4 



CLXxiii. GRAMiNE^;. (J. D. Hooker,) 



rruiling spikekts enclosed in a stony, nut-like polished 



bract . • . • • • . • • • 

 Fruiting spikelets, having all the inner gl. coucealed 



witliin the greatly enlarged hardened outer 

 Fruiting spikelets densely crowded on a cylindric spongy 



raehis, grain exposed ....... 



28. Coix. 



29. POLYTOCA 



29*. Zea. 



slender 



SnbtriLe II. DiMERiE^. SpiJcelets homogamous, secund on a 

 inarticulate raehis, 1-fld., diandrous . . .30. Dimekia. 



Sabtribelll. Saccharej:, Spikehts homogamous, in compound racemes 

 or panicles (except Pollinia) ; gl. I not sunk in a liollow of tlie raehis. 



Raehis not or rarely fragile, 

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

 hpikelets panicled, 2-nate, 1-fld., awned . • • • 



31, 

 32. 



Impeeata. 



MiSCAiiTHUa. 



«• 



33. 

 34. 

 35. 

 36, 



Spodiopogon 

 Pollinia, 

 Saccharum. 

 Eeiakthus. 



Sachis fragile. 

 Spikelets in panicled racemes, 2-fld., awned 

 Spikelets in gemiu'ite digitate or fascicled spikes 

 Spikelets in a thyrsus of spieiform racemes, 1-fld., awnless 

 Spikelets in a thyrsus of spieiform racemes, 1-fld., awned. 



Subtribe IV. Ischeme.e. Spikelets many, in solitary digitate or 

 fascicled .spikes, nsnally heteromorphons; gl, I not snnk in a hollow of tlie 

 rachirt. (See Pollinia in Sarcliarece ; Vossia in Rotthoelliece.) 



Margins of gl. 1 of sessile spikelef injlexed, 

 S^pikes rarely solitary ; spikelets 2.nate, 2-Hd., awned 

 Spikes solitary; spikelets 1-tld., gl. I pectinate • . 



37. IscH^MUM. 

 38. Eremochloa, 



•« 



Margins of gl, I of sessile spikelet not infiexed. 



Spikes solitary ; spikelets 2.nate, 1-2-fld., 2-awaed . ■- • 

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



I very broad, truncate . ^ . i " : *; » 



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



Spikes digitate; spikelets 2-fld. ; gl, I tubercled • . 

 Spikes 2-0) -nate ; spikelets 2-nate, upper alone awned 



39. PoaoNATHERUai. 



40. Apocopis. 



41. ArtiikaXON. 



42. Thelepogon. 



43. lophopogon. 



Subtribe \ . 

 articnlate raehis 



Spikelets 3 on an in- 



■'• 



44, Aplttda. 



Subtribe VI. RoTTBOEtLiE.E. Spikelets homo- or hetero-gamous, 1-2- 

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

 or raceme, not awned (gl. I caudate in Vosaia) ; gl. I not keeled, adnate 

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

 npper spikelet ; gls. of sessile spikelet 4. 



Spikelets 2-nate, gl. I caudate . 



Spikelets 2-uate, ^\, 1 flat . • 

 Spikelets 2-nate, gl. I globose 

 Spikelets solitary, gl. I convex 



Subtribe VII. Ratzeuurgie^. 

 gamous, 3-nate on the slender 

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

 third imperfect ; gls. 4 49. Ratzebubgia 



i. 



45. Vossia, 



46. Rottboellta. 



47. Maxisuris, 



48. OrmuuTJs. 



Spikelets homo- 

 internodes of a 



'i 

 1 



h 

 J ■ 







Subtribe VIII. Ecjaxdropogone.e. Spikelets heterogamous, l-fld., 2- 

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

 racemes or panicles (solitary in Gleistachne) : gls. 4, I not keeled, iv 

 usually awned. 



4 

 1 



^-1 





Hi 



■' '■''* ' ■. 



>n 



I V 

 ( 



