Ocimum. | LABIAT (Brown). 237 
pedicels 1 lin. long, minutely puberulous ; calyx 1} (in fruit 25) lin. 
long, campanulate, gland-dotted, puberulous, especially towards the 
base, becoming glabrous on the other parts ; upper tooth rounded, 
ciliate ; lateral teeth 1 lin. long, lanceolate ; lower teeth 14 lin. long, 
setaceous, all ciliate ; corolla exserted 1} lin. beyond the mouth of 
the calyx ; puberulous on the outside of the lips; tube included in 
the calyx ; upper lip 1 lin. long, rounded-ovate ; lower lip 1} lin. 
long, spreading ; stamens 14-2 lin. longer than the corolla ; fila- 
ments of the upper pair toothed at the base. 
WESTERN REGION : Great Namaqualand, without precise locality, Dinter, 1549. 
This may possibly have been collected north of the Tropic. 
III. ORTHOSIPHON, Benth. 
(Hemizyera, Brig. in Engl. & Prantl, Pilanzenfam. iv. 3a, 368.) 
Calyx campanulate or tubular-campanulate, unequally 5-toothed ; 
upper tooth much larger than the others, suborbicular, very broadly 
ovate or oblong, sometimes decurrent upon the tube. Corolla 
distinctly 2-lipped ; tube usually exserted much beyond the calyx- 
teeth, rarely about equalling them, straight or nearly so; upper lip 
often partly formed by the truncate mouth of the tube, very 
shortly 3-4-lobed ; lower lip very concave or boat-shaped. Stamens 4, 
exserted, directed towards the lower lip; upper pair with free 
filaments, not toothed and very rarely bent like a knee near the 
base, inserted at various heights in the corolla-tube ; lower pair with 
their filaments free to the base or variably united, inserted at or 
just below the base of the lower lip ; anthers 1-celled. Disk usually 
unequally lobed. Ovary deeply 4-lobed ; style filiform, exserted from 
the corolla-tube ; stigma slightly thickened and minutely bifid or 
subentire or divided into 2 short filiform or subulate lobes. Nutlets 
oblong, ellipsoid or suborbicular, usually slightly compressed dorsally. 
Herbs, perennial or annual, with erect simple or branching stems; leaves 
opposite or rarely whorled, gland-dotted ; inflorescence terminal, simple or 
branched, sometimes with 2 or more pairs of flowerless coloured bracts at the 
apex ; flower-whorls separate, 2-6-flowered ; flowers variable in size. 
Distrre. Species over 100, extending into Tropical Africa, Madagascar, Socotra, 
Arabia, India, the Malay Archipelago and Australia. 
The genus Hemizygia was established by Briquet for the reception of those 
species of Orthosiphon having the filaments of the lower pair of stamens united. 
But I find that the amount of union of these filaments varies considerably in some 
species and in O. subvelutinus and O. montanus, although more usually united, 
they are sometimes quite free ; whilst 0. persimilis, in which the filaments are 
usually but not always free, is so like 0. Thorneroftii in which they are united (see 
note under O. persimilis) and grows with it at the same locality, that I cannot 
consider these species and others similarly related should be placed in different 
genera, as there is no other character than that of the union of the lower filaments 
to separate generically Hemizygia and Orthosiphon. But besides this I have also 
seen specimens in which the filaments were united in some flowers and free in 
