4 
Leaf-blades reduced or quite rudi- 
mentary; stems hard and 
Mtge 8 ; spikelets 2-6 mm. 
ong - - - II. Aphyllae. 
Leaf-blades hard, junciform to 
subulate or setaceous, with 
a continuous sclerenchymatic 
hypoderma on both sides and 
strong percurrent girders, 
mesophyll much _ reduced; 
plants 60-90 cm. high; 
glumes 0-9-1-5 cm. long; 
valve mostly densely hairy, 
rarely glabrescent or = eru- 
lous upwards - - III. Sclerophyllae. 
Hyaline margins of the valve not 
produced into lobes, or, if so, 
then the lobes quite incon- 
spicuous and obtuse, rarely 
more distinct (nos. 10 and 16), 
often only one developed; leaf- 
blades without a continuous 
only on the lower side, and 
then mostly very thin; girders 
alternately percurrent and dorsal 
or all percurrent : 
*Perennial : 
Bristle of the awn _ sharply 
recurved like a scythe or 
reaping hook; glumes deli- 
cate an hyaline at sites 
towards the tips . IV. Falcatae. 
Bristle of the awn slightly 
curved or straight, often 
twice geniculate : 
hairs upto4mm.long -  V.’Plumosae. 
-Awn apparently glabrous or 
pubes but not 
plumose : 
Lateral nerves of lower 
glume continuing nearly 
the whole of its length 
appearance : 
