14 
Rhachis of the spikelet with long hairs enveloping the 
flowering glumes. Lowest flower male. 
Panicle large and loose sos ws ... 85. Phragmites. 
Rhachis of the spikelet glabrous. Spikelets dicecious, 
few with closely imbricate cy Pericarp 
thick and spongy... es . 86. Distichlis. 
Rhachis of the spikelet glabrous or shortly or loosdly 
hairy. Spikelets bisexual. 
Grain free from the palea (except in a few Poze). 
Spikelets usually flat; the flowering glumes 
keeled, entire. 
Flowering glume and pulea thinly 
scarious or hyaline, the glume 
acute or shortly awned, the palea 
keels broadly winged. 
Spikelets in globular clusters in a 
long interrupted spike ... 87. Elytrophorus. 
Flowering glume membranous. or 
herbaceous, three or five nerved. 
Spikelets usually many-flowered. 
Flowering glumes three-nerved. 91. Eragrostis. 
Spikelets few flowered. Flower- 
glumes five-nerved ... .. 92. Poa. 
Spikelets flattened, flowering glume ovith 
hyaline tips, notched or two-lobed, the 
keel forming a small point between the 
lobes or just below them as .. 93. Schedonorus. 
Spikelets narrow. Flowering glumes actinied 
on the back with three or more nerves 
not reaching to the obtuse hyaline apex 94. Glyceria. 
Grain adnate to the palea when ripe. 
Ovary pubescent, obtuse. Flowering glumes 
with a dorsal point or awn below the 
entire or notched hyaline tip ... ... 96. Bromus. 
Ovary glabrous. Spikelets usually narrow. 
Flowering glumes entire, acute we 
awned ... Se ay dae . Festuca. 
Subtribe V.—Hordeaceze.—Spikelets one or several flowered, sessile on 
the opposite sides or alternate notches of the rhachis of a simple spike. 
Glumes entire, awned or unawned. 
Spikelets several-flowered, flat, one side or face of the 
spikelet next to the continuous waa 
notched rhachis a ane . 99. Agropyrum. 
Spikelets one or two flowered, with the rhachis pro- 
duced above the flower, half embedded in 
the notches of the more or less. articulate 
rhachis di ae by de 102. Lepturus. 
