CLVII. GRAMINEiE (Stapf). 
[ Digitaria . 
f Racemes sessile or subsessile, sometimes bare at the 
base, but then always with traces of arrested 
spikelets. 
Rhachis of racemes trigonous, laterally winged or 
margined (see also 35, D. angolensis). 
Upper glume 3-nerved, rather different in shape 
and size from the barren valve. 
Hairs fine to very fine, smooth -walled, with 
their tips straight, equally wide or slightly 
wider upAvards and obtuse or tapering to a 
sharp point, rarely abruptly capitellate 
(14, D. capilipila), always very many 
times longer than wide. 
Lower glume generally quite distinct, though 
small, an ovate membranous scale, per- 
sistent if at all developed ; pedicels 
2-nate (sometimes 3-4-nate towards the 
base of the raceme in 4, D. nodosa ) ; 
hairs very fine, equally wide and thin- 
walled throughout, blunt or subacute, 
sometimes mixed with or replaced by 
fine stiff yellowish bristles which spread 
at maturity ; perennial or annual 
Lower glume an extremely delicate hyaline 
colourless mostly truncate and crenulate 
or lobulate membrane disintegrating 
early or altogether suppressed ; pedicels 
2-6-nate, sometimes mixed with very 
short secondary branchlets in the lower 
part of the raceme. 
Racemes solitary ; perennial 
Racemes 2 to oo . 
Indumentum of spikelets short, ap- 
pressed and often scanty or obscure, 
pale tawny, consisting of hairs 
firmer than in the Sanguinales with 
often slightly widened or abruptly 
capitellate tips ; perennial 
Indumentum of spikelets longer, ap- 
pressed (at least before maturity, 
after it sometimes spreading) and 
usually copious along the sides, 
produced beyond the tips of the 
spikelets into a short or long pointed 
tuft, often purplish or bronze colour, 
consisting of somewhat firm, very 
acute hairs ; perennial or annual ... 
Hairs if any (see 24, D. Iburua ) very short with 
obtuse clavate tips, or somewhat longer 
with very acute clavate tips, appressed, 
forming a delicately furfuraceous indu- 
mentum ; pedicelsangularandscabrid with 
usually hispidulous tips ; annual ... 
Upper glume 5-nerved, as long as and generally 
similar to the barren valve which is, however, 
7-nerved ; hairs if any (see 29, D. abyssimca) 
extremely fine, equally wide throughout, 
smooth- walled with curled tips ; perennial 
or annual 
(a) Sanotjinales. 
(6) Monopactylai. 
(c) Calvtjl,.®. 
(i d ) Tricttachne. 
(e) Clavipjlje. 
(/) ClRRIPILAS. 
