Graminaceae 37 
FF. Spikelets without sterile lemmas just above the glumes. 
AGROSTEAE (p. 40) 
EE. Spikelets 2 to many flowered, in racemes or panicles. 
G. Glumes usually longer than the first flower; | or more of the lemmas 
awned on the back or between the teeth of the bifid apex. 
AVENEAE (p. 50) 
GG. Glumes shorter than the first flower; lemma either awnless, or with 1 
to several terminal straight or merely divergent awns. FESTUCEAE (p. 53) 
DD. Spikelets in 2 rows. 
H. Spikelet-rows on same side of rachis, forming 1-sided spikes. 
CHLORIDEAE (p. 67) 
HH.  Spikelet-rows on opposite sides of rachis, forming balanced spikes. 
HorpDEAE (p. 68) 
ANDROPOGONEAE (Sucar-caNE TRIBE)—Spikelets |—3 at each joint 
cf the rachis, sessile or short-pedicelled, usually 3-flowered. Glumes 2, thicker than 
the lemmas. Lemma often hyaline, often awned, the lower often empty and glume- 
like. Palet usually shorter than its lemma, sometimes none. Stamens 1|—3. Stigma 
plumose. Grain unfurrowed, free (ours). 
A. Spikelets in a spike-like panicle, in 2’s, all fertile; lemma awnless; stamens |—2. 
IMPERATA (p. 37) 
AA. Spikelets in a loose somewhat spreading panicle, in 3’s, lateral 2 sterile, central 
| fertile; lemma awned; stamens 3. SORGHUM (p. 37) 
IMPERATA 
Perennial. Spikelets in a spike-like panicle, usually in pairs (so in ours). both 
perfect. Glumes awnless, hairy; hairs thin, 12 mm. long (ours). Lemmas hairless, 
awnless, upper smaller than the lower. Palets usually truncate and jagged at tip. 
eiamenssI-—2. (Ongin >)” E. 
I. hookeri Rupr. (Western Blade-grass) 
SORGHUM 
Annual or penennial (ours), 9—20 dm. high (ours). Leaves long, wide, tat, 
4—6 mm. wide (ours), appressed-pubescent (ours). Spikelets in a large terminal pan- 
icle, in pairs at its nodes or in 3’s (ours) at the ends of its branches, | sessile and 
perfect at each node, the lateral | or 2 pedicelled and staminate or empty. Glumes 
shinmg. Lemma hyaline, awned; awn 8—16 mm. long (ours). Palet hyaline or 
none. Stamens 3. (Sorghi—the name in India.) W. 
S. halapense Pers. (Johnson-grass) 
PANICEAE, (MILLet TrIspE)—Spikelets in spikes or racemes or panicles, fall- 
ing off singly from the ultimate branches; fertile spikelet with | terminal pistillate flower, 
with or without a staminate one below it. Glumes rarely awned, the awn straight. 
Lemma and palet firmer than the glumes, unawned in most. Stamens 3, rarely fewer. 
Grain enclosed, free, unturrowed. 
A. Spikelets in |-sided spikes or spike-like racemes. 
B. Lemmas not awned; glumes not spiny-hispid, hence spikes or spike-like racemes 
not bristly. 
C. Annual; lower glume very small; lemma with hyaline margin, not inrolled. 
SYNTHERISMA (p. 38) 
