MOXOCOTYLEDOXOUS Oil EXDOGEXOUS PLANTS. 593 



** Grain adherent to the upper palea, downy at the apex. 



Lower pa'ea entire, acute or awn-pointed Festuca. 



•2-cleft, awned between the teeth Bromus, 



♦** Grain free, stnooth ; lowest Jlotvers of the spike'.etis imperfect. 



Spikelets broad and flat, many-flowered. Taleae coriaceous Uniola. 



Tribe Vf Hordeaceae. Spikelets 2-several-flowered, 

 sessile, on opposite sides of the jointed rachis, spiked. 

 Glumes 1-2, rarely wanting. PaletB 2. 



Spikelets 2-4 at each joint of the rachis. Glumes 2, placed side by side before the 



spikelets Eltmtjs. 



2-3 at each joint of the rachis. Glutnes none Gymnostichum, 



Tribe VI. Avenacese. Spikelds^wmoldii, 2-.several- 

 flowered, the terminal flowers mostly imperfect. Rachis 

 or base of the flowers often bearded. Lower palea with a 

 twisted, bent, or straight awn on the back, or below the 

 apex. 



Spikelets Z-several-flowered. Lower palea thin, compressed-keeled, bearing a bent 



atcn below the 2 cUft apex Trisetum. 



2-Jloicered, the loiver flower staminate, and bearing a long bnit ami 



beloiv the middle Arrhenatheeum. 



Tribe VII. Phalaridese. Spilcehts in spike-like 

 panicles, 3-flowerrd, the upper or middle flower perfect, the 

 two lateral ones imperfect or mere rudiments. Glumes 2. 

 PalecB 2, indurated in fruit. 



Lateral flowers rudimentary. Perfect flowers tHandrous Phalabis. 



Tribe VIII. Panicese. Spikelets 2-flowered. Glumes 

 2, or the lower wanting. Lower ftoiver imperfect, either 

 staminate or neutral, with the lower palea membranaceons 

 and similar to the upper glume, the upper one mostly 

 ■wanting. Palece of the perfect flower coriaceous. Grain 

 mostly grooved or flattened on the outside. Flowers in 

 spikes or panicles. 



* Lower glume and upper palece of the sterile floicer wanting {the spikelet appearing 

 like a single forcer, uith 2 glumes and 2 palece). 



Spikel.ts alike, planoconvex, in 1-sided spikes Paspalum. 



