GRASS FAMILY 549 



Sub-order I. Pan icdcccE.-S pikelets jointed upon the pedicel; 

 rachilla persistent; glumes i — 4, only the uppermost enclosing 

 a perfect flower. 



Tribe 1. Paniceee. — Flowering glume 3- or more-nerved, 

 not awned 



I. DiGiTARiA. — Glumes 4 ; pedicels of spikelets naked or hairy; 

 flowering glume 3-veined, not awned. 



*2. EcHiNOCHLOA. — Glumes 4 ; flowering glume 5-veined, niu- 

 cronate or awned. 1 



*3. Ski k-M.\.~ Glumes 4 ; pedicels of spikelets bristly. 



4. Spartina. — Glumes 3 ; spikes upriglit, in a raceme. 



Tribe 2. Oryzece. — Spikelets later eilly compressed ; flowering glume 

 and pale 1 -nerved 



5. Leiorsia. — Spikelets in a loose panicle ; empty glumes 

 absent. 



Sub order 11. Podcece. -Spikelets rarely jointed upcn the pedicel : 

 rachilla deciduous ; glumes 3 or more, the two lowest empty 



Tribe 3. PhalaridecB. — Spikelets distinctly stqjked, laterally com- 

 pressed ,■ rachilla not produced beyond the uppermost glume ; glumes 

 3 — 6, uppermost only with a perfect flower ; pale absent or i- 

 nerved. 



6. Phalaris. — Glumes 6, awnless ; stamens t,. 



7. AnthoxXnthum. — Glumes 6, 2-awned ; -stamens 2. 



8. Hierochl6k. — Glumes 6, 2-avvned, with 3 stamens each ; 

 uppermost perfect flower with 2. 



9. Alopecurus. — Spikelets jointed on the pedicel in a spike- 

 like panicle ; glumes 3 or 4 ; flowering glume with dorsal awn ; 

 stamens 3. 



Tribe 4.. Agrostidece. — Spikelet i-flowered ; glumes 3 ; flower 

 perfect ; pale 2-nerved 



* Rachilla not produced beyond flowering glume 



10. Milium. — Panicle loose ; flowering gluine hardening round 

 fruit ; no awn. 



II. Phlehm. — Panicle dense, cylindric, spike-like; flowering 

 glume enclosing the fruit. 



12. Mii;6ra.' — Spiiteleti in a i-sided raceme, dorsally com- 

 pressed, awnless. 



13. Agkostis. — Panicle loose; spikelets very small; flowering 

 glume transparent. 



