Brachiaria .] 
CLVII. GRAMINEA3 (Stapf). 
541 
horizontal secnnd spiciform racemes ; common axis very slender, 
semiterete, channelled adaxillarily or flattened upwards, up to 2 in. 
long, scaberulous along the angles, at least upwards, glabrous. 
Racemes up to almost 1 (rarely 1 J) in. long, 1- or sub-2-seriate, simple, 
moderately dense or loose, sessile or the lowest bare at the base with 
arrested spikelets ; rhachis triquetrous, lin. wide, straight 
or slightly wavy, flat on the back, scabrid along the angles, otherwise 
glabrous or pubescent with or without some fine long hairs ; inter- 
nodes 1-1 J, rarely 2 lin. long ; pedicels solitary, up to over J lin. 
long, angular, scabrid, often with a few long fine hairs, tips not 
thickened. Spikelets discontiguous, ovate- or oblong-lanceolate, 
rostrate-acuminate, somewhat turgid, 2 lin. long, whitish. Glumes 
very unequal ; lower broad- to rotundate-ovate, shortly acute, 
clasping, almost half the length of the spikelet, hyaline, nerves 
7-9, fine, anastomosing upwards ; upper corresponding in outline 
and size to the spikelet, whitish with 5 nerves which are green and 
prominent upwards and connected there by cross-veins, mucronate, 
glabrous or sparingly pubescent, always with a tuft of stiff erect 
hairs on each side at three-quarters from the base. Lower floret 
neuter : valve very similar to the upper glume, but depressed on 
both sides of the midnerve; valvule elliptic-oblong, 1J lin. long, 
with finely scaberulous narrowly winged keels ; lodicules 0. Upper 
floret broad-oblong, acute, slightly over JLJ lin. long, straw- 
coloured ; valve and valvule crustaceous, delicately pitted, flaps of 
the latter almost touching downwards. Stigmas blackish -purple, 
exserted below the tip . — Panicum leucacranthum, K. Schum. in Engl. 
Pfl. Ost-Afr. C. 102. 
Nile Land. British East Africa: Makindu, Linton, 102! Rabat, 400 ft., 
Dowson, 15 ! 
Mozambique Distr. German East Africa : Tanga, in clearings, Holst, 2097 ! 
Sacleux, 2507 ! Amboni, in bush, Holst, 2805 ! 
32. B. xantholeuca. Staff. Annual, up to over 2 ft. high, loosely 
tufted. Culms geniciuately ascending or decumbent and rooting 
at the base, more rarely erect, slender, terete or somewhat com- 
pressed towards the base, few- to about 8-noded, branched, rarely 
quite simple, lower internodes often arching and bared by the slip- 
ping off of the sheaths, usually rather short, the uppermost at length 
long-exserted and much the longest, all softly hairy at least upwards. 
Leaf-sheaths striate, lower loose, upper somewhat tight, more or 
less softly hairy to subtomentose or villous, hairs fine, spreading, 
often rather long, nodes villosulous ; figules a dense fringe of short 
hairs ; blades lanceolate-linear to linear from a slightly and shortly 
contracted base, tapering to a callous acute or subacute point, 1J-4 
in. by 2J-4 lin., flat, somewhat succulent and rigid or subflaccid 
when long, drying yellowish-green, softly pubescent to tomentose 
or velvety on both sides, with some long and fine hairs here and there, 
