Orthosiphon. | LABIAT (Brown). 261 
Imperfectly known species. 
30. 0. ambiguus (Bolus in Journ. Linn. Soe. xviii. 394) ; stems 
ascending, scarcely 1 ft. high, slender, simple or three-branched at 
the base, pubescent ; leaves with petioles about 1 in. long; blades 
1-1} in. long, % in. broad, ovate, subobtuse, coarsely toothed, base 
cuneate, thinly pubescent above, with jointed hairs on the petiole 
and veins beneath ; whorls 4—6-flowered, crowded in racemes scarcely 
1 in. long ; lower bracts leaf-like, subsessile, upper minute, entire ; 
pedicels 2 lin. long; calyx 24 lin. long; tube short, pubescent, 
glabrous within; teeth coloured, upper one scarcely decurrent, 
ovate, obtusely pointed; lower. 4 subequal, lanceolate-subulate ; 
corolla pale blue ; tube } in. long, slender, slightly incurved, thinly 
pubescent ; upper lip obreniform, with a triangular lobe on each side 
at the base; lower lip boat-shaped; stamens exserted ; stigma 
bifid, with subequal subulate lobes. 
Coast Recion: Albany Div.; in woods on a mountain near Grahamstown, 
2000 ft., MacOwan, 987. 
IV. SYNCOLOSTEMON, E. Meyer. 
Calyz subequally 5-toothed, with the dorsal tooth scarcely 
broader than the others, not decurrent on the tube. Corolla exserted 
from the calyx, 2-lipped; upper lip unequally 3-lobed ; lower lip 
concave or boat-shaped, entire, often reflexed. Stamens 4, all 
perfect ; upper pair with free filaments, neither bent nor toothed 
near the base ; lower pair with the filaments united. Disk unequally 
lobed. Ovary 4-lobed; style filiform; stigma minutely _ bifid. 
Nutlets erect, oblong, obtuse, glabrous. 
Herbs or in one species shrubby; leaves opposite, simple, gland-dotted ; 
inflorescence terminal, paniculate, lax or crowded into a dense mass ; flowers in 
pairs or 6-flowered whorls. 
Disrrip. Species 7, all endemic. 
oo genus only differs from Orthosiphon in its subequally toothed calyx. 
«&. Br, 
Corolla-tube 3-5 lin. long; lower or united pair of 
stamens 2-6 lin. long ; whorls 2-flowered, distant : 
Leaves 4-12 in. long, narrowly lanceolate, 4-8 times 
as long as broad : 
Leaves with thin minute adpressed pubescence ... (1) lanceolatus. 
Leaves silvery-white with dense silky adpressed 
pubescence oe ies =e ay it 
Leaves }-§ in. long, lanceolate to elliptic, varying 
from as long as broad to 3 times as long as broad : 
Pubescence on leaves of simple hairs... wis ... (3) parviflorus. 
Pubescence on leaves of very minute stellate hairs... (4) concinnus. 
Corolla-tube 7-10 lin. long; lower or united pair of 
stamens 4-9 lin. long ; whorls 2-6-flowered, crowded : 
Calyx-tube 24-34 lin. long; lower lip of corolla 13-34 
lin. long : : 
’ Panicle narrow, its short branches 4-1 in. apart; 
corolla-tube 7-74 lin. long ... Fe ee aan CRY Pamelor, 
(2) argenteus, 
