6 OLXziii. GBAMiNEJ;. (J. D. Hooker.) 



* Eaohilla not produced beyond gl. II. 



t Spikelets articulale on their pedicels, or gl. I and II separately deciduous, 

 or pedicel articulate in the middle. 

 Spikeleta oblong; gl. I and II 3-nerved, III 5-nerved, 



awnless . 67. Ctathopos. 



Spikelets very narrow; gl. I and II 3-nerved, III faintly 



1-3-nerved, usually awned 68. Gaenotia. 



Spikelets compressed ; gl. I and II subequal, awned, 



nerved 69. PoLYPOaON. 



Spikelets subglobose ; gl. I nerveless, II and III 1- 



nerved, awnless ... . . 70. Sph.ebocaeyum. 



ft Spikelets and pedicels inarlicidate, gl. I and II persistent. 

 Gls. all awnless ; I and II 1-nerved, pericarp of grain 



loose 71. SpoBOBOins. 



Gl. I and II subequal, 1. nerved, awnless, awn of III 



dorsal or 72. AaEOSTis. 



Gl. I and II unequal, awnless, 1-nerved, awn of III ter- 

 minal 73. MUEHLENBEBGTA. 



Gl. I and II 3-nerved, awnless, base of III penicillate 



■with long hairs ... .... 74. CALAMAffBOSTis. 



** Rachilla produced beyond gl. Ill usually peni- 

 cillate with long, silky hairs ; gl. I and II 3-nerved. . 75. Deteuxta. 



Tribe VII. Avesem. Spikelets 2- or more fid., panicled, very rarely 



spicate, or panicle sabspicit'orm ; fl. ffls. usually awned, awn genic-ulate 



and often twisted, rarely straigbt or ; rachilla produced or not beyond 



the upper fl. gl. 



Subtribe I. Aire^. Spikelets 2-fld. ; gls. membranous ; rachilla not 



produced. 



Gl. I acnts, many-nerved ; fl. gl. long-ciliate . . .76. Ebiachne. 



Spikelets minute ; rachilla and keel of fl. gl. ciliate . . 77. Zkhkeeia. 



Spikelets awnless ; gl. Ill largest 2-8exual, IV male . 78. Coelaohne. 



Spikelets 3-nate; gl. I and II awnless. III male, cleft, 



awned in the cleft 79. Teistachta. 



Gl. I and II awnless. III and IV bisexual, hyaline, dor- 

 sally awned . . . . ' . , . . 80. Aiba. 



Subtribe III. EuavenejE. Spikelets 2- or more fld. ; rachilla pro- 

 duced. 



Spikelets 2-fld., both bisexual, awned .... 81. Deschampsia. 

 Spikelets 2-fld., lower fl. bisexual awnless, upper male 



or neuter awned 81*. HoLCUS. 



Spikelets 2-6-fld. ; fl. gl. awned, awn subterminal or 



dorsal 82. Avena. 



Spikelets 3- or more-fld. ; fl. gl. deeply cleft, awned in 



the cleft 83. Danthonia. 



Tribe VIII. ChloridejE. Spikelets 1- or more-fld., 2-seriate (some- 

 times very distantly) and secund on an inarticulate spike or on the spici- 

 form branches of a slender panicle ; fl. all or the lower only bisexual ; 

 rachilla produced or not beyond the upper fl. gl. 



* Spike solitary, terminal (see also Chloris). 

 Spikelets minute, 1-fld., awnless ..... 84. Micbochloa 

 Spikelets 1-2-fld., in pedicelled deciduous articulate 



clusters, awned . 85. Graoilea. 



Spikelets 1-2 fld., in sessile inarticulate clusters, awned . 8ri. Enteroi'o&on 

 Spikelets muuy-fld. ; fl. gl. 3-awned . , . .87. Tbipqqon. 



