BALFouR—NEw SPECIES OF RHODODENDRON. 273 
Species aspectu Rh. Falconeri, Hook. f. sed foliis supra multo 
minus rugulosis pedicellis ovarioque eglandulosis divergens. 
Yunnan. Mengtz. N. Mountains. Summit of forests. 
gooo ft. Tree 20 ft. Flowers pale yellow. Henry. No. 9448. 
Hemsley in the Kew Bulletin (1910), 107 refers this plant to 
Rh. Falconeri, Hook. f. against the opinion of Wilson. Wilson 
was right. The plant is strikingly different from Rh. Falconeri. 
Hooker (Rhod. Sikkim Himal. (1849), 11) precisely describes the 
pedicels and ovaries of Rh. Falconeri as viscid. The viscidity 
is produced by the conspicuous clavate reddish glands which 
cover the organs amidst the fewer hairs. The ovaries are so 
viscid that they glue together the surfaces of the corolla in 
dried specimens. There is not a trace of these viscid glands in 
Rh. sino-Falconert, Balf. f., and the character is an easily 
observed diagnostic mark. 
A specimen collected by Hancock under No. 439 on the . 
Great Black Mountain Range at gooo ft. is also assigned to Rh. 
Falconert. I have not seen the specimen, but on general grounds 
of distribution I doubt the identification. So far I know of 
the occurrence of no one of these large-leaved Himalayan species 
in Western China. Chinese plants referred to Rh. grande, 
Wight are not that species. 
Apart from this differentiating character of the presence or 
absence of glands there are many others by which the species 
can be distinguished at a glance. I will not lay stress upon the 
form of the base of the leaf which in Rh. sino-Falconeri is never 
cordulate whilst that is its shape usually in Rh. Falconeri, but 
the differences in the upper and under surfaces of the leaf in 
the two plants are thoroughly distinctive. Rh. Falconeri is 
a familiar plant in cultivation, and to most observers, I think, 
the rugosity of its leaves both above and below, and the dark 
cinnamon indumentum filling up the excavations on the under 
side appear as ready marks of recognition. You do not find 
these features so prominent in Rh. sino-Falconeri. There 
may be a slight rugosity on the upper surface, but the 
under surface is smooth and velvety with a buff-coloured in- 
dumentum. There are no excavations, and the primary veins 
do not stand out like cords as they do in Rh. Falconeri. And 
along with this we find the under-leaf indumentum in the two 
species whilst cast in the same general mould is differentiating. 
In neither species are there epidermal papillae. The epidermis 
is quite smooth and the leaf-surface is level throughout—there 
are no pits. The hairs of the tomentum in Rh. Falconeri 
have stout pluricellular stalks which expand at the top as 
a funnel-shaped membrane one layer thick of many quadrate 
or rounded thick-walled cells. At the bottom of the funnel 
