716 GEAMINBiE 



23 Arlstida Awn triple, continuous or articulated with the glume. 



24 Phlenm Panicle dense and Bpike-like: glumes distinct: awn simple. 



25 Alopecurus Panicle spike-like : glumes more or less united at base : 

 awn simple. 



Tribe vi Ayenace^ Spikelets panicled 2-several-flowered, 

 rachis often bearded, prolonged into an ipaperfect rudiment. 

 Glumes mostly equalling 8r exceeding the flower. Flowering 

 glumes usually bearing an awn on its back or between its teeth. 



* Spikelets with 2,:0r more lower flowers perfect. 



36 Danthonia Spikelets several-flowered, awned.from the 3 united 

 middle nerves. 



27 AvENA ■ Spikelets 2-flowered,'awned from the njidnerve only. 



28 Trisetum Spikelets 2-several-flowered: flowering glume 2-toothed 

 at the summit, awned from the midnerve only. 



29 AiRA Spikelets 2-flowered, both i>erfect, the rachella not prolonged 

 beyond the upper one. 



SO Deschampsia Spikelets with 2 perfect flowers, the rachella prolonged 

 beyond the second flower. 



* * Spikelets 2-flowered with one flower stamina te 



31 Arbhbnatherdm Lower flower staminate, upper perfect and ^usually 

 awnless. 



32 HoLcus Lower flower perfect, awnless, upper staminate and awned. 



Teibe vn Festuge^ Spikelets panicled, 2-many-flowered, 

 the rachis usually prolonged and bearing an imperfect flower or 

 bristle. / 



* Lower one or two flowers staminate or neutral. 



38 Manroa Spikelets in clusters in the axils of the upper leaves, with 

 the two lower glumes empty. 



31 Phragmltes Spikelets in an ample panicle^ with one staminate flow- 

 er below 2-4 perfect ones : rachis bearded with long hairs. 



* * Lowest flowers all perfect : grain not adherent to the palet. 



■>- Flowering glumes pointed, awned or acute, the nerves, when 

 present, running into the point. 



36 Dactylis Spikelets in dense one-sided clusters in a one-aided panicle : 

 glumes herbaceous, compressed, awn-pointed.. 



86 KcBlerla Spikeletsinadensespike-likepanicle: glumeamembranous, 

 keeled, pointed or mucronate. 



' ■•- ■»- Flowering glumes pointless and, except in itelica, awnless, 

 obtuse ; the nerves parallel, 



*» Flowering gljiiige 1-nerved ; the^palet 3-nerved. 



37 Eatonia Glumes very unlike; the upper one much broader than the 

 linear lower one afflS'Viapped around .the flower. 



-"■ ■"■ One or two of the glumes 5-nerved or more. 



38 iSIellca Flowering flumes flattish on the back, 7-nerved or more, 

 membranaceous at tip: fertile flowers 1-3, the upper enwrapping the 



