p.22

416

30. Apex bifid, awn bent ... 42-Avena
30. Apex multifid ... 39-Aira
31. Paleae with two bristly teeth ... 40-Trisetum
31. Paleae bifid ... 30-Bromus
32. Lower palea entire, fruit coated ... 29-Festuca
32. Awn between two teeth, twisted ... 41-Danthonia
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. Glues equal, longer than the palea ... 47-Phalaris
34. Lower palea truncate-mucronate, inner bifid ... 31-Uniola
34. Flowers silky-bearded on the rachys ... 32-Phragmites
34. Spikelets terete, paleae seven nerved ... 26-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-Festuea
35. Scales and styles three ... 33-Arundinaria
36. Panicle contracted ... 37
36. Panicle large diffuse ... 25-Melica
37. Lower palea one pointed, or mucronate ... 38
37. Lower palea pointless ... 24-Reboulea
37. Lower palea three cleft ... 20-Tricuspis
38. Stamens three ... 23-Koelesia
38. Stamens two ... 21-Diarrhena
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-Lolium
41. Glumes two, in each spikelet ... 34-Triticum
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-Eleusine
43. Spikelets remote short, forming a long slender racime [racine] ... 17-Bouteloua
43. Spikelets conglomerate, or paniculate ... 22-Dactylis
43. Spikes racined, slender ... 19-Leptochloa

TRIBE I. ORYZEAE.

Spikelets one-flowered, sometimes monoecious, in branched panicles;
glumes often wanting or obsolete; inner palea 3-nerved; scales 2; stamens
1 to 6.