108 
CL VII. GRAMESTEiE (Stapf). 
[Sorghum. 
Glumes subacute to obtuse (at least the 
lower) ; panicle oblong, erect, rather 
rigid and dense, branches and branch- 
lets spinulously scabrid § sessile 
spikelets ovate to elliptic or broad- 
oblong, 2J-2f lin. by 1J-1J lin. 12. S. Drummondii. 
Mature spikelets more or less gaping and 
exposing the grain, rarely closed and 
then obovate in outline (16, /S', bicolor). 
Panicles apparently glabrous when young- 
owing to the scanty hairs of the 
glumes and the short cilia of the 
joints and pedicels ; sessile spikelets 
when young flattened on the back, 
greenish, straw-colour or dull tawny, 
ovate- to oblong-lanceolate or ob- 
long, acute or acutely acuminate, 
uniformly coriaceous, awned or awn- 
less ; valves shortly ciliolate ; grain 
shorter than the glumes, or equalling 
or exceding them. 
Mature spikelets with the grain almost 
wholly exposed between the 
widely spreading involute glumes, [involutum. 
3 lin. by lin 13. 8. guineense , var. 
Mature spikelets with the grain em- 
braced below by the tightly ap- 
pressed glumes whose margins are 
not involute. 
Panicles with very slender branches, 
rather loose, sometimes nodding 
and secund in fruit ; spikelets 
lanceolate- to ovate-oblong, 
about 2\ lin. by 1-1^ lin., usually 
awned ; grain shorter than the [ tremulans . 
glumes ... ... ... ... 13. 8. guineense, var. 
Panicles with more robust branches, 
suberect and much contracted 
in fruit ; spikelets rather 
broader, usually ovate- or 
elliptic-oblong, 2|— 3^ lin. by 
lj-l^ lin. in flower, awnless ; \robustum. 
grain exceeding the glumes ... 13. 8. guineense, \ ar. 
Panicles more or less conspicuously hairy, 
sometimes almost villous when 
young ; sessile spikelets with con- 
spicuously ciliate joints and pedicels, 
at length often glabrescent on the 
back which is usually more or less 
convex from an early stage. 
Spikelets ovate or elliptic- to lanceo- 
late-oblong, uniformly coriaceous 
or almost so. 
Spikelets awned ; mature glumes 
sparingly hairy or nearly gla- 
brous and glossy on the back, 
straw-coloured to tawny and 
