98 BALFOUR—NEW SPECIES OF RHODODENDRON. 
take the name Thomsoni, after the well-known Himalayan Rh. 
Thomsoni. At present I take the Thomsoni series as a separate 
one distributed in the Himalaya and Western China, and dis- 
tinguished by the tubular campanulate corolla and the usually — 
glabrous ovary and glabrous style, whilst in foliage and other 
characters its species closely resemble some of those of the 
Campylocarpum series and approach the Selense series. The 
Thomsoni series I speak of includes :— 
Rh. candelabrum, Hook. f. Sikkim, 10,000-11,000 ft. 
(1849). (Hooker f.) 
Rh. cyanocarpum, Franch. Mid. W. Yunnan: Tali, 
(1895). 10-12,000 ft. (Delavay.) 
Rh. eriphyllum, Balf. f. et | Mid. W. Yunnan, 11,000 ft. 
W. Sm. (1917). (Forrest.) 
Rh. Hookeri, Nutt. (1853). Bhutan, 8000-goo00 ft. 
(Booth.) 
Rh. rotundifolium, David W. Szechwan: Muping, 
(1872). 12,500 ft. (David.) 
Rh. Thomsoni, Hook. f. (1849). Sikkim, 
II,000-13,000 ft. 
_ (Hooker f.) 
In support of the suggestion that all the species here named 
belong to one phylum and that their separation in the three 
series of Campylocarpum, Selense, Thomsoni is more artificial 
than natural, I would point out that the gland coating of the 
gynaeceum—the chief technical diagnostic mark of the series— 
shows some variation. Rh. callimorphum and Rh. dasycladum 
of the Campylocarpum series have the glands confined to the 
base of the style and not covering the whole—a step as it were 
towards the glabrous style of the Selense series. And then 
Rh. candelabrum and Rh. eriphyllum are microforms respectively 
of Rh. Thomsoni and Rh. cyanocarpum and in them the ovary 
has some glands and shows thus a step towards the completely 
glandular ovary in the Selense and Campylocarpum series. It 
is of special interest to note that this variation occurs in both 
the Himalayan and the Yunnan representative species. 
“> Rhododendron dasycladum, Balf. f. et W. W. Sm. 
Frutex ad 3 m, altus tenuiter ramosus ramis strictis, Ramuli 
hornotini circ. 2 mm. diam. nigricantes indumento hetero- 
morpho fulvido viscido vestiti, indumento e setulis sebaceis glan- 
dulis rubidis clavatis vel capitatis terminatis et e pilis breviter 
stipitatis similiter glandulosis etiam e pilis floccosis sebaceis 
eglandulosis vix stipitatis multo radiatimque ramosis vel longius 
