ORDER CXLII. GRAMINACEJ3. 571 



19. Inferior flower neutral 20 



Superior flower neutral 22 



20. Flowers with a hair-like involucre Erianthus, 42 



Pale;e of the fertilo flowers coriaceous 21 



Palese membranaceous Andropogon, 43 



21. Paleaj awneol Oplismenus, 12 



Palete not awned Panicum, 10 



22. Spikes by fours, digitate Chloris, 20 



Spikes terminal, simple EottbmlUa, 11 



23. Spikes terminal, simple Cenchrus, 14 



Spikes terminal, compound Setaria, 13 



24. Flowers monoecious 25 



Flowers not monoecious 26 



25. Staminate and pistillate flowers on the same spike Tripsacum, 39 



Staminate and pistillate flowers not on the same spike Zea, 4 



26. Inflorescence paniculate 27 



Inflorescence spicate 40 



27. Lower palea awned 28 



Lower palea not awned 34 



28. Awn at the apex of the palea 29 



Awn at the back of the palea 31 



29. Palea* entire Festuca, 32 



Paleae toothed or divided 30 



30. Awn twisted at the base Danthonia, 26 



Awn straight Uralepis, 27 



31. Awn near the base of the palea 32 



Awn near the apex of the palea Bromus, 33 



82. Palea entire, emarginate Antlwxantlium, 8 



Palea bicuspidate 33 



33. Spikelets 2-flowered Aira, 25 



Spikelets more than 2-flowered Avena, 26 



34. Lower paleae entire 35 



Lower palea? toothed Aira, 25 



35. Spikelets 2— 3-flowered 36 



Spikelets usually more than 3-flowered 37 



86. Palea} 4 Phalaris, 7 



Palese 2 Melica, 29 



37. Spikelets flat, ancipital Uniola, 34 



Spikelets cordate Briza, 30 



Spikelets ovate 38 



38. Palese herbaceous 39 



Paleae membranaceous Poa, 23 



39. Lower palea many-nerved Arundinaria, 35 



Lower palea few-nerved Festuca, 32 



40. Spikes paniculate 41 



Spikes (iigitatc Eletisine, 21 



Spikes single 42 



41. Spikes short Daciylis, 31 



Spikes long Eleusine, 21 



42. Glumes wanting Elymu.% 37 



Glumes present 43 



43. Palea? awned below the summit Monoccra, 22 



Paleas not awned below the summit Elymus, 37 



Tribe L— ORY'ZE^E. 



Spikelets 1-flowered. Flowers often monoecious, in branched 

 panicles. 



