56 
CLVII. GRAMINEiE (Stapf). 
[ Hemartlnria . 
Hack, in DC. Monogr. Phan. vi. 286 ; Durand & Schinz, Consp. FI. 
Afr. v. 699 ; K. Schum. in Engl. Pfl. Ost-Afr. C. 96 ; Hook. f. FI. 
Brit. Ind. vii. 153 ; Stapf in Dyer, FI. Cap. vii. 329. R. fasciculata, 
Lam. Illustr. i. 204 ; Desf. FI. Atl. i. 110, t. 36. Lodicularia fasci- 
culata, Link, Hort. Berol. i. 6. L. capensis, Nees, FI. Afr. Austr. 
128. Lepturus fasciculata, Trin. Fund. Agrost. 123. 
North Central. Lake Chad : Kouri Archipelago, Chevalier, 10169 ! 
Nile Land. British East Africa : Nairobi, Linton, 10 ! 
Mozambique Distr. Portuguese East Africa : Zambesi Delta, Kongone 
River, Kirk ! Lower Buzi River, Swynnerton, 1566 ! Nyasaland : Elephant 
Marsh, Kirk ! Milauri, Scott ! Rhodesia : Leshumo valley, Holub ! 
Throughout Africa in the Mediterranean region and in America (here probably 
introduced). 
The specimens from Lake Chad have the characteristic almost spindle-shaped 
spikes of the Algerian type and altogether agree well with the typical form ; 
those from Nairobi have compressed-cylindric spikes, resembling those of the 
Indian H. compressa, Linn, f., but stouter and with the spikelets of II. fascicu- 
lata. Holub’s specimen represents an erect form with rigid long leaves and 
long cylindric spikes, as is frequently found among the South African material. 
As the specimens are mostly collected without the bases and unaccompanied 
by notes, the determination of the specimens referred here to H. fasciculata 
must to some extent remain open to doubt. 
2. H. natans, Stapf. Perennial. Culms 15 to 25 ft. long, often 
floating, very many-noded, somewhat compressed, glabrous, barren 
internodes as far as seen short, 1 J-l-J in. long, ra,ther stout, exceeded 
by the sheaths, uppermost 5-6 internodes somewhat elongated, 
exserted from the sheaths with inflorescences from their axils. Leaf- 
sheaths somewhat compressed and keeled, at least the lower, rather 
loose, sparingly ciliate towards the mouth, otherwise glabrous ; 
ligules membranous, very short, ’with cilia 1 lin. long ; blades linear 
from a slightly wider base, shortly acute, the upper up to 3 in. long 
and 3 lin. wide at the base, flat, rigidly white-ciliolate from the 
middle upwards, otherwise glabrous. Bacemes fascicled, mostly 3 
from a node, straight or gently curved, linear in outline, ultimately 
disarticulating ; joints linear ; pedicels distinctly narrowed down- 
wards, about 2 lin. long. Sessile spikelet lanceolate-oblong, long- 
acuminate, 2f-3j lin. long, excluding the obtriangular, often narrow, 
acute and distinctly marked callus which is J-1J lin. long, quite 
glabrous. Lower glume coriaceous, opaque, usually very gradually 
acuminate, entire or minutely 2-toothed, acute, margins slightly 
thickened, inflexed flaps almost 0, keels slightly rough, not winged, 
intracarinal nerves faintly raised, about 7, invisible in transmitted 
light ; upper slightly shorter, detachable from the joint, subulate- 
acuminate, membranous except at the hardened tip. Valve of lower 
floret oblong, subobtuse, 2J lin. long, very faintly 2-nerved, of 
upper floret slightly shorter, nerveless. Anthers up to § lin. long. 
Stigmas not quite 1 lin. long. Pedicelled spikelet very similar to 
the sessile, but up to 4 lin. long, with a short obscure transverse 
