at 
Stamens three, rarely two; two persistent glumes 
below the articulation, two inner ones enclos- 
ing the grain, two intermediate ones small 
or enclosing male flowers. 
Panicle loose. Intermediate glumes enclosing 
male flowers with two-nerved palex ... 47. Hierochloe. 
Tribe V.i—StrerTatHER®.—Spikelets with one, two, or rarely several 
bisexual flowers, and rarely a male flower above or below. Flowering glume 
usually bearing an awn twisted in the lower part, bent or divided about the 
middle. Palea two-nerved, usually thin or small, in afew Avenacez as large 
as in Festucacee. 
(The awnis very smalland straight or deficient in a few species of Agrostis 
and Deyeuxia, the twisted portion below the branches very short or obsolete 
in one section of Aristida.) 
Subtribe I.—Stipaceze.—Spikelets one-flowered. Awn terminal, simple or 
three-branched. lLodicules three. Fruiting glume usually narrow, ‘hardened, 
enclosing the grain. 
Awn three-branched _... ds, au ... 48. Aristida. 
Awn simple, at length articulate on the glume ... 49, Stipa. 
Subtribe I1.—Agrostidez.—Spikelets one-flowered. Awn either terminal 
between the lobes of the glume or dorsal, in a few species very small or 
deficient. Lodicules two. Fruiting glume enclosing the grain, usually thin. 
Awn terminal between the lobes of the glume (two 
on each side), rhachis of the spikelet not 
continued beyond the flower ath . 51. Pentapogon. 
Awn more or less dorsal, sometimes minute or deceit 
No bristle continuing the rhachis beyond the 
flowering elume. 
Awn fine and near the tip of the glume. 
Paleamorethanhalfaslongastheglume. 53. Dichelachne. 
Awn dorsal or none. Palea not more than 
half the length of the glume or minute 
or none ... . 54, Agrostis. 
Rhachis of the spikelet serie Fodaeed ey a 
point or bristle beyond the flower or 
bearing an empty glume. Awn various. 
Palea more than half as long as the 
glume... : ... 55. Deyeuxia. 
Subtribe III. _-Avenacem,—Spikelets mith bah or ina few genera more 
than two perfect flowers (only one in Anisopogon), the rhachis produced 
above them (except in Aira). Awn either dorsal or terminal between the 
lobes of the glume. Grain enclosed in the glume and palea, and sometimes 
adnate. 
Awn dorsal. 
Flowers both bisexual, the rhachis not at all or 
scarcely produced. Grain adnate ... 56. Aira. 
Flowering glumes keeled. Two or three perfect 
flowers. 
Awns attached below the middle. Grain free 59. Deschampsia. 
Awns attached above the middle, grain free, 
glabrous... ie * as ... 60. Trisetum. 
