10. 
(13 ) 
Holcus.—Spikelets 2-flowered, inferior 
floret &%, awnless; superior floret ¢, 
aristate. 
Aira.—Spikelets 2-flowered, both 4%; 
inferior palea 4-dentate at its apex, aris- 
tate from its base. 
Avena.—Spikelets 2—0o-flowered. Flor- 
ets 8: Inferior palea 2-dentate at its 
apex, aristate from its median nerve. 
Danthonia. — Spikelets 2-a-flowered. 
Florets %. Inferior palea 2-cleft, aris- 
tate from the fissure. 
Melica.—Spikelets 2- o-flowered, florets 
awnless, the inferior or % inferior, 8 ; 
the rest rudimentary. 
Keeleria.—Glume and palee membrana- 
ceous. Spikelets 2-o-flowered. Flor- 
ets lanceolate, compressed, carinate; 
inferior palea mucronate-aristate. 
Dactylis.—Glume and pale herba- 
ceous. Spikelets 3-a-flowered. Flor- 
ets ovate, carinate. Inferior palea 
asymmetric, mucronate-aristate. 
Poa.—Spikelets 2--flowered. Florets 
ovate, carinate, awnless, deciduous with 
the joint of the axis. 
Eragrostis.—S pikelets 2-c-flowered. 
Florets ovate, carinate, awnless; supe- 
rior palea and axis persistent. 
