30. Apex bifid, awn bent. 42 A vena 
30. Apex multifid... 3!) Aira 
31. Paleae with two bristly teeth. 40 Trisetoii 
31. Paleae bifid. 30 Bromus 
32. Lower palea entire, fruit coated.. 29—Festuca 
32. Awn between two teeth, twisted.. 41 — Dantbonia 
33. Terminal flower perfect... 34 
33. Terminal flower abortive, or a mere pedical. 36 
34. Paleae entire, outer one mucronate.35 
34. Glumes very unequal, resembling the lower abortive palea.50 — Panicum 
34. Glumes equal, longer than the palea.. 47 —I’iialaris 
34, Lower palea truncate-mucronate, inner bifid. 31—Uniola 
34. Flowers silky-bearded on the rachys.32—Phragmites 
34. Spikelets terete, paleae seven nerved. 2 G—Glyceria 
34. Spikelets two to six, five nerved. 27 —Poa 
34. Spikelets two to twenty, three nerved. 28 — Erogrostis 
35. Scales two—styles two. 29—Festuca 
35. Scales and styles three .. 33—Arundiuaria 
36. Panicle contracted... 37 
36. Panicle large diffuse. 25 —Mf.lica 
37. Lower palea one pointed, or mucronate.. 38 
37. Lower palea pointless. 24 —Heboulea 
37. Lower palea three cleft.....20—Tricuspis 
38. Stamens three..........23—Koelesia 
33. Stamens two. 21—Diarrbena 
39. Spikelets two-ranked. 37 
39. Spikelets unilateral..43 
40. Glumes broad. 41 
40. Glumes subulate.42 
41. Glumes two, in the upper spikelet only. 35—Folium 
41. Glumes two, in each spikelet. 34—Tritieura 
42. Glumes collateral, spikelets in twos or more. 36—Elymus 
42. Glumes opposite, spikelets solitary. 38—Secale 
43. Spikes digitate—spikelets in two rows. 18—Elcusine 
43. Spikelets remote short, forming a long slender racime.... 17—Bouteloua 
43. Spikelets conglomerate, or paniculate. 22—Pactylis 
43. Spikes racined, slender. 19—Leptocliloa 
TRIBE I. - ORYZEAE. 
Spikelets one-flowered, sometimes monoecious, in branched panicles; 
glumes often wanting or obsolete ; inner palea 3-nerved ; scales 2; sta¬ 
mens 1 to 6. 
