10 
Spikelets in single or few pairs or triplets on the 
slender branches of amore or less compound 
' panicle. 
Panicle long and dense, usually cylindrical, the 
spikelets awnless, concealed under long 
silky hairs ie os ... 30. Imperata. 
Panicle loose. Fertile spikelets amet 
Outer glume either membranous or narrow 
and rigid with two ipa: often 
muricate lateral nerves.. KS ... 31. Chrysopogon. 
Outer glume when in fruit hard, qmantl 
and shining, ovate or lanceolate ... 32. Sorghum. 
Spikelets in triplets (one sessile and fertile between 
two pedicellate and male neuter or rudi- 
mentary) within sheathing bracts. 
Triplets surrounded by an involucre of four male 
or neuter spikelets at the base of the 
peduncle... ee Re. . 33. Anthistiria. 
Triplets sessile or pedunculate edie the beet 
without any involucre . po . 34, Apluda. 
Subtribe V.—Tristeginez.—Spikelets ‘arilagad all piece the terminal 
flowering glume more or less stiffened or enlarged when in fruit almost as in 
Panicew, but the awn twisted and bent as in Andropogonee. 
Glumes four, two empty, the third with a male 
flower or empty. Panicle loose . 35. Arundinella. 
Primary Series B. POACE®,—Spikelets not articulate below the outer 
glumes. “Rhachis of the spikelet articulate above the two or three lowest 
glumes, or wholly continuous. Spikelets with one or more fertile flowers, the 
males or impertect ones, if any, above or very rarely below them. 
(In a few Phalaridez the lower glumes are deficient.) 
Tribe IV.—PuataRnipEx.—Spikelets with one terminal bisexual flower 
and rarely two male flowers lower down. Glumes two to six, all keeled or 
with a central nerve, two below the articulation of the rhachis persistent or 
in several genera deficient, four or fewer above the articulation, of which two 
enclose the grain without any distinctly two-nerved palea. 
Stamens six, rarely three. No glumes below the 
articulation. 
Spikelets very flat. Glumes two, without any 
small ones ... Jie Mae ... 38. Leersia. 
Spikelets not tend (eae four, mem- 
branous, the two outer very small ... 40. Potamophila. 
Stamens six or four, very rarely three or two. Two 
persistent glumes below the articulation. 
Stamens four, rarely two. Spikelets raga 
more or less awned m= : .. 42. Microlena. 
Stamens four. Spikelets not mecrieal By ... 43. Tetrarrhena. 
Stamens three, rarely two. Glumes three, none below 
the articulation. 
Flowering glume awned. Panicle dense, cylin- 
drical, spike-like ... = se . 44. Alopecurus. 
