16 HutTCHINSON—THE MADDENI SERIES OF RHODODENDRON. 
appeared to be artificial, but of which the natives could 
give no explanation. Wild apple and birch are common 
trees, but there is little jungle, except in the hollows, and on 
the north slopes of the higher hills. Coarse long grass, with 
bushes of Labiate and Composite plants, are the prevalent 
features. 
“ Kollong rock is a steep dome of red granite, accessible from 
the north and east, but almost perpendicular to the southward, 
where the slope is 80° for 600 feet. The elevation is 400 feet 
from the mean level of the surrounding ridges, and 700 above 
the bottom of the valleys. The south or steepest side is en- 
cumbered with enormous detached blocks, while the north is 
clothed with a dense forest, containing red tree rhododendrons 
and oaks; on its skirts grew a white bushy rhododendron, 
which we found nowhere else.” 
This white bushy rhododendron must have been R. inaequale, 
though there are no flowers on Hooker’s specimens. The red 
one collected by Hooker was no doubt what is at present regarded 
as R. arboreum, but it too is in fruit. One wonders why, if they 
were in flower, Hooker did not collect flowering material; or 
did he guess the colour of the flowers? Hooker collected only 
these two Rhododendrons on the Kollong Rock, a locality which 
would no doubt repay the attention of some future collector. 
Mr Clarke made the following remark regarding his var. 
inaequalis (F\. Brit. Ind., iii. p. 473) :—“‘ This has been considered 
a distinct species, and may be so, but the flowers are unknown. 
Branches often hirsute-setose ; leaves entirely without the 
setose ciliae common (but sometimes wanting) in R. formosum. 
Capsules (of which there are numerous examples) more un- 
symmetric than in any other Indian Rhododendron.” These 
remarks are very much to the point. In his own herbarium 
there are flowers, though much past their best and rather 
withered, which were collected after the publication of the 
Flora of British India. 
KEY TO THE SPECIES OF THE MADDENI SERIES. 
I. Eumaddenia.—Petiole with a V-shaped groove on the upper side ; 
leaves medium-sized, very densely rufous-lepidote, with the midrib 
or pubescent ; ovary ‘cells 
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10-12 ; calyx usually well pf potion: 
Filaments of the stamens glabrous : 
Scales on the lower surface of the leaves contiguous or Boel! so, 
never more than their own diameter apart .  Migeene: 
Scales on the lower surface of the leaves from 2-3 jsp their own 
aie apart, the lower epidermis glaucous. 2. calophyllum. 
