315 
4. Spikelets two to many flowered. 
5. Flowering glumes usually shorter 
than the empty ones, usually with 
a bent awn on the back, rarely 
awned from the apex 
5. Flowering glumes generally longer 
than the empty ones, unawned, or 
with a straight awn from the apex.. 
3. Spikelets in two rows. 
4. Spikelets crowded on one side of the con- 
tinuous rhachis, forming one-sided spikes 
or racemes 
4. Spikelets in two opposite rows of the often 
articulate rhachis, forming equilateral 
spikes 
2. Stems woody ; leaf-blade with a petiole-like base which is 
articulated with the sheath 
Tribe I. MAYDE^. 
l.Staminate spikes numerous in terminal panicles; pistillate 
spikes in the axils of the leaves subtended by large 
membranous bracts at the base. 
2. Pistillate spikes of each leaf-axil free, articulated.... (1) 
2. Pistillate spikes of each leaf-axil grown together 
into a continuous, compound, and much thickened 
axis - (2) 
l.Staminate spikes solitary at the ends of the branchlets ; 
pistillate helow, one to two, each of them reduced to a 
single spikelet entirely inclosed by the ovoid or spher- 
ical, ivory-like sheath of the subtending bract (4) 
1. Staminate and pistillate spikelets in the same spike, 
the lowest glume of the pistillate spikelets indurated.... (3) 
I'rilie IT. ANDROPOGONEiE. 
1 . Spikelets homogamous, hermaphrodite ; joints of the rha- 
chis not much thickened nor excavated lor the reception 
of the spikelet. 
2. Axis of the racemes continuous. 
3. Spikelets solitary, disposed in several slender 
unilateral racemes (5) 
3. Spikelets in pairs, rarely in threes, upon 
each joint of the rhachis, paniculate. 
4. Racemes in a narrow, usually spike- 
like panicle; spikelets awnless (6) 
4. Racemes in a hoard panicle ; spike- 
lets usually awned (7) 
2. Axis of the racemes articulate. 
3. Racemes solitary, terminal. 
4. Spikelets in pairs at each joint of 
the rhachis (11) 
4. Spikelets in threes at each joint of 
the rhachis (10) 
3. Racemes two to many, digitate or approxi- 
mate on a shortened main axis. 
4. Spikelets one, rarely two-flowered ; 
when two flowered the first empty 
glume with a median longitudinal 
furrow (9) 
4. Spikelets two-flowered, the first empty 
glume without a longitudinal furrow.. (15) 
3. Racemes in a much-branched panicle upon 
an elongated main axis, the lateral racemes 
sessile 
IX. Avene,® 
XI. Pestuce,® 
X. CHLORIDE/E 
XII. Horde,® 
XIII. Bambu-se,® 
EuvUlacna 
Zca 
Coix 
Chionactine 
Dimer ia 
Imperata 
M iscaiith us 
Pogonatherum 
Polijtrias 
Pollinia 
Ischacinum 
(8) Sacchariim 
