Us 
108 BALFOUR—NEW SPECIES OF RHODODENDRON. 
scattered uncoloured hairs, otherwise glabrous, only slightly 
expanded below the flat purple lobulate lipped stigma. 
S.E. Tibet. Tsarong. On Doker-la, Mekong-Salween divide. 
Lat. 28° 20’ N. Alt. 11,000 ft. Open rocky slopes by streams. 
Shrub of 2-4 ft. Flowers pale rose without markings. G. 
S.E. Tibet. Tsarong. On Ka-gwr-pw, Mekong-Salween 
divide. Lat. 28° 30’ N. Alt. 14,000 ft. On bouldery slopes. 
Shrub of 3 ft. Flowers deep rose without markings. G. 
Forrest. No. 14,513. Aug. 1917. 
This plant has affinity with the Roxieanum series. Its 
nearest ally is Rh. comisteum, Balf. f. et Forrest, from which it 
differs amongst other characters by its unspotted corolla ; 
glandular and tomentose not merely tomentose pedicels and 
ovary; style pilose at base not glabrous. It is like Rd. 
comisteum in indumentum which differs from that of Rh. 
Roxieanum and its immediate allies in having the branches of 
the interlocking hairs broad thin-walled vesicular and collapsing 
not cord-like and tendrillar. 
Rhododendron porphyrophyllum,* Balf. f. et Forrest.+ 
A creeping woody undershrub a few centimeters high or reach- 
ing half a meter rooting freely from the stem, the stems at first 
thin often only 2 mm. in diameter densely clad with cinnamon- 
: coloured woolly tomentum which persists for several years, 
showing short annual growths about 1 cm. long producing about 
5 foliage-leaves at the top and densely clad with the persistent 
sharp-pointed outer scale-leaves of the foliage-bud, older stem 
thick hard woody with a grey decorticating soft bark. Outer 
scale-leaves of the foliage-bud lanceolate-acuminate from the 
or %6Qpve0s, purple—in allusion to the colour of the under surface of the 
: obtusa in alam angustam petiolarem prolongata ; supra viridis 
costa media venisque omnibus sulcatis glabrescens sed 
juvenilium vestigiis notata; infra intense rubro urea ci media elevata 
i $ ubique mento tenui bistrato demum detersili 
enis caeteroquin obscuri 
— Pilis strati Superi rufo-tinctis longe stipitatis multi-ramosis, strati inferi 
rosulatis breviter Tamosis ; petiolus crassus lanato-tomentosus ad 1 cm. longus 
Flores solitarii terminales basi bracteis intim: : . He 
brevius; ovarium cylindrico-conoideum ¢; ili iati 
. nie circ. 4.5 mm. longum pilis fasciatis 
crassis dense vestitum eglandulosum ; stylus glaber. 
