GRAMINEAE 
401 
lets usually in racemes or spikes which become jointed 
when ripe ; <? and ? spikelets in separate infls. or in separate 
parts of the same infl.): Euchlaena, Zea, Coix. 
II. Andropogoneae (as I, but spikelets $ , or S and ? side by side 
in the same infl.): Saccharum, Andropogon, Sorghum. 
III. Zoysieae (paleae membranous; glumes herbaceous, papery 
or leathery, the lowest usually the largest ; spikelets fall- 
ing singly or in groups from an unjointed spike-axis): 
Zoysia. 
IV. Tristegineae (paleae membranous; glumes herbaceous or 
firm and papery, the lowest smaller or narrower than the 
rest; spikelets falling singly from the twigs of a panicle): 
Arundinella. 
V. Paniceae (paleae usually cartilaginous, leathery or papery; 
glumes more delicate, usually herbaceous, the lowest 
usually smaller ; spikelets falling singly from the twigs of 
a panicle or unjointed spike-axis) : Paspalum, fPanicum, 
tSetaria, Cenchrus, Pennisetum, Spinifex. 
b. Hilum linear ; spikelets laterally compressed. 
VI. Oryzeae: Zizania, Oryza, Lygeum, fLeersia. 
B. Spikelets 1 — many-flowered; when 1 -flowered often with a pro- 
longation of the axis above the fir., their stalks usually jointed 
above the glumes, so that they fall off leaving these on the 
axis; when 2- or more-flowered, always with distinct inter- 
nodes between the firs. 
a. Stem herbaceous, annual. No petiole, or joint between blade 
and sheath. 
VII. Phalarideae (spikelets in panicles, spikelike panicles or 
racemes, on distinct stalks — sometimes very short, not 
set in notches on the main axis ; 1 -flowered, with 4 glumes 
and 1 -nerved sup. palea): fPhalaris, + Anthoxanthum, 
fHierochloe. 
VIII. Agrostideae (as VII, but spikelets with two or no glumes 
and 2-nerved sup. palea) : Aristida, Stipa, + Milium, 
fPhleum, fAlopecurus, tMibora, Sporobolus, tPoly- 
pogon, t Agrostis, fGastridium, fCalamagrostis, t Ammo- 
phila, fApera, tLagurus. 
IX. Aveneae (infl. as VII, but spikelets 2— many-flowered; inf. 
paleae usually shorter than glumes, with twisted awn upon 
the dorsal side, more rarely with no awn or with an awn 
upon the tip as X, but then always with 2 almost opp. 
firs, and no prolongation of the axis beyond them) : 
fHolcus, fAira, tCorynephorus, fDeschampsia, +Tri- 
setum, f Avena, + Arrhenatherum, Danthonia. 
X. Festuceae (as IX, but inf. palea usually longer than glume, 
without awn or with untwisted awn at tip) : + Sesleria, 
26 
\v. 
