351 
Basal leaf -sheaths ultimately loosened and curled • blades 
flat ; raceme-fascicles compound . . 2. C. Jwaraneuaa. 
Panicles more often large and very compound ; raceme- 
joints glabrous or pubescent on the back, bearded along the 
sides, hairs increasing in length upwards, but not concealing 
the s-ssile spikelets; awns, if present (they are normallv 
aosent in the cultivated forms), distinctly geniculate with tli'e 
knee^exserted (Series Ctrutn :- 
Sessile spikelets lanceolate or ovate- or obovate-lanceolate ; 
back flat :— 
Lowest pedicel of raceme scarcely stouter than the 
upper :— 
All the spikelets awnless .... 3. 0. Xavdus. 
Sessile spikelets awned :— 
Panicle erect, dense, often interrupted, with 
rather conspicuous, frequently purplish-brown to 
blackish spathes . ... 4. G. confertijh.ru*. 
Panicle loose, with slender, long, flexuous, often 
drooping branches and comparatively inconspicuous 
spathes, the whole panicle often greyish .... 
5. C.flexuusns. 
Lowest pedicel of racemes much swollen ; panicles 
erect, narrow, often interrupted, the divisions short, 
dense ; spathes and racemes short, the white hairs of the 
joints and panicles often very conspicuously contrasting 
with the pale brown spikelets .... 6. C. coloratu*. 
Sessile spikelets linear to lanceolate-linear, awnless ; 'back 
distinctly concave in the lower part ; panicle usually 
loose ; branches slender, the ultimate branchlets more or 
less nodding ; spathes long and narrow ; hairs of joints and 
pedicels rather spreading 7. C. citratus. 
Perennials, sometimes flowering the first year (or sometimes 
annuals ?) ; innovations mixed (extravaginal and intravaginal), 
forming fascicles from a short collar or very short, slender, 
oblique rhizome ; old culms naked at the base or with the 
withered remains of the basal leaf-sheaths ; blades Hat, 
5-30 mm. wide, rounded to subcordate and stem-clasping at the 
base, of a soft texture, with smooth edges (at least in the lower 
part) ; the first (outer) glume of the sessile spikelet with a narrow 
groove from the middle downwards corresponding to a keel inside 
(Series Rusae) :— 
Culms in loose, rather scanty fascicles, erect and simple or 
nearly so, usuallv tall and robust; basal sheaths soon 
withering; blades 10-30 mm. wide (rfrelj nuAw 10 mm.), 
somewhat fat, rich green, at least above: panicles lO-3oeni. 
long, rather loose, turning reddish ij'tif.i very bright i when 
Culms in somewhat loose, often copious fascicles, erect or 
geniculates ascending, very slender, frequently branched, 
the branches often in fascicles from the knees of the culms ; 
sheaths soon withering ; blades 2-6 mm. wide, thin, glaucous ; 
panicles usually loose, 10-20 cm. long, glaucous or straw- 
colour when mature CaenW ~ 
