84 BALFOUR—NEW SPECIES OF RHODODENDRON. 
et W. W. Sm., and it has all the grace of that species and its 
delicacy of leaf-form and tint of colour. But Rh. leptopeplum 
is easily distinguished by the covering of indumentum on the 
leaf under-surface which is not at all glossy, the glandular 
pedicel, the relatively large glandular calyx, the glandular and 
puberulous ovary. its persistent indumentum on the 
under-leaf surface it resembles most Rh. agastum, Balf. f. et 
W. W. Sm., which is a coarser species with broader and obtuse 
leaves, corolla puberulous inside and glandular style. 
SO Rhododendron leptothrium,* Balf. f. et Forrest. 
Shrub 2-6 m. high with thin twigs and leaves, bearing lateral 
clustered flowers and a terminal foliage-bud. Branchlets a year 
old about I mm. in diameter grey puberulous the pubescence 
persistent on older twigs. Scale-leaves of the foliage-bud per- 
sistent for a time on elongating shoots. Leaves petiolate as much 
as 8 cm. long clustered at end of twigs persistent for several 
years; lamina thin papery lanceolate as much as 7 cm. long 
2 cm. broad, attenuated to the emarginate blunt or somewhat 
truncate apex which has a prominent hydathodal apiculus 
about 1 mm. long arising in the sinus and falling off in older 
leaves, margin very thinly cartilaginous slightly roughened by 
traces of fallen setulose gland-cilia the cilia sometimes persistent 
near the base, base obtuse; surfaces opaque smooth, the upper 
dark green, lower slightly paler, midrib raised on both sides 
imes in a groove on the upper puberulous both above 
and below with short curved hook-hairs, primary veins about 
10 on each side slightly raised, rest of the surfaces somewhat 
minutely papillate, upper surface obscurely punctulate by the 
* JentdOotoc, with thin fine leaves. 
+ Rhododendron leptothrium, Balf. f. et Forrest.—Frutex ad 6 m. altus. 
tenues annotini circ. 1 mm. diam. puberuli, pube persistente. Folia petiolata 
ad 7 cm. longa 2 cm. lata sursum angustata apice truncata emarginata € sinu 
vari . 2 mm. longum petasi- 
forme glandulis viscidum ; stylus glaber. Capsula globosa vel globoso-ovoidea 
calyce inclusa ab apice valvis 5 ad medium dehiscens. Semina circ. 1 mm. 
longa subfusiformia exarillata. 
