2  HuTCHINSON—THE MADDENI SERIES OF RHODODENDRON. 
or the opportunity of studying these specimens the writer 
tenders his grateful thanks to Professor Balfour, to the Kew 
Directorate for the necessary facilities in carrying out the work, 
and in particular to Dr Stapf, who has been ever ready to help 
with difficult questions. 
The text figures are mainly of those species of which the 
material preserved up to the present is very scanty, often a 
single sheet. They do not claim any artistic merit, nor, having 
been prepared from dried material, can they give, of the flowers 
especially, a correct representation of perspective. But they 
will give some idea of the appearance of the dried plant (only 
one corolla is shown in each), particularly the shape of the 
leaves, the disposition of the leaf-scales and the appearance 
of the calyx, with the degree of scaliness of the style, etc., on 
which I have relied so much in framing the key. 
DISTRIBUTION OF THE MADDENI SERIES. 
The group has a fairly wide area of distribution, ranging 
from Sikkim (R. Dalhousiae, and others) in the west, east to 
Kweichow (R. /iliiflorum), and southward to. Tenasserim, in 
Lower Burma (R. Veitchianum). There are thirty-nine species 
in the series so far as known at present. The following list gives 
their names, distribution, and the name of the discoverer and 
year of collection ; from it may be gathered some idea of the 
great number of species which have come to light during the 
last few years :— 
SPECIES. HABITAT. COLLECTOR AND DatTE. 
‘R. brachysiphon, Balf. f. Bhutan scone og ft.). | R. E. Cooper (1915). 
R. burmanicum, Hutchinson | $.W. Burm a (alt. ?). Lady Wheeler Cuffe 
(1913). 
R. calophyllum, Nutt. . | Bhutan (6000~—7000 ft.). | T, J. Booth (1850 ?) 
R. carneum, Hutchinson. | N.E. Burma (7500 ft.). | Major C. W. Browne 
(1912). 
R. ciliatum, Hook. f. . | Sikkim (gooo-11,000 ft.).| J. D. Hooker (1849). 
| R. ciliicalyx, Franch. . | W. Yunnan (7300 ft.). Delavay (1883-5). 
R. crassum, Franch. . | W. Yunnan (7000-12,000 | Delavay (1889). 
ft.) and eae Burma 
(8000 ft.). 
\*R. Cubittii, Hutchinson _.. | N. hecreia ts BS £%.): G. E. S. Cubitt (1909). 
R. Cuffeanum, Craib . . | S.W. Burma (alt. ?). Lady Wheeler Cuffe 
: (1913). 
| R. Dalhousiae, Hoo! . | Sikkim Devas Ge ft.). | J. D. Hooker (1848). 
i*R. dendricoa, Hutchinson : . | N.E. Burma (alt. Kingdon Ward (1914). 
Hemsl S.E. Yunnan (alt. *. A. Henry (1896-8). 
| R. fermen, Wal. . | Khasia Hills, Assam | R. Smith (1832). 
: : (4000-5500 ft.). 
*R. inaequale, Hutchinson .| Khasia Hills, Assam | Griffith (1835). 
(4 .). 
|*R. iteaphyllum, Hutchinson | Khasia Hills, Assam | J. D. Hooker (1850). 
(2000 ft.). 
* Described for the first time in the present paper. 
