Digitaria.'] olvii. gr amines (Stapf). 455 
filiform, triquetrous, f-f lin. wide, angles marginate, scabrid, inter- 
nodes 1J lin. long ; pedicels 2-nate, finely filiform, very unequal, 
the longer up to over 1J lin. long, very angular, scabrid, sometimes 
with obscurely ciliate tips. Spikelets loosely appressed, subimbri- 
cate in flower or usually more loosely disposed, oblong, acute, f-1 
lin. long, pale greyish-green, finely rufously hairy on the sides and 
towards the tips. Lower glume a very minute and usually obscure 
cuff-like hyaline membrane, early disappearing ; upper very thin, 
narrowly lanceolate or narrowly oblong, subacute, distinctly shorter 
than the spikelet (about § lin. long), delicately 3-nerved, with 4 
lines of appressed or loose and obliquely spreading hairs, the tips 
of the latter clavate with a sharp apiculus and usually pale rufous, 
sometimes mixed with much finer, upwards not widened circinate 
hairs. Lower floret : valve oblong, subacute or acute, as long as the 
spikelet, sub-7-nerved, the spaces between the midrib and the inner 
lateral nerves glabrous, turning olive-green, the next outer spaces 
and the margins with lines of clavate acutely apiculate upwards 
pale rufous short hairs, the hairs not or scarcely exceeding the tips, 
up to jo lin. long ; valvule a minute hyaline scale up to f lin. long ; 
lodicules minute. Upper floret as long as the spikelet, lanceolate, 
acute, the back very imperfectly covered by the glume, soon rich 
chestnut-brown, thinly chartaceous, margins of valve whitish, 
contiguous nearly all along. Anthers \ lin. long. 
Upper Guinea. Ivory Coast : Adioukrou country ; Dabou, Chevalier, 
17149 ! Southern Nigeria : along water near Lagos, MacGregor, 210 ! 
24. D. Iburua, Stapf in Kew Bulletin, 1915, 382. Annual. Culms 
erect, over 1 J ft. high, simple, 4-5-noded ; internodes enclosed in the 
sheaths except the uppermost. Leaf-sheaths tight, striate, glabrous, 
smooth, the lower keeled upwards ; ligules membranous, rounded, 
broad, 1-1 \ lin. long ; blades linear, long and finely tapering upwards, 
up to 1 ft. by 5 lin., flat, with some long hairs near the base from 
behind the ligule, midrib slender, primary lateral nerves about 6 
on each side. Raceme subcomposite, 4-10, sessile, digitate, the 
lowest usually somewhat distant from the others which are closely 
crowded, suberect, 5-5J in. long, dense, pale green ; rhachis straight, 
triquetrous, about J lin. wide, angles green, narrowly winged, 
scaberulous ; secondary racemes appressed, up to 2J lin. long, 
bearing up to 5 spikelets ; pedicels 2-5-nate, unequal, the longest 
up to lj lin. long, finely filiform, angular, scaberulous, tips ciliate. 
Spikelets tightly imbricate, elliptic-lanceolate to oblong, acute, 
up to 1 lin. long, J lin. wide when mature, quite glabrous. Lower 
glume a minute hyaline membrane, soon breaking up, or 0 ; upper 
ovate-oblong, subobtuse, lin. long, hyaline, finely 3-nerved. 
Lower floret : valve membranous, as long as the spikelet, 7-nerved, 
the 3 inner nerves parallel, approximate and prominent, the outer 
in pairs at the flexures ; valvule almost microscopic, broad, 
