156 
CLVIl. GRAMINE^ (Stapf). 
[Cleistachne. 
rotundate, as long as the lodicules, ciliolate. Lodicules sparingly 
ciliate. Grain obovate-oblong, very obtuse, If lin. by almost 1 lin., 
dark brown; embryo-mark very obscure. — C. sorghoides, Pilg. in 
Engl. Jahrb. xxxiv. 127, not of Benth. 
Nileland. British East Africa : Mombasa, Hildebrandt, 1956 ! 1 - 0 r 
Mozambique Distr. German East Africa : Usambara, Lutindi, Holst, 3232 ! 
Bombo Valley, 1300 ft., Holst, 3233. 
30. VETIVERIA, Thouars ex Yirey in Journ. de Pharm. Ire ser. 
xiii. 499. It Vi 
Spikelets 2-nate, of each pair subsimilar, differing in sex, one 
sessile, the other pedicelled, on the articulate fragile rhachis of 
copiously w T horled (rarely panicled) peduncled 3- to many- jointed 
racemes, the sessile spikelets falling with the contiguous joint and 
the accompanying pedicelled spikelet or at least the accompanying 
pedicel ; joints and pedicels slender, slightly and gradually thickened 
upwards. Florets 2, lower reduced to an empty valve, upper $ in 
the sessile, $ in the pedicelled spikelets. Sessile spikelet laterally 
slightly compressed, awned or awnless. Glumes equal ; lower more 
or less coriaceous or chartaceous with a broad rounded back and 
subinflexed margins, usually muticous, upper boat-shaped, keeled 
upwards, with broad hyaline ciliate margins, muticous, mucronate 
or aristulate. Valves hyaline, of lower floret 2-nerved, of upper 
minutely 2-dentate, muticous or mucronulate or with a perfect or 
imperfect awn from the sinus. Valvule minute, hyaline, nerveless. 
Lodicules 2, glabrous. Stamens 3. Stigmas laterally exserted ; 
styles subterminal. Grain oblong, top slightly oblique. Pedicelled 
spikelet dorsally compressed ; glumes much thinner than in the sessile 
spikelet, like the valves usually awnless. — Coarse perennial glabrous 
grasses with stout rhizomes. Culms stout, more or less compressed 
below. Lower leaf-sheaths much compressed, flabellate-imbricate ; 
blades firm to hard, conduplicate in bud, then flattening out at least 
upwards, gradually passing into the sheath. Panicles erect, long, 
of many -rayed whorls of slender simple or rarely compound racemes, 
glabrous except for the frequently minutely bearded calli. 
Species about 7, in the tropics of the Old World, 1 introduced into the New 
World. 
Spikelets 2-2 4 lin. long, quite awnless ; callus glabrous, 
very short, obtuse ... ... ... ... ... 1. V. zizanioides. 
Spikelets 2|— 3£ lin. long, more or less awned ; callus 
bearded, beard exceeding the callus. 
Sessile spikelets spinulously muricate more or less 
all over; callus short, almost square; awn a 
bristle, enclosed or more or less exserted ... 2. F. nigritana. 
Sessile spikelets smooth on the back to beyond the 
middle, aculeolate on the sides, spinulously 
scabrid at the tips, callus up to f lin. long, 
acute ; awn perfect with the column exserted 3. V. fulvibarbis. 
