occasion- 

 ally with a small tuft of hairs at the base. Awn dorsal, 

 sometimes none. 



9. MILIUM. Glumes nearly equal, smooth on the keeJ, flattish 



on the back. Glumellas nearly as long as the glumes, awnless, 

 smooth, hard and shining when enclosing the mature fruit. 



10. MELICA. Glumes broad, with several nerves. Glumellas 

 awnless, smooth, outer one 7-ribbed. Sometimes 2-flowered. 



2. Spikelets with 2 perfect florets, 

 t Glumellas without awns. 



11. MOLINIA. Glumes shorter than the glumellas, acute, lowest 

 1 -nerved ; second floret on a bristle-like peduncle. 



12. CATABROSA. Glumes obtuse, shorter than the florets, outer 

 one very small. Glumellas truncate, margin scariose. 



13. KCELERIA. Panicle close, spike-like. Glumes unequal. Outer 

 glumella entire, acute, 3-ribbed. 



ft Glumellas awned. 



14. HOLOTJS. Glumes nearly equal. Glumellas enclosed within 

 the glumes. Lower floret with a long footstalk. 



15. AIRA. Glumes nearly equal. Glumellas hairy at the base, 

 outer one awned at the back, seldom protruding beyond the 

 glumes. 



16. ARRHENATHERUM. Glumes unequal. Lower glumella with 

 a long twisted geniculated awn from near the base, with 

 stamens only ; glumella of the upper perfect floret with a 

 very short awn from a little beneath the summit. 



17. A VENA. Glumes membranous, many-ribbed. Glumellas 

 cartilaginous, hairy at the base, outer one awned from a 

 little beneath the centre. Awn twisted at the base and 

 bent. Sometimes 3-flowered. 



18. SESLERIA. Glumes nearly equal, outer one with a very short 

 awn from the summit. Outer glumella with 3 5 teeth, 

 middle one bristle-like and rough. Often more than 

 2-flowered. 



3. Spikelets with 3 4 perfect florets. 



19. CYNOSURTJS. Inflorescence a unilateral spike-like raceme, 

 with a pectinated bract at the base of each spikelet. 



20. DACTYLTJS. Panicle in several dense, subsecund tufts. 

 Glumes unequal, hairy. Glumella with a minute awn from 

 below the summit, ciliate on the back. 



21. PHRAGMITES. Panicle large and spreading. Florets enve- 

 loped in long silky hairs. Inner glumella half the length 

 of the outer. 



22. TRIODIA. Glumes and glumellas nearly equal, the latter 

 hairy at the base, awnless, outer glumella 3-toothed. 



