157 



TRIBE vn. STIPES. 

 Awns 3 from the entire tip, or one, simple below and 

 3-branclied above, very rarely quite simple, 

 kneed and twisted below the knee, Ligule a 

 fringe of hairs. Aristida. 



Floret cylindric or linear-oblong ; awn solitary, simple, 

 kneed and twisted below the knee. Ligule 

 membranous . Sttpa . 



TRIBE VIII. ZOYSIEiE. 



Spikelets falling singly. Glumes equal, long awned, Perotis. 

 Spikelets falling in clusters of 2-4, upper (outer) glume 



beset with hooked spines, or short bristles. Tragus. 



GROUP B. 



Valves 3-nerved, rarely 1-nerved (Sporoboleae ; Ega- 



grostese ; Chlorideee). 

 Valves 5-many nerved, very rarely (as in Triphlebia) 3- 



nerved. Oryzeee; Festucese; Hordeae; Phalarideae. 



TRIBE IX, SPOROBOLE^. 



The only genus represented in Natal. 



TRIBE X. ERAGROSTE^. 



Spikelets densely crowded on the flattened rhachis of 

 stiff secimd false spikes, which are spirally 

 arranged on a long axis. Tips of rhachilla 

 joints fringed with minute hairs. Valves 

 acuminate, entire. 



Spikelets more distant, or even remote on the slender 

 rhachis of often flexuous false spikes. Valves 

 usually 2-toothed or minutely notched. 



Spikelets usually panic! ed, rarely in simple spikes. 

 RhachiUa often persistent. Valves usually 

 numerous and closel}^ imbricate, broad, entire, 

 awn less. Pales persistent or deciduous, but 

 usually not falling together with the valves. 



TRIBE XI. CHLORIDES. 



Spikelets crowded in 2-ranked secund spikes. 

 Spikelets panicled, pedicelled (though often very 

 shortly) or siibspicate but not on the flattened 

 rhachis of a 2-ranked, secand spike. 

 1 Foret 1, awnless. Rhachilla not continued beyond 

 the floret, or only as a minute point, or a naked 

 bristle. 

 1 Florets several, one hermaphrodite, the others 

 male or barren. 



SrOROBOLUS. 



POGONARTHRFA. 



DlPLACHNE. 



Eragrostis 



