4 



CLxxiii. GBAMINE/B. (J. D. Hooker.) 



31. Ijtpeeata. 



32. MlSOAKTHUS. 



Fruiting spikelefcs enclosed in a stony, nut-like polished 



brjict ... 28. Coix. 



Fruiting spikelets, having all the inner gl. concealed 



within the greatly enlarged hardened outer . 29. Polttoca. 



Fruiting spikelets densely crowded on a cylindric spongy 



rachis, grain exposed 29*. Zea. 



Subtribe II. Dimerie<b. Spikelets Jiomogamons, secund on a slender 

 inarticulate rachis, 1-fld., diandrous . . .30. Dimebia. 



Siibtribelll. Sacchabe^. Spi^e/efe homogamous, in compound racemes 

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



* Machis not or rarely fragile. 

 Spikelets in a cylindric silvery thyrsus, 1-fld., not awned . 

 iipikelets panicled, 2-nate, 1-fld., awned .... 



** Sachis fragile. 



Spikelets in panicled racemes, 2-fld., awned . . . 33. SponropoaON. 



Spikelets in geminite digitate or fascicled spikes . . 34. Pollinia. 



Spikelets in a thyrsus of spiciform racemes, l-fld., awnless 35. SACCHAErm. 



'pikelets in a thyrsus of spiciform racemes, 1-fld., awned . 36. Eeianthus. 



Subtribe IV. Ischem:e,b. Spikelets many, in solitary digitate nr 

 fascicled spikes, usually fapteroniorphous; gl. I not sunk in a hollow of the 

 rachis. (See Pollinia in Sa'-charece ; Vossia in Rotthoelliece.) 



* Margins of gl. I of sessile spihelet inflexed. 

 Spikes rarely solitary ; spikelets 2-nate, 2-fld., awned 

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



** Margins of gl. I of sessile spikelet not inflexed. 

 Spikes solitary ; spikelets 2-nate, 1-2-fld., 2-awned . 

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

 1 very bread, truncate ...... 



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



Spikes digitate ; spikelets 2.fld. ; gl. I tubercled 



Spikes 2-x -nate ; spikelets 2-nate, upper alone awned . 



37. IscH^Mtrjl. 

 38. Ebemochloa. 



39. PoaONATHEKUM. 



40. Apocopis. 



41. Aktheixon. 



42. Thelepogo.v. 



43. lophoi'oqon. 



Subtribe V. Apltjde^. 

 articulate rachis 



Spikelets 3 on an in- 



. 44. Apluda. 



Subtribe VI. Rottboellte/B. Spikelets homn- or hetero-gamous, 1-2- 

 fld , solitary, or 2- rarely 3-nate on the internodes of an articulate snike 

 or raceme, not awned (gl. I caudate in Vossia) ; gl. I not keeled, adnata 

 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 ', iQ, Rottbof.llia. 



Spikelets 2.nate, gl. I globose 47, Manisuki.s 



Spikelets solitary, gl. I convex 48. Opuiueds. 



Subtribe VII. RATZBBURGiEa;. Spikelets homo- 

 gamous, 3-nate on the slender internodes of a 

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

 third imperfect ; gls. 4 49. Ratzebubqia. 



Subtribe VIII. Euandbopogone^. Spikelets heterogamous, 1-fld., 2- 

 ravely 3-nate on the whorled articulate branches of simple or compo'uiid 

 racemes or panicles (solitary in Oleisiachne) : gls. 4, I not keeled iV 

 usually awned. 



