58 



THE TRUE GRASSES. 



cemes solitary, terminal upon the branches and culm, 

 subtended by sheathing leaves. Rachis slender, with- 

 out appendages ; flowering glume awned from the point 

 or from a narrow slit, or awnless. 



Species five, scattered through the tropics (A. spathi- 

 florus Kunth from Paraguay to Cuba). 



Sub-genus IV. Anaddphia (Hack, as a genus). Like 

 the preceding, but only a part or none of the sessile, $ 

 spikelets are accompanied by $ ones. 



Species one, in tropical Western Africa. 

 Sub-genus V. Arthrolophis (EuEastaxon Steud. as a 

 genus). Racemes mostly in pairs, rarely digitate or 

 panicled, the lateral ones sessile ; 

 joints of the rachis somewhat 

 thickened, not translucent. 

 Flowering glume usually bifid or 

 two-toothed. 



Species fifty, the majority 

 American (A. Virginicus L. 

 ["Broom Sedge"] and its allies, 

 A. provincialis Lam., etc.). 



Sub-genus VI. Amphilophis. 

 Racemes digitate or panicled, all 

 pedicellate. Rachis-joiuts and 

 pedicels witli a median, longitudi- 

 nal, translucent line. Flowering 

 glume pedicel-like, tapering into 

 an awn. 



Species fifteen, mostly of the 

 Old World. A. Ischwmum L. 

 (Fig. 17) of ('(Mitral Europe and 



tWW/JT Asia, and A. xaccharoides S\v. of 

 % ^jmJK\ America, belong here. 

 Sub-genus VII. Sorghum 

 L- WJwl (Pers. as a genus, Blumeiibachia 



Kol.). Racemes in panicles, fre- 



Fio. 17.Andropogon Ischce- 



Germ 'i s f )% ^pai^of q uent; l.y w ^ n few (sometimes only 

 spikelets.' one) fertile spikelets. Rachis- 



joints without a translucent line, empty glume usually 

 broad-lanceolate, finally indurated and shining. 



