BALFOUR—NEW SPECIES OF RHODODENDRON, 315 
“humilis.” Rehder and Wilson’s is an interesting plant with 
foliage that would well suit the grouping I make, which must be 
taken however as having no special reference to Rehder and 
Wilson’s plant. Rh. nivale has 10 stamens ; 8 only are described 
in the other species, though I found ro in a flower of Rehder and 
Wilson’s plant. The style is particularly long in Rh. nivale, 
exceeding the stamens, as also in Rh. Edgarianum, but is 
shorter in Rh. ramosissimum. The capsule, as might be 
expected in the very high alpine Rh. nivale, seems to be much 
larger than in Rh. Edgarianum. 
KEY TO THE SPECIES. 
Erect shrub with thick intricate branches. 
funnel-shaped, throat pubescent. Sta- 
mens 8-ro. Style longer than stamens . : Edgarianum, 
Prostrate carpet shrub with thick intricate 
branches. Under-leaf surface brown, 
punctulate. Corolla red purple, throat 
villous. Stamens 1o. Style longer than 
amens . ‘ 
; F ‘ nivale, 
Humble shrub with intricate branches. 
Under-leaf surface fulvously lepidote 
not punctulate orolla cup-shaped, 
rose, throat glabrous. Stamens 8. 
Style shorter than stamens . ; .  ramosissimum, 
Rh. nivale only is in cultivation to my knowledge. Plants 
under the name Rh. Edgavianum are in gardens, but I have not 
found any plants so-called correspond to Rehder and Wilson’s 
description. 
CEPHALANTHUM SERIES. 
The type of Rhododendron exhibited by Rh. cephalanthum, 
Franch. has been known to us otherwise only in Rh. Sargen- 
tianum, Rehder et Wilson from West Szechwan. Now, owing 
to the exploration of Forrest and of Kingdon Ward, we discover 
that the type has a remarkable development in West Yunnan 
and the bordering region of East Burma and Tibet. A dozen 
species have to be added. Taking for the group the name Cepha- 
lanthum from the oldest described species, the species com- 
posing it with their distribution is given in the following table :— 
Rh. acraium, Balf. f. et W. W. Yunnan: Chungtien plateau, 
Sm. 12,000—13,000 ft. 
Rh. cephalanthoides, Balf. f. Yunnan: Lichiang, 12,000-— 
et W. W. Sm. 13,000 ft. 
