55° ORAMfNE,* 



14. Folypcjgox. — Prt;;7f/r spike-like ; glumes awned. 



15. Cat.a,\ia(",r6si 1:^. — Raclnlla with long, silky hairs; flowering 

 gluDie awned. 



*''' Ruc-JiiUa produced beyond floK'eriiig glume 



16. GAsTki'iiiu.M. — Peiuielc spike-like:; outer glumes awnless ; 

 floiaeriiig glume minute, 4-toothed. 



17. Apera. — Pauu'le lofjse ; flowering glume slightly 2-fid, with 

 a long, slender awn. 



iS. AM.MiipHir.A. — Pennele spikc-Iike; spikelels large; rachilla 

 long, silky ; flowering glume minutely awned. 



19. Lagurus. — Pamele spike-like, ovate; ouler glumes ending 

 in a long, fringed bristle ; flowering glume 3-awned. 



Tribe 5. Aveneee. — Spiltelcls in panitles, 2 — 4 flowered ; rachilla 

 generally produced beyond llie flowering glume ; glumes 4 or more, 

 2 lowest empty, equalling or overtopping t/ie flowers : flowering 

 glumes with twisied dorsal aivus 



20. Ai'ra. — Panicle loose; rachilla not produced; aian dorsal, 

 generally bent ; ovary glabrous. 



21. CoRYNKPHORUs. — Flowers 2, perfect; awn jointed in the 

 middle, with a club-shaped tip. 



22. HrjLCU.s. — Flowers 2, lower perfect, awnless, upper stami- 

 nate, awned. 



23. Trisktum. — Flowers 2 — 6 ; flerwering glume with 2 acute 

 teeth and a bent, twisted dorsal aicn : ovary smooth. 



24. A\'ena. — Flowers 2 or more ; flowtriug glume with 2 points 

 and a bent, twisted, terminal awn ; ovary hairy. 



25. Arrhen'athkru.m. — Flowers 2, lower staminate, with long, 

 basal, bent, twisted awn, upper perfect, awnless, or with short, 

 straight awn. 



Tribe 6, Clitoridea-. Spihelets in 2 roias on a flattened rachis. 

 forming a i-sided spil:e or raceme, laterally compressed, i-flowered 



26. CvNODON. — Spikes spreading, digitate : glumes awnless. 



Tribe 7. Festucccv. — Raehilla usually produced : glumes 6 or nuirc, 

 the 2 lowest empty : awn terminal or absent 



27. SiEGi.iNoiA. — Spihelets seldom niore than 3 or (1, in a race- 

 mose panicle, awnless, 2— 4-flowered ; flowering glume with :; 

 minute teeth at the top. 



28. I'iirag.mi'te-. — Spikelcts in a spreading panicle, 1 — 6- 

 llowercd, awnless ; rachilla bearded with long, sifky hairs. 



