HUTCHINSON—THE MADDENI SERIES OF RHODODENDRON. 5 
limited and local distribution of several species. This fact is 
confirmed in the case of R. ciliicalyx and its relatives, many of 
which are described for the first time in the present paper. 
In this case a difference in altitude seems to produce a difference 
in species, all of which, however, belong to the same complex. 
R. ciliicalyx itself occurs at an altitude of 7300 ft. near Mo-so-yn, 
whilst R. Scottianum grows at a similar elevation near Tengyueh 
and Chutong. At 8000-9000 ft. on the Shweli-Salween Divide 
we get R. voseatum and R. lasiopodum, whilst on the eastern flank 
of the Tali Range, between 10,000 and 12,000 ft., there is a 
beautiful little species, which from its occurrence at such a high 
altitude I have called R. supranubium. No doubt Mr Forrest 
could enlighten us much more regarding the distribution of 
these species now that they have been segregated from R. 
ciliicalyx, to which they had been provisionally referred. True 
R. ciliicalyx has not appeared in any recent collections. Then 
even Szemao in South and Mengtz in South-Eastern Yunnan 
has each its characteristic species, belonging to the same group, 
in R. rufosquamatum and R. pilicalyx respectively, whilst a near 
relative, R. Lyi,occurs in the neighbouring province of Kweichow. 
Just how constant are the differences which go to distinguish 
these Yunnan species as shown in the key (p. 16), and to 
what extent they will stand the test of cultivation and further 
collection, I am not prepared to say. 
VALUE OF CHARACTERS IN. THE MADDENI SERIES. 
Habit.—Some of the species are epiphytic on old tree stumps ; 
such are R. Nuttallii, R. Lindleyi, and R. Veitchianum, whilst 
R. dendricola grows at the tops of trees 50-60 ft. high; the 
majority, however, are terrestrial shrubs or small trees, ranging 
in height from 1} to 20 ft. 
Bark.—In only a few species is the bark of the stem and 
older branches known to the writer; in R. ciliicalyx it is very 
membranous and purplish-brown, and curls off in large pieces ; 
a similar but thicker bark is found in R. Vettchianum. 
One-year-old Shoots.—All are more or less lepidote, whilst 
in subseries Ciliicalyx they are very frequently bristly hairy 
as well as lepidote, as in R. ciliatum, R. Johnstoneanum, and R. 
Lyi (fig. 7). 
Axillary Leaf-bearing Buds.—The dormancy or degree of 
development of the axillary leaf-bearing buds at the time of 
flowering seems worthy of attention, although the character 
might vary in different individuals of the*same species. In 
R. ciliicalyx and R. Scottianum the leaf-buds are well developed 
at the time of flowering. 
Terminal Leaf-bearing Buds.—In regard to the structure of 
