FLORA OF ADEN. 
291 
free ; upper pair arising near the base of the corolla-tube, 2 lines long, 
with a stout obtuse hairy reflexed process at the knee ; lower pair in- 
serted just below the base of the lower lip, 1§ lines long. 
Nutlets subglobose, f line iu diameter, slightly mgulose, dark 
brown. 
Locality: — Aden (Birdw.). Not gathered by anv other botanist. 
Doubtfully indigenous. 
Distribution .-—Transvaal, Natal, Tropical Africa, Tropical Asia. 
2. Orthosiplion Bentli. 
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. 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 un- 
equally 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 
dorsal ly. 
Species over 100. 
Distribution : — >S. and Tropical Africa, Madagascar, Socotra, Arabia^ 
India, the Malay Archipelago, Australia. 
1. Ol'tliosiphon pallidllS Hoyle mss.; Benth. in Hook. Bot. Miso, 
III, 370 ; DC. Prodr. XII, 50 ; Boiss. PI. Or. IV, 539 ; Hook. FI, 
Brit. Ind. IV, 613 ; This. -Dyer FI. trop. Afr. Y, 369. 
Orthosiphon verticillatus Heyne in Herb. Rottl. 
Orthosiphon inodorus Koen ; Roxb. Ic. in Herb. Kew. 
Orthosiphon Ehrenbergii Vatke in Linnsea XXXVII, 316. 
Ocimum reflexum Ehrenb. ex Schweinf. Beitr. FI. Aethiop. 126. 
