GRAMINEJ3. 
429 
Spikelets one or more subtended by an involucre of bristles 
or scales. 
Hypogynous scales 0 or very minute. 
Involucre of united lanceolate scales 5. Cenchrus. 
Involucre of plumose bristles 6. Pennisetum. 
Hypogynous scales distinct. 
Involucre falling with the spikelet 7. Gymnothrix. 
Involucre not falling with the spikelet 8. Setaria. 
Tribe III. Andropogone^). Empty glumes firm in texture and 
enclosing the membranous flowering glume and pale. Flowers usually 
2 in the most complete spikelets, the lower imperfect. 
Inner empty glume abortive 9. Zoysia. 
Both the empty glumes present. 
Flowers in pairs, both perfect * Saccharum. 
Flowers in pairs, the pale of the imperfect one absent. 
Grain small 10. Andropogon. 
Grain comparatively large * Sorghum. 
Flowers in pairs, the pale of the imperfect one present . 11. Ischcemum. 
Flowers many in a cluster, only one perfect 12. Anthistiria. 
Series II. Euryanthese. Spikelets open in flower. Styles short 
Rudimentary flowers, if present, placed usually above the perfect, 
ones. 
Tribe IY. Oryze-E. Empty glumes absent. Spikelets 1-flowered, 
panicled. 
The only genus 13. Leersia. 
Empty glumes 2. (Tribes v-ix). 
Tribe Y. Agrostidea:. Spikelets 1-flowered, panicled. 
Awn 0 14. Vilfa. 
Awn simple, dorsal 15. Agrostis. 
Awn trifid, terminal 16. Aristida. 
Tribe YI. Chlorides. Spikelets 2- or many-flowered, arranged in 
secund simple or digitate spikes. 
Glumes all without awns. 
Obvious flower one only, the other represented by a 
pedicel 17. Cynodon. 
Obvious flowers several 18. Eleusine. 
Some of the glumes awned. 
Spikes solitary 19. Ctenium. 
Spikes two or more. 
Spikelets very dense, spreading 20. Dactyloctenium. 
Spikelets less dense, erecto-patent ® 21. Chloris. 
Tribe VII. Eestucea:. Spikelets many-flow'ered, pauicled. Herbs. 
Flowers placed in a tuft of hair 22. Phragmites. 
Flowers not placed in a tuft of hair. 
Grain free from the pale. 
Flowers webbed * Poa. 
Flowers not webbed 23. Eragrostis. 
Grain adhering to the pale • • * Briza. 
