GRAMINEJE. 428 



affinities of these plants, the nature of their styles and stigmas appears to 

 remove them from the great tribe of Poacece. 



SERIES I. CLISAN'THE^E, Fries. Spikelets closed in flower. Styles usually 

 elongate, stigmas slender, with short or long simple hairs, protruded at 

 the top of the fl. glume. 



TRIBE I. PANICE'^E. Spikelets dorsally compressed, articulate below 

 the lowest glume, hence wholly deciduous. Lowest empty glume small 

 or ; '2d larger ; 3d glume with a palea and male fl. or ; 4th with a 

 palea and 2-sexual flower, hardening round the fruit. 



Spikelets with soft hairs on the pedicels or 1. Panicum. 



Spikelets with stiff bristles on the pedicels 2. Setaria. 



TRIBE II. PHALARIDE'JE. Spikelets laterally rarely dorsally com- 

 pressed, usually articulate above the 2 empty glumes, which are hence 

 persistent. Empty glumes large (0 in Nardus). 



* Spikelets I-fld. ; with no rudiment of a 2dfl. glume. 



Spikelets in 1 unilateral spike ; empty glumes 3. Nardus. 



Spikelets in 2 or more unilateral spikes ; empty glumes 2 4. Spartina. 



Spikelets in 1 sub-distichous spike ; empty glumes 2 5. Chamagrostis. 



Spikelets in a cylindric close panicle ; palea 1 6. Phleum. 



Spikelets in a cylindric close panicle ; palea 7. Alopecurus. 



** Spikelets 1-3-fld. ; upper fl. alone 2-sexual. 



Fl. glumes 3, upper 2-sexual, 2 lower rudimentary 8. Phalaris. 



Fl. glumes 3, upper 2-sexual, 2 lower large empty 9. Anthoxanthum. 



Fl. glumes 3, upper 2-sexual diandrous, 2 lower male 10. Hierochloe. 



*** Spikelets 3 fid. , upper fl. imperfect 11. Sesleria. 



SERIES II. EURYANTH'E^E, Fries. Spikelets open in flower. Styles usually 

 short or 0, stigmas long or short with long spreading hairs (feathery), 

 protruded at the sides or base of the fl. glume. 



TRIBE III. POA'CE.ffi. Spikelets 1- or more-flowered, articulate above the 

 empty glumes, which are hence persistent (except Holcus). Lowest 

 or all the flowering glumes 2-sexual (except in Phragmites and A vena 

 Arrhenatherum), upper often male or rudimentary or reduced to a 

 pedicel at the back of the palea. 



SUB-TRIBE Agrostide'se. Spikelets 1-fld., with sometimes a rudimentary 

 upper glume. Empty glumes 2, conspicuous. Fl. glumes often awned. 

 * Fl. glumes with few or no basal hairs. 



Empty glumes membranous, awnless ; fl. membranous 12. Agrostis. 



Empty glumes coriaceous, awnless; fl. hard 13. Milium. 



Empty glumes membranous with simple awns 14. Polypogon. 



Empty glumes membranous with feathery points 15. Lagurus. 



Empty and fl. glumes rigid, coriaceous, awnless 16. Psamma. 



** Fl. glumes enveloped in silky hairs. 



Hairs longer or shorter than the glumes 17. Calamagrostis. 



SUB-TRIBE Oryze'se. Spikelets 1-fld. Empty glumes or rudimentary. 

 A wn if present never twisted. 



Fruit adnate to the rigid flowering glume and pale 18. Leersia. 



SUB-TRIBE Chloride'se. Spikelets 1-fld., on the underside of .a flat un- 



jointed rachis (spike). Au-n if present not twisted. 

 Spikes digitate, spikelets minute 19. Cynodon. 



