10 (iii.vMiNEAE (GRASS FAMILY) 



Tribe in. PANICEAE 



Spikelets without a subtending involucre of bristles or valves. 

 .Icil racemes or spikes. 



dome well developed 6. Paspalum. 



First ulumf small or abortive. 



Plant annual 7 - Syntherisma. 



r p.-rennial 8 - Brachiaria. 



Spikek'ts not in one-sided racemes or spikes. 



Glumesswned 9. Echinochloa. 



(Uumesnotawned 10. Panicum. 



Spikch-ts inviilut-rate. 



The involucre consisting of bristles 11. Chaetochloa. 



The involucre consisting of spine-bearing valves forming a bur . 12. Cenchrus. 



Tribe IV. ORYZEAE 

 Flowers? perfect; glumes wanting 13. Homalocenchrus. 



Tribe V. PHALARIDEAE 



Uppermost floret perfect, the others empty 14. Phalaris. 



Uppermost floret perfect, the others staminate . . . .15. Hierochloe. 



Tribe VI. AGROSTIDEAE 



Lemma with a long terminal awn, and closely embracing the grain. 

 Spikelets not in pairs. 



Fruiting lemma thin and membranous 20. Muhlenbergia. 



Fruiting lemma firm and indurated. 



Awns 3-branched 16. Aristida. 



Awns simple. 



Twisted, persistent on the lemma 17. Stipa. 



Straight, deciduous from the lemma. 



Lemma glabrous or appressed-pubescent . . .18. Oryzopsis. 



Lemma long silky-pubescent 19. Eriocoma. 



Spikelets paired, in a spike-like raceme 21. Lycurus. 



Lemma awnless or short-awned, and loosely investing the grain. 

 Inflorescence a dense spike. 



Spikelets persistent; lemma awnless or with a short terminal awn. 



Spikes cylindrical ' . .22. Phleum. 



Spikes ovoid 27. Polypogon. 



Spikelets early deciduous; lemma with a dorsal awn . . 23. Alopecurus. 

 Inflorescence a loose panicle. 



Pericarp discharging the seed at maturity. 



A diminutive alpine perennial ...... 24. Phippsia. 



Larger and mostly at middle and lower altitudes. 



Nerves of lemma not pilose 25. Sporobolus. 



Nerves of lemma pilose 26. Blepharineuron. 



Pericarp permanently investing the seed. 



1'alct 1-nci vr.l; stamen 1 28. Cinna. 



r.-ilci L'-ncrvctl; stamens 3. 



Lemma naked at the base 29. Agrostis. 



l.cmma with a tuft of long hairs at the base. 



Thin-membranous ....... 30. Calamagrostis. 



Chartiiceous ......... 31. Calamovilfa. 



Tribe VII. AVENEAE 



Awn </f the lemma <lorsal. 



in. long. 

 '' ' iiM.it i ........ 32. Deschanapsia. 



J.i-mnia 'J t<.<,thed. with awn twisted and bent .... 33. Trisetum. 



Minn- than I ''in. ln^ ....... 35. Avena. 



\\\n -if the lemma terminal, between the teeth . . 36. Danthonia. 





