54 BALFOUR—NEW SPECIES OF RHODODENDRON. 
shape the leaf of the rogue is nearer to Rh. callimorphum than 
to Rh. neriiflorum, but is more pointed than in either, and it 
wants the glaucous under-leaf surface of both: that surface is 
green in the rogue. Rh. neriiflorum is particularly glaucous— 
the epidermal papillae upon which the wax—giving glaucousness 
—lies are long rod-like and somewhat spreading, not close-set ; in 
Rh. callimorphum the papillae are much shorter, of an elongated 
dome-shape, and more close-set. But although the rogue has 
leaves not glaucous below, it has epidermal papillae which are 
not those of either of the species, but are likest to those of Rh. 
callimorphum ; it apparently does not secrete wax to the extent 
observable in the two species. Surveying all the characters of 
the rogue so far as they are known to me, and comparing them 
with those of the two species suggested for its parentage as a 
natural hybrid, the evidence seems to point in the direction 
of correctness of the view that hybridisation has occurred. 
Technical characters possessed by the rogue but not found in 
the suggested parents are :—the more pointed leaf, the green 
under-leaf surface, the spotting of the corolla, and the glabrous 
style. These seem to be all. Through Rh. dimitrwm we know 
now of the occurrence of the first three of these characters in 
the phylum of Rh. neriiflorum, and it may be, if hybridisation 
has taken place, that Rh. dimitrum and not Rh. neriifiorwm 
has been the species with which RA. callimorphum has crossed. 
At the same time the stamens of the rogue are the glabrous 
ones of Rh. neriiflorum, not the puberulous ones of Rh. dimitrum. 
The facts of distribution as we know them would not negate 
the possibility of hybridisation. For Rh. callimorphum from 
the Shweli-Salween divide and Rh. dimitrum from the western 
flank of the Tali Range are as yet only known to us in 
single collectings, and their habitats are sufficiently within 
hail to justify the looking to future exploration for the 
discovery of one or both of them in the intermediate area. 
This rogue, to which I have given the name Rh. dimidiatum, ' 
in allusion to its split calyx, is a most interesting plant 
whether species or hybrid, and further study of it in cultiva- 
tion is desirable. 
Not many days after my receipt of this Rh. dimidiatum 
from Mr. Williams there came to me from Mr. Magor a truss of 
a Rhododendron with a flower for all the world like a “ hose-in- 
hose” Rh. neriiflorum. It too was a rogue, but amongst Rh. 
habrotrichum, Balf. f. et W. W. Sm., not amongst Rh. calli- 
morphum, as was the Caerhays plant. At first looking I thought 
we had to deal with the same form in both plants. Mr. Willams, 
to whom Mr. Magor sent specimens of his plant, doubted their 
being the same, and subsequent analysis confirms this opinion. 
