42 



PANICACE.E. 



Subfrenus 5. Sorgtium (I'ers. as a p:omis). Spikelcts truly and 



conspioiioiisly paniculate, rays 

 consisting of a sessile fertile 

 one on a pedicel, the branches 

 pedicellate si)ikelets. First and 

 spikelcts coriaceous. 



slender, the lateral in })airs. 

 one and a staminate or abortive 

 terminating in 1 sessile and 2 

 second glumes of the fertile 



Fig. 14.— Spikelets of A. Hallii. 



a. Rays of the i)anicle verticellate ; the pedicellate spikelets 



staminate witii -t glumes, rarely 1-2 and neuter. ... 26 



a. Rays of the panicle mostly solitary, but branching near the 



base (b) 



b. Pedicellate spikelets none or sometimes reduced to 



pedicels merely (c) 



c. Panicle oblong, erect or nodding 27 



c. Panicle secund, rays variously llexuose 28 



Subgenus G. Chkysopogon (Trin. as a genus). Racemes 

 whorled, pedicellate, spikelets obviously paniculate and laterally 

 compressed. Our single species is a tall annual; the aAvns 12-15 



cm. long 29 



Subgenus 7. Diciiaxtiium (Willemet as a genus). Spikes 



