1 1 8 Graminece. 



Spikelets awnless, i-fld. 



Rhachis of raceme inarticulate . . .27. Imperata. 



Rhachis of raceme articulate, fragile . . 28. Saccharum. 



Spikelets awned, 2-fid 29. Pollinia. 



** Spikelets few or many, in more or less dimorphous heterogeneous 



pairs, rarely solitary, by suppression of the pedicelled spikelets. 

 § Spikelets sunk in pits of an articulate fragile rhachis. 



Subtribe 3. ROTTBOELLIEyE. 

 Sessile spikelets solitary in each internode of the spike. 



Glume I. ovate or oblong, smooth . . 30. ROTTBOELLIA. 



Glume I. globose, inflated, pitted . . 31. Manisuris. 

 Sessile spikelets 2, opposite in each internode 32. Mnesithea. 

 §§ Spikelets not sunk in pits of the rhachis. 



Subtribe 4. ISCH./EME^E. — Spikelets many, binate, rarely solitary, 

 secund in solitary digitate or fascicled spikes or racemes. Glume 

 III of sessile spikelet male, rarely neuter. See also Pollinia. 

 Margins of glume I of sessile spikelets inflexed. 



Glumes unarmed ..... 



• 33- 



ISCH^MUM. 



Margin of glume I pectinately aculeate 



■ 34- 



Eremochloa. 



argins of glume I of sessile spikelet 



not 





inflexed. 







Spikelets 2-awned .... 



• 35- 



POGONATHERUM. 



Spikelets 1 -awned. 







L. lanceolate, spikelets 2-fld. . 



• 36. 



Apocopis. 



L. cordate, spikelets i-fld. 



• 37- 



Arthraxon 



Subtribe 5. APLUDEyE. — Spikelets 3, on a very short uninodal 

 rhachis, a sessile 2-fld., and 2-pedicelled, enclosed in a peduncled 

 spathe 38. APLUDA. 



Subtribe 6. EUANDROPOGONE^E.— Spikelets few or many, binate 

 (rarely ternate), a sessile and pedicelled, spicate racemed or panicled, 

 glumes 4, I not or obscurely keeled, III of sessile spikelets o or 

 neuter, IV awned or reduced to an awn. 

 Spikelets in alternating pairs or lower solitary. 



Infl. usually elongate, sessile spikelets many 39. ANDROPOGON. 

 Infl. very short, sessile spikelets 2 . .40. PSEUDANTHISTIRIA. 

 Spikelets dimorphic, 4 lower sessile, forming 

 an involucre around the upper. 

 Rhachis articulate above the involucrant 



spikelets 41. Anthistiria. 



Rhachis articulate below the involucrant 



spikelets . . . , .42. Iseilema. 



Series II. Poacese. — Spikelets solitary, rarely binate, 

 inarticulate on their pedicels and persistent on them when 

 in fr., rarely articulate at the base and deciduous, i-many-fld., 

 if more than i-fld. the upper fl. or fls. male or neuter, 

 fruiting, the uppermost one or more often imperfect; 

 rhachilla of spikelet often more or less produced between the 

 bases of the glumes, and often beyond the uppermost as a 

 mucro, or elongate and bearing reduced glumes — Herbs or 

 (Tribe Bambusece) shrubs or trees. 



