Andropogon.] clvii. graminejs (Stapf). 
211 
linear, straight ; lower glume more or less lanceo- 
late to oblong and flat on t he back with frequently 
winged keels and several rather evenly distributed 
intracarinal nerves, one of them usually median (but 
see 2, A. Lima and 9, A. Mannii) ; upper glume 
aristulate from a minute notch ; valvule 0 or very [pogon. 
minute (3, A. distachyus) I. Eu-Andro- 
Culms simple to much branched upwards or branched all 
along and suffrutescent (24, A. cyrtocladus and 25, 
A. Bentii) ; racemes paired or more frequently in 
corymbs or corymboid panicles, more loose to very 
loose ; joints and pedicels mostly filiform to finely 
filiform and then usually somewhat curved ; lower 
glume narrow, mostly linear-lanceolate, with always 
wingless keels, shallowly concave between them and 
without or with only 2 delicate intracarinal nerves, 
one close to each keel (see, however, 18, A. chryso- 
stachyus) ; upper glume acute, rarely produced into 
a minute mucro or small bristle (24, A. cyrtocladus) ; 
valvule present, rather small ... ... II. Leptopogon. 
Joints and pedicels distinctly swollen upwards, clavate or 
cuneate ; valvule always present, distinct. 
Lower glume of^spikelets laterally compressed, wedged 
in between joint and pedicel; its back narrow, 
deeply grooved, the keels often approaching over 
the groove ; upper glume acute or produced into a 
mucro or small bristle III. Piestium. 
At t ** 
Lower glume of A spikelets dorsally flattened, only the 
upper glume wedged in ; its back with a shallow 
median groove ; upper glume neither mucronate nor 
aristulate ; coarse often tall grasses IV. Notosolen. 
I. Ett-Andropogon. 
*Pedicelled spikelets 6 or neuter, or if with an 
(apparently ?) perfect pistil then more or less differ- 
ing in shape from the sessile. 
Leaf-blades rigid, long and very narrow (under 1 lin. 
■wide) with a relatively stout midrib and narrow 
revolute herbaceous sides ; compactly csespitose 
with intravaginal innovations. 
Racemes 2-3 in. long ; sessile spikelets 3-3^ lin. 
long ; intracarinal nerves of lower glume 5-7 
in the sessile, 7-11 in the pedieelled spikelet, [stinus. 
evenly distant ... 1. A.ameiJiy- 
Racemes 3-5 in. long ; sessile spikelets 4-| lin. long ; 
intracarinal nerves 2 on each side, close to the 
keels, without a middle nerve in the sessile, but 
with a middle nerve in the pedieelled spikelet... 2. A. Lima. 
Leaf-blades usually over 1 lin. to 2| lin. wide, with a 
very slender midrib, rarely compactly csespitose. 
f Sessile spikelets 3-54 lin. long, with the" lower glume 
more or less winged at the keels. 
Perennial. 
Sessile spikelets 44~5| lin. long ; cataphylls of 
innovation- buds more or less hairy to villous 3. A. distachyus. 
