16 CLASS III. ORDER IT. 



FestUca. Calyx i-valved, many-flowered ; 

 spikelets oblong, leretish, or diverging ; awnlesa 

 or furnished wjth a terminal awn. 4. 10 — firatensis 

 (fescue-grass) panicle pointing one-way, spikelets 

 linear. 11 — lutior. panicle nodding, spikelets ovate- 

 lanceolate % — .^tti/aws, panicle erect. 2/. 



BuoMus Calyx 2-valved ; spikelets oblong, te- 

 Tete-2 tanked; valves awned below the tip 4. 10. 

 — .§eca/m?z.9, (ches^) awnless, panicle spreading — 

 fnollis, (broom-grass) florets imbricate, panicle 

 compact- % • 



AvENA. Calyx 2-vaIved, many-flowered ; valves 

 with a twisted awn on the back : glumes membrana- 

 ceous and somewhat follicle-like. 4. 10 — saliva^ 

 (oats) panicled, calyx 2-seeded. 0. 



Arundo. Calyx 2-va:lved, one or many-flower- 

 ed, glabrous : florets heaped together . corol sur- 

 rounded with wool. 4. 10 — phra^mitesi (reed-grass) 

 calyx 5-flowered. 2/. 



B. Flowers fioly^amoua, 



iRt. Glume I'Jloivered, 



Andropogon. Calyx glume 2-valved: corol 3- 

 valved : flowers in pairs; 1 sessile perfect, the oth- 

 er peduncled, stainate, awnless — rarely neutral. 4. 

 to — nutans, (beard-grass) panicle compact, nod- 

 ding, calyx bristly. 



2d. Glume 2'Jio%veredy or more. Panicled, 



HoL€Us. Calyx glume 2-valved, opake, ner- 

 vous : corol smaller than calyx, 2-valved, the outer 

 one-awned under the tip : nectary linear 2-parted : 

 stigma subsessile. 4. 10 — lanatus, (soft-grass) 

 glumes hairy. % — odoraius, glumes 3-flowered) 

 pointed, awnless. %» 



* Alsine. 



