BALFOUR—NEW SPECIES OF RHODODENDRON. 97 
long 2.2 cm. broad emarginate. Stamens 10 much shorter than 
corolla, unequal longest about 2.6 cm. long, shortest about 1.6° 
cm. long ; filaments white glabrous dilated downwards ; anthers 
dark crimson. Disk glabrous. Gynaeceum shorter than longest 
stamens about 2.3 cm. long ; ovary dome-shaped broad truncate 
deeply grooved about 3 mm. long densely clad with a yellow 
tomentum composed of long fasciate firm hairs ; style stout 
glabrous expanded below the discoid lobulate pale stigma where 
it forms a lip. Capsule straight about 1.5 cm. long 7 mm. in 
diameter densely brown-woolly dehiscing from apex to base by 
5-10 woody valves, style often persisting. 
S.E. Tibet. On Doker-la, Mekong-Salween divide. Lat. 28°25’ 
N. Alt. 12,000-13,000 ft. Open bouldery slopes. Shrub of 3-4 ft. 
Flowers deep crimson. G. Forrest. No. 16,691. July 1918. 
S.E. Tibet. Ka-gwr-pw, Mekong-Salween divide. Lat. 28° 
35’ N. Alt. 12,000 ft. Open situations amongst rocks. Shrub 
of 4-5 ft. In fruit. G. Forrest. No. 14,987. Oct. 1917. 
Western N.W. Yunnan. At Na-ki-lu, Mekong-Salween 
divide. Lat. 27° 50’ N. Alt. 1r1,000-12,000 ft. In open 
thickets and on boulder-strewn slopes. Shrub of 4ft. Flowers ? 
probably deep crimson. G. Forrest. No. 17,329. Oct. 1918. 
Western N.W. Yunnan. On the Si-la Pass, Mekong-Salween 
divide. Lat. 28° 12’ N. Alt. 13,000 ft. Shrub of 2-4 ft. 
Duplicate in fruit. G. Forrest. No. 17,330. Oct. 1918. 
In Rh. chaetomallum we have a member of the Haematodes 
* series from far N.W. Yunnan and S.E. Tibet, representing there 
Rh. haematodes, Franch. which is a plant of the Tali Range 
and Rh. aemulorum, Balf. f. which is a southern representative 
of the series on the Shweli-Salween divide and in N.E. Upper 
Burma. From both of these the setulose indumentum on the stem 
and leaf-petioles give a distinction. In general habit of growth 
Rh. chaetomallum recalls the type—developed so markedly in the 
Tsarong—which is seen in Rh. eudoxum, Balf. f. et Forrest 
and its allies and in Rh. sanguineum, Franch. and its allies. 
But here the indumentum has evolved as a thick somewhat 
loose tomentum over the under surface of leaf in contrast with 
the thin detersile form it assumes in the Rh. eudoxum phylum 
and the agglutinate pellicle-like condition in which it appears 
in the Rh. sanguineum phylum. The linking of all these forms 
will be an interesting task for those who deal with Rhododendrons 
some years hence, when the species in the centre of distribution 
of the genus have been discovered and identified. 
Rh. chaetomallum is one of the species of Rhododendron in 
which mycophyllon appears.* Some of the leaves have quite 
a blackened under surface through the development of fungus. 
* See Notes R.B.G. Edin., xii (1919), 145. 
