110 
cl vii. GBAMiNEiE (Stapf). [Sorghum. 
H Mature glumes thinly crustaceous to papery, the 
tips brittle and breaking irregularly, at least 
from the middle upwards, nerves of the 
lower more or less raised, hence back of 
spikelets longitudinally striate (nos. 20-24). 
Sessile spikelets 3-4 lin. long, lanceolate - 
oblong to narrowly- oblong in flower ; 
lower glume ovate to ovate-elliptic when 
mature : pedicelled spikelets long, per- 
sistent, 3|— 4£ lin. long. 
Grain much shorter than the pale papery 
glumes, completely enclosed by them 20. S. pdpyrascens. 
Grain as long as the black subcrustaceous 
gaping glumes, showing between them, 
white 21. S. melaleucum. 
Sessile spikelets 2J-3 lin. long ; pedicelled 
spikelets up to 3 lin. long. 
Sessile spikelets ovate-oblong, very acute, 
3 lin. long, thinly coriaceous below 
the middle, papery above, sometimes 
with an obscure impressed trans- 
verse line, separating the coriaceous 
and papery portions ... ... ... 22. S. Ankolib. 
Sessile spikelets broad-oblong or ovate in 
outline, shortly acute or subobtuse, 
under 3 lin. long. 
Sessile spikelets ovate in outline ; 
lower glume coriaceous up to the 
middle or at the base only, with 
broad tips, whitish- villous all over 
or glabrous on the coriaceous por- 
tion of the back, whitish when 
mature; panicles often recurved ... 23. S. cernuum. 
Sessile spikelets oblong or ovate in out- 
line ; lower glume thinly coria- 
ceous at the base with a broad de- 
pressed transverse zone around it, 
tip shortly acute or subobtuse. 
Seeds moderately compressed, not 
umbonate ; lower glume of the 
mature sessile spikelets 2 lin. 
broad, acutely triangular from 
the middle upwards ... ... 24. S. subglabrescens. 
Seeds lenticular, umbonate below 
the top ; lower glume of the 
mature sessile spikelet broad, 
oblong (sides rather straight), 
lin. broad, tip less conspicu- 
ously or obscurely triangular, 
constricted transverse zone often [ umbonatum . 
obscure ... ... ... ...19.$. caudatum, var. 
Primary branches of panicle simple ; racemes ter- 
minal ; sheath-nodes (at least the upper) with 
long spreading beards (nos. 24-27). 
Lower glume of sessile spikelets wholly coriaceous 
and at length black, excepting the very base 
and tip. 
