34. 9. GRAMINEAE. 



3. Spikelets falling entire. Lower glume smaller or 0. 

 Glumes not keeled. 4. 

 Lower glume persistent, distinct and keeled. Upper glume 



sometimes falling with the spikelet. 7. 



4. Spikelets sunk in hollows or adpressed to the face of a broad 



rachis. Stem creeping. 19 STENOTAPHRUM. 



Spikelets not sunk in hollows on a broad rachis. 5. 



5. Lower glume distinct. 14 PANICUM. 

 Lower glume minute or 0. 6. 



6. Nerves of lower valve 5 — 7 close straight and prominent. 



Lower glume minute. 13 DIGITARIA. 



Nerves of lower valve 5 or fewer. Side nerves curved and 

 usually submarginal. Lower glume absent. 



12 PANICUM. 



7. Spikelets 1 flowered. No male or barren valves. 8. 

 Spikelets 2 or more flowered or with 1 perfect flower and 1 



or more male flowers or empty valves. 9. 



8. Glumes shorter than the glabrous valve. 42 CYNODON. 

 Glumes longer than the ciliate valve. 43 MICROCHLOA. 



9. vSpikelets with 1 perfect and 1 or more male or barren flowers. 



10. 



Spikelets with 2 or more perfect flowers. 13. 



10. More than one spike in the inflorescence. 46 CHLORIS. 

 Spike solitary. 11. 



11. Spikelets awned. 44 CTENIUM. 

 Spikelets awnless. I2. 



12. Upper glume much longer than the lower. 



45 HARPECHLOA. 

 Lower glume slightly longer than the upper. 



43 MICROCHLOA. 



13. False spikes numerous arranged spirally. l4- 



Spikes or false spikes solitary or umbelled. 16. 



14. Valves minutely notched. 40 DIPLACHNE. 



Valves entire. 15. 



15. Tips of rachilla joints fringed with minute hairs. 



39 POGONARTHRIA. 



Tips of rachilla joints not fringed. 41 ERAGROSTIS. 



16. Spikes terminated by a spikelet. 47 ELEUSINE. 



Point of rachis naked, projecting. 48 DACTYLOCTENIUM. 



17. Spikelets with 1 perfect floret, with or without 1 or more male 



or barren florets or empty valves below it. 18. 



Spikelets with 2 or more perfect florets or very rarely with 



only 1 perfect floret which has male or barren florets or 



empty valves above it. 53. 



18. Spikelets in pairs usually one sessile the other pedicelled, the 



