POACEAK 



Spikelets 1 -flowered. 

 Splkelets H-many -flowered. 

 Spikelets in two rows. 



A<;I>STII.I:AI; 

 TuinK vi. KKSTICKAI: 

 TBIBBV. CHLORIDEAE. 



TKIBE I. MAYDEAE. 



Fertile splkelets Imbedded In the Internodes of the thick 

 racbls. 



TRIBE II. AXDROPOGONEAE. 



Internodes of the rnrhls not thickened nor excavated for 



the reception of the splkelets. 

 Splkeleta alike, perfect. 



Azli of the racemes continuous, not articulated. 

 Axis of the racemes articulated. 

 Splkelets not alike. 



Senile spikelets alike throughout the Inflorescence. 

 Racemes singly disposed : apex of the rachls-inter- 

 nodes a translucent cup-shaped, entire or Irreg- 

 ularly toothed, appendage. 

 Raceme* disposed in pairs or more : apex of the 



rachls-lnternodea not appendaged. 

 Some or all of the racemes sessile. 

 All of the racemes more or less pedunculate. 



Lower splkelets differing from the others. 

 Internodes of the rucbis much thickened, 



to receive the splkelets. 

 First scale of the splkelet flat or convex. 

 First scale of the splkelet globose. 



nd excavated 



TRIBE III. PANICEAE. 



Spikelets not sunken in the rachls. 

 Splkelets naked, not involucrate. 

 Empty scales 2. 



Lower empty scale with a thickened ring-like 



callus. 

 Lower empty scale unappendaged. 



Splkelets ovate to orbicular, usually obtuse, 



rarely acute. 



Splkelets lanceolate, acute or acuminate, 

 r scales 3. 



ipty scales awned or awn-pointed. 

 Stems erect : leaf-blades long and narrow : 



racemes usually of mnny spikelets. 

 Stems creeping : leaf -blades snort and broad : 

 racemes or clusters usually of few splkelets. 

 Empty scales not awned. 



Second scale not saccate at the base. 



Stems and branches not woody nor bamboo- 

 Fruiting scale rigid, the margins 



Inrolled. 



Palet of the third scale not enlarged. 

 I'alet of the third scale enlarged, 



forcing the splkelet open. 

 Fruiting scale not rigid, the hyaline 



margins not lnrull<><l. 

 Hplkelets long silky : fruiting scale 



lanceolate-acuiuiniiti-. 

 Splkelets glabrous or short-pubes- 

 cent: fruiting scale elliptic. 

 Stems and branches woody, bamboo-like, 



outer scale* papery, woolly-tipped. 

 Second scale saccate at the base. 

 Rplkelets Involucrate. 



Involucre of numerous bristles. 



Bristles persistent : splkelets deciduous. 

 Bristles deciduous with the splkelets. 

 Involucre of 2 spine-bearing valve*. 

 Rplkelets sunken In one aide of the flat racbls. 



Tain IV. AURO8TIDEAE. 



r'lowerlnc scale Indurated when mature and very closely 



embracing the grain, or at least firmer than the 

 scales. 



. .' 



t. TRIPSACUH. 



2. IMITKATA. 



3. EEIAMIUS. 



4. SCIIIZACHYRIUU. 



5. ANDROPOGON. 



6. CHRTSOPOOOX. 



7. ih:n soroooir. 



8. COELORACHtS. 



9. HACKELOCHLOA. 



11. EKIOCHLOA. 



10. PASPALVU. 

 12. SYNTHERISUA. 



13. ECU I M>< HI "A 



14. Ul-I.I.sMI.M S. 



15. PANICCM. 



16. 8TEISCHI8MA. 



11 a. VALOTA. 



12. SYNTHBRISMA. 



17. LARIACIH. 



18. SACCIOI.EPIS. 



10. CHABTOCIII <>\. 

 20. CBNCHBOP8I8. 



Jl. ri:.s.-mtrs. 



