CLASSIFICATION. 87 



besides the outer empty glumes. Genera:— 4. Hiero- 

 chloe; 5. Anthoxanthum ; 6. Phalaris; 7. Digraphis. 



Group II. VOJEAC&m. 



Spilcelets tvith one or more perfect flowers, the male or rudi- 

 mentary flowe?*s, if any, terminal. 



Tribe 4. Agrostidess. Spikelets one-flowered, usually 

 pedicellate. Genera: — 8. Phleum ; 9. Alopecurus ; 

 10. Chamagrostis; 11. Lagttrus; 12. Polypogon ; 

 13. Agrostis; 14. Gastridium; 15. Psamma; 16. 

 Calamagrostis. 



Tribe 5. Aveness. Spikelets two- or few-flowered, 

 pedicellate. Flowering glumes usually longer than the 

 outer ones, their awns often bent or twisted. Genera : 

 — 17. Aira; 18. A vena ; 19. Arrhenatiierum; 20. 

 Holcus. 



Tribe 6. Chloridese. Spikelets one- or several-flow- 

 ered, sessile along one side of the simple linear branches 

 of the panicle. Genera: — 21. Cynodon ; 22. Spartina. 



Tribe 7. Hordeinese. Spikelets one- or several-flow- 

 ered, sessile in the notches of a simple spike. Genera : 

 — 23. Lepturus; 24. Nardus ; 25. Elymus; 26. 

 Hordeum; 27. Triticum; 28. Lolium ; 29. Brachy- 

 podium. 



Tribe 8. Festucese. Spikelets several- flowered, pedi- 

 cellate. Awns, if any, straight. Genera: — 30. Bro- 

 mus; 31. Festuca ; 32. Dactylis ; 33. Cynosurus ; 

 34. Briza; 35. Poa; 36. Catabrosa; 37. Molinea; 

 38. Melica; 39. Triodia ; 40. Kceleria ; 41. Ses- 

 leria; 42. Arundo. 



GEJSTERA AND SPECIES. 

 Genus 1. Leersia. Glumes two, concave, boat- 



