GRASS FAMILY 



549 



Sub-order I. Panicdcece. — Spikelets jointed upon the pedicel; 

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

 a perfect flower. 



Tribe i, Panicece. — 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. — Glumcs 4 ; flowering glume 5-veined, mu- 

 cronate or awned. 



■^^3. Setaria. — Glumes 4 ; pedicels of spikelets bristly. 



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



Tribe 2. Oryzece. — Spikelets laterally compressed ; flowering glume 

 and pale 1 -nerved 



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

 absent. 



Sub-order II. Podcece. — Spikelets rarely jointed upon the pedicel; 

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



Tribe 3. Phalaridece. — Spikelets distinctly stalked, laterally com- 

 pressed ; rachilla not produced beyond the uppermost glume ; glumes 

 3 — 6, uppermost only with a perfect flower ; pale absent or 1- 

 nerved. 



6. Phalaris. — Glumes 6, awnless ; stamens 3. 



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



8. HiEROCHLOE. — Glumes 6, 2-awned, 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 glume hardening round 

 fruit ; no awn. 



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

 glume enclosing the fruit. 



12. Mibora. — Spikelets in a i -sided raceme, dorsally com- 

 pressed, awnless. 



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

 glume transparent. 



