66 FLORA. 



Second empty scale very dissimilar to the fiist, broad and 

 rounded at the summit. 76. EatOnia. 



Flowering scales coriaceous in fruit ; seed beaked and exserted from 

 the scales. 80. Korycarpus. 



Flowering scales 5-many-nerved. 



Flowering scales 3-toothed at the apex. 68. Sieglingia. 



Flowering scales not 3-toothed at the apex. 



Spikelets with 2 or more of the upper scales empty, broad and 



enfolding each other. 79. Melica. 



Spikelets with the upper scales flower-bearing, or narrow and 

 abortive. 

 Keel of the palet winged or with a linear appendage. 



81. Plenropogon. 

 Keel of the palet not appendaged. 



Stigmas placed at or near the apex of the ovary ; flow- 

 ering scales awned only in Nos. 85 and 93. 

 Scales more or less strongly compressed and keeled. 

 Empty basal scales 3-6 ; spikelets flat, 2-edged. 



82. Uniola. 

 Empty basal scales 2 ; spikelets flattened. 



Panicle contracted ; spikelets dioecious. 



83. Distichlis. 

 Panicle open ; spikelets perfect. 



Flowering scales herbaceous, awn- 

 pointed ; spikelets collected in one- 

 sided clusters. 



85. Dactylis. 

 Flowering scales scarious-margined ; 

 rachis glabrous or with webby 

 hairs. 

 Spikelets large, cordate. 



84. Briza, 

 Spikelets mostly smaller, not cor- 

 date. 



Empty scales projecting be- 

 yond the uppermost flow- 

 ering ones ; arctic grass. 



88. Dupontia. 

 Uppermost scales exceeding 



the empty ones ; flowering 

 scales 2-10, mostly webby 

 at base. 



87. Poa. 

 Flowering scales membranous ; rachis 

 hirsute with stiff hairs, extended 

 into a hairy appendage. 



90. Graphephorum. 

 Scales rounded on the back, at least below. 



Flowering scales with a basal ring of 

 hairs, toothed at apex ; water grass. 



89. Scolochloa. 

 Flowering scales naked at the base: 



Obtuse or subacute and scarious at 

 the apex, usually toothed. 

 Plainly 5-7-nerved ; styles present. 



91. Panicularia. 

 Obscurely 5-nerved ; no style. 



92. Puccinellia. 

 Acute, pointed or awned at apex. 



93. Festuca, 

 Stigmas plainly arising below the apex of the ovary J 



scales mostly awned. 94* Bromus. 



Tribe XI. Hokdeae. 



Stigma I| spike unilateral; spikelets x-fiowered, narrow. 95. Nardus. 



Stigmas 2; spike symmetrical. 



Spikelets solitary at the notches of the rachis. 



Flowering scales with their backs turned to the rachis. 96. Lv/ium. 



