ORDER CXLII. fJRAMINACEJ::. 571 



19. Inferior flower nontrnl 20 



Sujjcrior flower neiural 'j'i 



20 F owers wth a h 'ir-like involucre Erianthun, 42 



Pa'eae of ti)f f rtiii* tlowera rori.ici-ous 21 



I'a e* iniMnbraiiacC'Ous i wlrnpogon, 43 



21. Pnloie awn.'fl OpUxm^n ut, 12 



PaloiB not awned /'atiicuiii, 10 



22. Spil^os by fours, digitate Chloriit, 20 



Spikes terminal, simple UaWnxWui, 1 1 



23. Spikes terminal, simple Cenrhrun, 14 



Spikes terminal, compound Setaria, 13 



24. Flowers monoecious 25 



Flowers not moncecious 26 



25. Staminate an<l pistillate flowers on the same spike Tripsacum, 89 



Staminate and pi>tillate flowers not on the s^ame spike Zea, 4 



26. Inflorescence paniculate 27 



Inflorescence spicate 40 



27. Lower palea awned 23 



Lower palea not awned S4 



28. Awn at the apex of the palea 29 



Awn at the back of the palea 81 



29. Palea) entire Festuca, 32 



Palea; toothed or divided 30 



30. Awn twisted at the base Danthnnin^ Grt 



Awn straight UralejAn, 27 



81. Awn near the base of the palea 32 



Awn near the apex of the palea Bromus, 83 



82. Pa'ea entire, emarginate , Anthoxanthum, 8 



Palea biciisi)idatc '. 83 



33. Spikelets 2-flowered Aim, 25 



Spikelets more than 2-flowered Arena, 20 



34. Lower palea? entire 85 



Lower palea; toothed A irti, 25 



35. Spikelets 2— .3-flowered 36 



Spikelets usually more than o-flo\vered 87 



86. Palea? 4 P/iafnrut, 7 



Palea; 2 JMica, 29 



37. Spikelets flat, ancipital Unio/a, 84 



Spikelets cordate Brua, 8t' 



Spikelets ovate 89 



8S. PaleJB herbaceous 89 



Paleae membranaceous Poa, 23 



.89. Lower palea many-nerved A rundinarin, 85 



Lower palea few-nerved Ffetuca, 82 



40. Spikes paniculate ■ll 



Spikes digitate K/fu^inf, 21 



Spikes single *'i 



41. Spikes short D>trt>/liA, 81 



Spikes long EUuaine^ 21 



42. Glumes wanting Elt/tnu*, 87 



Glumes present ^ 



43. PaleiB awned below the summit Monovcra, 22 



Palea; not awned below the summit Elt/mus, 87 



TuiDE I.— ORY'ZEiE. 



Spikelets 1 -flowered. Flowers often monacious, iii branched 

 panicles. 



