88 BALFOUR—NEW SPECIES OF RHODODENDRON. 
somewhat fleshy slightly 5-gibbous at base with imperfect 
interpetaline septa inside; lobes rounded about 1.4 cm. long 
1.8 cm. broad. Stamens Io unequal, longest about half the 
length of the corolla, shortest about 4 mm. shorter than long 
ones; filaments glabrous. Disk glabrous. Gynaeceum about 
3 cm. long shorter than corolla ; ovary ovoid truncate grooved 
about 6 mm. long densely tomentose with slightly pink-tinted 
fasciate floccose hairs, eglandular; style glabrous expanded 
at top below the broad-lipped lobulate stigma. 
W.N.-W.-Yunnan. Mekong-Salween divide. Lat. 28° 12’ N. 
Alt. 12,000-13,000 ft. Open rocky slopes and ledges of cliffs. 
Shrub of 2-33 ft. Flowers pure white. G. Forrest. No. 14,270. 
July 1917. 
One of the allies of Rh. sanguineum, Franch., distinguished 
by its pure white corolla. Perhaps its nearest relationship in 
the Sanguineum phylum is with Rh. cloiophorum, Balf. f. et 
Forrest, but that species has persistent scale-leaves over the 
stem, a thicker more developed tomentose upper stratum of the 
under-leaf indumentum, much larger calyx-lobes, which are 
glabrous outside, and the corolla is distinctly tubular-cam- 
panulate. See p. 80, where the relationships in the San- 
guineum series are discussed. 
Rhododendron levistratum,* Balf. f. et Forrest. t 
Shrub as much as 3 m. high with stout branches. Branches 
of the year about 4 i 
levis, smooth—in allusion to the smooth leaf-indumentum. 
+ Rhododendron levistratum, Balf. £. et Fi 
oso plus minusve rufo indutis. Alabastra ovoidea acuta, 
