ALK 
— lepidoti, longe ciliati. Corolla alba tubo flavo deflexa eirc. 1-5 cm. longa; tubus 
150 BALFOUR—NEW SPECIES OF RHODODENDRON. 
obovate though sometimes approaching it. Rh. obovatum has 
solitary flowers or these are in groups of two to three and then 
they have the truly umbellate development typical of the Lepi- 
dotum series. In Rh. thyodocum the axis of the inflorescence is 
elongated and the several flowers up to 8 come off from it after 
the method in a raceme. 
In all the Lepidotum series the vascular supply to the corolla- 
limb comes off from the torus in the form of bundles three to 
each petal (the middle bundle strongest) and these groups of 
three bundles traverse the corolla-tube to its mouth. At this 
point one of two distributions occurs. Whilst the middle bundle 
of the group always runs to the tip of the corolla-lobe to which 
it belongs the pair of lateral ones may do likewise giving off 
lateral veins as they ascend. This is the distribution in Rh. 
elaeagnoides, Hook. f., Rh. leprdotum, Wall., Rh. obovatum, Hook. 
f., and in Rh. salignum, Hook. f.—that is in all the Sikkim species. 
In others whilst the mid-bundle of each group runs to the tip of 
a corolla-lobe the adjacent lateral bundles deliquesce at once 
curving outwards at the base of the lobes and losing them- 
selves in lateral branchings. The corolline lobe then has a 
conspicuous midrib only from which ascending lateral and 
spreading lateral branchlets are derived. This second dis- 
tribution occurs in Rh. Baileyi, Balf. {., Rh. sinolepidotum, 
Balf. f., and in Rh. thyodocum—that is in the Bhutan, E. 
Assam and Chinese species. 
I am not at all sure that Rh. thyodocum is the only distinct 
Bhutan species. Under No. 1805 Cooper collected at Linghsi 
Timpu on 24th July ror4 at an elevation of 13,000 ft. a plant 
in fruit that in some ways resembles Rh. obovatum and differs 
. from Rh. thyodocum. Further, the N.W. Himalayan plants 
Placed in Rh. lepidotum require to be critically compared with 
those from the E, Himalaya. There seem to be differences 
between them, 
Rhododendron tsarongense,* Balf. f. et Forrest.} 
Aromatic shrub some 5 dm. high densely branched. Branchlets 
of the year barely 1 mm. in diameter brownish-grey furfuraceous 
Tsarong is a district in S.E. Tibet. 
* 
+ Rhododendron tsarongense, Balf. f. et Fotrest.—Suffrutex aromaticus ad 
5 dm. altus. Ramuli juveniles Squamis longe pedicellatis demum resinosis dense 
2.5 cm. longa breviter petiolata ; lamina oblonga vel ovali-oblonga ad 2.2 cm. 
longa t cm. lata apice basique obtusa margine recurvata ; supra atro-viridis vesti- 
Tacemosa multiflora ; pedicelli ad 4 mm. longi. Calyx poculiformis membrana- 
basim 5-fissus ; lobi oblongi obtusi extus resinoso- 
has rat tek 
