48 GRAMINE.X. 



Joints of rachis few ; spikelets articulate on 

 the obliquely truncate, "bearded tips of the 

 branches of the panicle. 

 Spikelets in threes, 1 sessile between 2-pedi- 

 eellate. 43. Chrysopogon. 



Lowest one or more sessile spikelets differing from 

 all those above it in sex or form. 



Spikes binate on the peduncle which is 

 enclosed in a spathiforrn sheath ; sessile spikelet 

 dorsal ly compressed. 44. Cymbopogon. 



Spikes solitary, lower pairs of spikelets very 

 unlike the upper ; upper sessile spikelets 

 cylindric ; all spikelets monoecious. 



45. Heteropogon. 



Spikelets in 2 superposed series ; upper series 

 of hetero gamous pairs, and a terminal 

 male, lower a whorl of 4-persistent males 

 or neuters. 46. Themeda. 



Series B. Poagece. Spikelets continuous (not articulate with) their 

 pedicels, 1-many-fld., rachilla articulate at the base, and often between the 

 fig. gls.; lowest fl. always fruiting, upper often male or neuter. (Exceptions. 

 Articulate on their pedicels in Polypogon. Upper fl. alone bisexual in 

 PhalaridecK. Spikelets articulate on their pedicels, or gl. I and II separately 

 deciduous occur in Alopecurus, Melica : see under Panicece some genera with 

 spikelets inarticulate at the base). 



TRIBE V. AGROSTIDEA:. Spikelets 1-fld.; rachilla jointed at the 

 base, produced or not beyond the flg. gl.; gls. 3, 1 and 

 II empty, III flg. awned. Exceptions : Spikelets 

 sometimes 2-fld. in Sporobolus and MueMenbergia. 

 Subtribe I. Phleoidece. Spikelets in spiciform or suhspici- 

 form panicles, gl. III. hyaline, loosely wrapping the 

 grain ; stigmas exserted from the top of the spikelet. 



47. Alopeciirus. 



