BALFOUR—NEW SPECIES OF RHODODENDRON. 251 
robustus ad 5 mm. longus dense lepidotus curvatus. Calyx circ. 
2 mm. longus extus dense rufo-lepidotus fere obsoletus cupula 
margine obscure undulato-lobulata. Corolla lutea campanulata 
circ. 2.3 cm. longa extus lepidota intus basim versus paullo 
puberula lobis 5 cordatis vel late ovatis vel ellipticis circ. 8 mm. 
longis r cm. latis imbricatis emarginatis et subcrenulatis. 
Stamina 10 inaequalia longiora corollam subaequantia filamentis 
deorsum dilatatis supra basim villosulis antheris oblongis 4 mm. 
longis. Ovarium conoideum circ. 4 mm. longum dense luteo- 
lepidotum et pilis paucis conspersum; stylus ultra corollam 
ad 8 mm. exsertus glaber rectus vel paullo curvatus; stigma 
lobulatum. 
Species Rh. pachypodo, Balf. f. et W. W. Sm. affinis foliis 
minoribus ellipticis indumento diverso calyce epiloso inter notas 
alias recedit.. 
Yunnan. Lips: Pass, Mekong-Salween Divide. Alt. 10,000- 
11,000 ft. Lat. 27° 10’ N. Small spreading shrub of 2-3 ft. 
Flowers, bright yellow. Shady situations on the margins of 
pine forests and cane brakes. G. Forrest. No. 951. 
Nov. 1905. 
An interesting yellow-flowered species distinguished by its 
solitary terminal flower. Its nearest ally appears to be Rh. 
pachypodum, Balf. f. et W. W. Sm. Both of the species 
have remarkably thick pedicels and exceptionally long styles. 
Diels* referred this plant to Rh. sulfureum, Franch. It is 
not Franchet’s species. Apart from the yellow flower-colour 
they seem to have little in common. See what I say on 
p. 283 under Rh. theiochroum about gaps in our knowledge of 
Rh. sulfureum. 
The peltate scales of the indumentum in this species belong 
to the type with well-developed umbo and an entire fringe, its 
margin being quite smooth. I may give a warning here. 
Many parts of the plant, particularly the leaf-petiole and the 
stem, appear to be shortly pilose or puberulous—the hairs being 
black and often issuing from the umbo of the scales. This 
pilosity is due to a fungus. On the upper leaf-surface in the 
old leaves—I know nothing of the young leaves—the peltate 
scales persist and appear as little warts. They have short 
stalks and are not inserted in pits. On the under surface the 
scales are of many sizes, some very small, others large, and they 
have conspicuous stalks arising in pits and bringing the disk 
of the scale to the surface whence the broad fringe expands. 
The epidermal papillae are long and rod-like and are often 
curved. The wax-secretion is not enough to give a white colour 
to the leaf surface between the scales. 
* Diels in Notes, R.B.G., Edin., v (1911), 66. 
