238 LABIATA (Brown). | Orthosiphon. 
others on the same raceme of O. persimilis or in different racemes of the same 
plant in O. montanus, that is with both genera represented in the same 
inflorescence or by the same plant! It appears to me probable that the union or 
non-union of the filaments has some connection with fertilisation or is of a semisexual 
nature, and as in at least three cases they may be either free or united in the same 
specimen or different specimens of the same species, it is evident that it cannot be 
utilised as a generic character. On this ground I have not upheld Hemizyyia, 
which, if retained, should include all the species in the second division of the 
following key, where it has be-n utilised as affurding a distinguishing character for 
most of the species. All measurements of the corolla in the key and descriptions 
are from flowers that have been soaked in boiling water and will not apply to them 
when dried. N. £. Br. 
*Filaments of the lower pair of stamens free to their 
base : 
Leaves miuutely petiolate, 4-3 in. long, mostly linear 
with revolute margins, or, if expanded, with a 
broadly rounded base... oy oe ... (18) subvelutinus, 
Leaves distinctly petiolate or acutely tapering to a 
subsessile base, more than $ in. long including 
the petiole, not linear : 
Leaves thinly or not very densely pubescent with 
simple hairs on both sides : 
Leaves 3 in a whorl, serrate; corolla-tube far 
exceeding the calyx-teeth ... ay ... (29) serratus. 
Leaves opposite : 
Leaves entire: corolla-tube not or scarcely 
exceeding the calyx-teeth ee ... (9) persimilis. 
Leaves more or less distinctly toothed ; 
corolla-tube exceeding the calyx-teeth : 
Petioles 4—9 lin. long; upper lip of corolla 
distinct from and forming an angle 
with the mouth of the tube ... ... (6) labiatus. 
Petioles 1-2 lin. long; upper lip of corolla 
not distinct from the mouth of the 
tube, and except the very small terminal 
lube continuous with it bay ... (26) Bolusii. 
Leaves glabrous on both sides or with a minute 
pubescence on the midrib and veins beneath; 
corolla-tube 4-} in. long: : 
Calyx with evident nerves, especially in fruit... (21) Wilmsii. 
Calyx without evident nerves... < -.. (22) ineoncinnus. 
**Filaments of the lower pair of stamens variably united, 
sometimes at the very base only : 
tLateral and lower calyx-teeth linear-lanceolate and 
acute or narrowly deltoid and gradually tapering 
to a subulate point, flat for all or most of their 
length, not at all bristle-like : 
Leaves ovate or broadly lanceolate 1-2} in. long : 
Panicle 1 ft. or more long, very lax, with some- 
what spreading branches; leaves densely 
white-tomentose on both sides nye ..» (1) macrophyllus. 
Panicle 7-10 in. long, compact, narrow, with 
nearly erect branches : 
Leaves with thinly scattered hairs above, thickly 
pubescent on the veins beneath ; corolla- 
tube 4-8in. long... ee oe -.. (2) latidens. 
