189. GBAMINE^. 



14. 



usually 1 fld. and awned (2-tld. iu some 

 IschcBinastrae). Gen, 5-1-80: — 

 . All spkts. alike iu shape and sex oi' if un- 

 like then palea very short :— 

 i Spikes in couipoiind panicles or race- 

 mously arranged on an elongate 

 common axis. Spkts. 1-M. Gl. iv 

 awnless or awned from the entire tip 

 or from the sinus of a 2-toothed tip. 



Gen. 54-55 12. Saccharastrse. 



t'r Spikes digitate or solitary. 1-fld. or if 

 2-tld. then glume i channelled: — 

 X Rhachis inarticulate. Spkts. not 



paired Genus 56. Dimeria. 



XX Rhachis articulate : — 



Spkts. in solitary terminal capillary 



spikes, 2-awned , . Genus 57. Pogoiiafhenim, 



Spkts. m digitate spikes 1- or 2- 

 awned. Gen. 57-60 . . . .13. PoUiniastrse. 

 .. Sess. and pedicelled spkts. dissimilar or if 

 similar {Polluiidium) palea well deve- 

 loped and rhachis compressed. Sess. 

 spkt. •2-sexual, ped. male, empty or :— 

 t Fertile spkts, 2-tld, : — 

 Both spikelets awned. Joints and pedi- 

 cels often flattened or thickened 

 Palea well developed 

 Pedicelled spkt. reduced to its pedicel 



Genus 61. 

 Sessile spkt, awnless, Gl. i 3-toothed, 

 Ped. spkt. awned . . . Genus 65. 

 it Fertile spkts. 1-fld.:— 



X Panicles esjmtheate (spikes not sub- 

 tended by spathes) : — 

 § All pairs of spkts. alike, in simple 

 or compound panicles : — 

 li Gl, iv awned from low down 

 on back. Spikes digitate 



Genus 66. 

 i'l Gl. iv awned from the tip or • 

 ."iiuus : — 

 Gl, iv reduced to the hyaline 

 stipitiform base of the awn. 

 Joints and pedicels tiliforni 

 with a depressed translucent 

 middle line. Gen. 67, 68 

 Gl. iv 2-cleft with awn from the 

 sinus. Joints and pedicels 

 solid (slightly mesially trans- 

 lucent in Sorghum fascicu- 

 laris). Gen. 69-71 . 

 §§ Lowest pair or pairs of spikelets 

 differing from all those above 

 them, homogamous (male or 

 neuter). Joints and pedicels 

 solid : — 

 Spikes digitate, rarely solitary. 

 Sess. spkts. dorsally com- 

 pressed. Gl. iv a naked awn 

 acute at the base . . . .72, Dicanfhium, 

 Spikes solitary. Sess. spkt. sub- 

 eylindric. iv a long very stout 

 awn and often a hyaline base. 

 Callus of sess, spkt, pungent . 73. Ueteropogon, 

 XX Panicles spatheate. Spikes usually 

 2-1 (rarely more) oti a common 

 peduncle which is closely sheathed 



941 



Ischaemastrae. 



Apocopis. 

 Lophopogon. 



Arthraxoii , 



15. Amphilophiastrse. 



16, Sorghastrse. 



