4 CLXXIU. GRA.MINE.K (J. D. Hooker.) 



Fruiting spikelets enclosed in a stony, nut-like polished 



bract . . 28. Coix. 



Fruiting spikelets, having all the inner gl. concealed 



within the greatly enlarged hardened outer . . 29. PoLYTOCA. 



Fruiting spikelets densely crowded on a cylindric spongy 



rachis, gmin exposed 29*. ZKA. 



Subtribe IL* DncntlBA. Spikelet* homogamous, sccuml on a slender 

 inarticulate rachis, 1-fld., diandrous . . . 30. DIMF.KIA. 



Subtribelll. SACCHARE^E.. Spikelet a homogamons, in compound racemes 

 or panicles (except Pollinia) ; gl. I not sunk in a hollow of the rachis. 



* Rachis not or rarely fragile. 



Spikelets in a cylindric silvery thyrsus, 1-fld., not awned . 31 . IMPKR \r\. 



SSpikelets panicled, 2-nate, 1-fld., awned .... 32. MISCANTHUS. 



** Rachis fragile. 



Spikelets in panicled racemes, 2-fld., awned . . . 33. Smi> 



Spikelets in geiniinte digitate or t'aseielfd spikf* . . 31. I'm, LIMA. 



Spikelets in a thyrsus of spieiform racemes, 1-ttd., awnless 3r>. S.uvn 



'pikelets in a thyrsus of spieiforin nuvmes., 1-fld., awned. 30. KBIANTUIW. 



Subtribe IV. ISCIIEME.E. Spikelet* many, in solitary digitate or 

 fascicled spikes, usually hrteromorphous ; gl. I not sunk in a hollow ot the 

 rachis. (See Pollinia in Sarcharete ; Vo'ssia in Roftbotlliece.) 



* Margin* of gl. I of sessile spikelet inftexed. 



Spikes rarely solitary ; spikelets 2-nate, 2-fld., awned . 37. IscH.t.Mi'M. 

 Spikes solitary; spikelets 1-fld., gl. I pectinate . . 38. EKKMOCHLOA. 



** Margins of gl. I of sessile ,<ti>ikelrt not indexed. 



Spikes solitary ; spikelets 2-nate, 1-2-fld., 2-awiu-d . . 39. POOOXATMI 

 Spikes solitary or 2-nate ; spikelets 2-fld., diandrous ; gl. 



1 very hroiid, truncate . . . . . .40. APOC 



Spikes 2-nate or digitate ; spikelets 1-fld. . . . -1 1 . AKTHK\ 



Si.ikes diiritate; spikelets 2-fld. ; gl. I tuln-rcled . . 42. THKI 

 Spikes 2- -nate; spikelets 2-nate, upper alone awued . 43. LopHiu-m- 



Subtribe V. APLUDE^:. Spikelets 3 on an in- 

 articulate rachis 44. APLUDA. 



Subtribe VI. ROTTBOEI.LIE^:. Spikele's homo- or hetero-gamons, 1-2- 

 fld., solitary, or 2- rarely 3-nate on the internodes of an articulate sj-ike 

 or raceme, not awned (gl. I caudate in Vossia) \ gl. I not keeled, adhate 

 to or sunk in a depression formed by the internode and pedicel of the 

 upper spikelet ; gls. of sessile spikelet 4. 



Spikelets 2-nate, gl. I caudate .....'. 45-. VOSSIA. 



Spikelets 2-nate, gl. I flat 46. ROTTBOELLTA. 



Spikelets 2-nate, gl. 1 globose 47, MAMSTRIS. 



Spikelets solitary, gl. 1 convex . ' . . . . 48. OPHIURUS. 



Subtribe VII. BATZEBURGIE^:. Spikelets homo- 

 gamons, 3-nate on the slender internodes of a 

 solitary flattened fragile spike, two perfect, 1-fld., 

 third imperfect ; gls. 4 49. RATZEBURGIA. 



Subtribe VIII. EUANDKOPOGONE.E. Spikelets heterogamous, 1-fld., 2 

 rarely 3-nate on the whorled articulate branches of simple or compound 

 racemes or panicles (solitary in Cleiftachne) ; gls. 4, I net kteled, iV 

 usually awned. 



