26 BALFOUR—NEW SPECIES OF RHODODENDRON. 
Rh. obovatum, Hook. f. (1849). Sikkim, 12,000 ft. (Hooker). 
Rh. salignum, Hook. f. (1849). Sikkim, 7000 ft. (Hooker) ; Bhutan, 
8000 ft. (Cooper). 
Rh. sinolepidotum, Balf. f. Yunnan (Delavay); E.N.-W.-Yun- 
7). ece 
. (Forrest). 
Rh. thyodocum, Balf. f. et finer 12,000—14,000 ft. (Cooper). 
Cooper (1919). 
All of them, excepting perhaps RA. thyodocum, are in cultivation. 
A critical account of these species must be reserved for another 
occasion. As matter of fact, there are points in the life-history 
of some of them which require further examination in the 
living plants. The following key for identification of the 
species may be useful :— 
1. Leaves small, under long and broad. 
lowers in ances umbels. 
A. Leaves obovate. 
(a) Corolla yellow, iain 30 sag lobes 
unded, 3-nerved - elaeagnotdes. 
2. Leaves medium, Fob er 1.5 cm. long, under I 
cm. broad. aie in 1-3-flowered 
els. 
B. Leaves _oblong or elliptic-oblong, about 
wice as long as broa 
(6) Corolla neaserplen? red-spotted ; lobes 
escl ng 
from base of lobes or near “it sinolepidotum. 
C. Leaves lanceolate, thrice as long as broad. 
(c) Corolla EES ook green-spotted ; 
obes pointed, 3-nerved salignum. 
(dz) Corolla rceuverple: dark-spotted; lobes 
rounded, 3-nerved lepidotum. 
3- Leaves large, over 2 cm. long, over I cm. broad. 
Corolla 
purple, dark-spotted lobes Soeiacedl 
3-nerved : obovatum. 
(f) Flowers in a ra cemose truss up 
8-flowered. Corolla purple, aie: 
spotted ; lobes rounded, lateral veins 
deliquescing from base or near it thyodocum. 
E. Leaves ——— up to 8.5 cm. long, 3 cm. 
road 
(g) Flowers in piste pean (16) racemes. 
Corolla deep -purple, darker- 
spotted ; lobes nies, lateral veins re 
deliquescing from base or nearit . Bailey. 
