ARRANGEMENT OF THE GENERA ACCORDING TO THE 

 NATURAL SYSTEM, 



* Spikelets with 1 fertile terminal flower, with or without a male or imperfect 



flower below it. 



1. ORYZE^E. Flowering glumes hardening, and enclosing the grain ; Empty 

 glumes 4 or 5, unequal, laterally compressed, lower smaller. 1. Ehrharta ; 2. 

 Microlsena. 



2. PHALARIDE^. Flowering glume and palea hardening, and enclosing the 

 grain. Empty glumes 2, equal, laterally compressed, keeled, longer than the 

 flowering. 3. Alopecurus ; 4. Hierochloe. 



3. PANICEJL Flowering glume and palea hardening, and enclosing the grain. 

 Empty glumes 2-4, outer smaller, often dorsally compressed. 5. Spinifex ; 6. 

 Paspalum ; 7. Panicum ; 8. Isachne. 



4. ANDROPOGONE./E. Flowering glume small, thin, transparent, or 0. 9. 

 Zoysia. 



** Spikelets with 1 or more perfect flowers, the male or imperfect flowers, if pre- 

 sent, above the perfect ones, the axis or rachis often ending in a point or bristle. 



5. AGROSTIDE.E. Spikelets, 1 -flowered. Flowering glume, awnless, or with 

 a simple awn, Grain free. 10. Echinopogon ; 11. Dichelachne ; 12. Apera ; 13. 

 Sporobolus ; 14. Agrostis ; 14.2. Deyeuxia. 



6. STIPACEJE Spikelets 1 -flowered. Flowering glume firm, with a simple 

 or 3 cleft awn jointed on to its tip, closely enveloping the grain. 12.2. Stipa. 



7. ARUNDINE^E. Spikelets usually 2-or more flowered, rachis with long 

 silky hairs. Glumes all membranous free. 15. Arundo. 



8. A YEN ACE^E. -Spikelets 2 or more flowered. Flowering glumes on a 

 slender rachis, usually shorter than the empty ones, membranous, shining, split 

 at the top with an intermediate awn that is often twisted at the base, (rarely 

 awnless). 16, Danthonia ; 17, Deschampsia ; 18, Koeleria ; 19, Trisetum. 



9. FESTUCACE.E. Spikelets usually 4 or more flowered. Flowering glumes 

 usually longer than the empty ones, on aflexuous rachis. 20, Glyceria ; 21, Cata- 

 brosa ; 22, Poa ; 23, Festuca ; 24, Bromus. 



10. HORDEACE^E. Spikelets 1 or more flowered (spiked) sessile on opposite 

 sides of a simple rachis, solitary or 2 or 3 together, the glumes standing right and 

 left to the axis of the spike. 25. Triticum. 26. Gymnostichum . 



