XIV. SYSTEMATIC DESCRIPTION OF THE ORDER GRAMINE^E. 



b Panicle effuse or contracted. 



Flowering glume on a bearded pedicel, tip 2-fid, awned. . 11. Dichelachne. 



Flowering glume pedicelled, ending in a long rigid awn. . 12. Apera. 



Flowering glume sessile, short, acute ; seed loose in pericarp, 13. Sporobolus. 



Flowering glume sessile, truncate, awned at back or awnless 14. Agrostis. 



Flowering glume pedicelled, with a short dorsal awn . . 14. 2 . Deyeuxia. 

 Flowering glume rigid, rolled round the flower, awn bent and 



articulated . . , 12. J . Stipa. 



III. Empty glumes 2, below the 2 or more flowering ones. Flowering glumes 

 rarely 1 in Poa, Danthonia, and Deschampsia. 



a. Flowering glumes awned, sometimes awnless in Hierochloe (see Festuca in 6). 



Flowering glumes 2-5, silky ; awn at the 2-fid tip, slender. . 15. Arundo. 

 Flowering glumes 2-8, 2 cuspidate, with stout dorsal awn, 



and long hairs on sides and at base . . . .16. Danthonia. 

 Flowering glumes 2-4 silky, at base, 3 awned, middle one 



longest . 19. Trisetum. 



Flowering glumes 2 or 3, shining, truncate, or 4-toothed. . 17. Deschampoia. 

 Flowering glumes 3, shining, obtuse, 2 lateral male flowers 



3-androus, central flower, male and female, 2 androus 4. Hierochloe. 

 Flowering glumes 3-7, shining, 2-fid, with a short obtuse 



awn, or 0. Panicle spiciform. . . . . .18. Koeleria. 



Flowering glumes 4-10, 2-fid, with an intermediate awn. 



Ovary villous at top. ... . . 24. Bromus. 



6. Flowering glumes not awned except in some Festucas, (see Hierochloe and 



Koeleria in a). 



Flowering glumes 6-14, short, obtuse, green, Scales connate. 20. (jlyceria. 

 Flowering glumes 2, short, truncate, erose, membranous. . 21. Catabrosa. 

 Flowering glumes 2-10, compressed, keeled, obtuse or acute 22. Poa. 

 Flowering glumes 2-10, convex or keeled at back, often 



awned at the entire tip. . . . . . .23. Festuca. 



