12 HuUTCHINSON—THE MADDENI SERIES OF RHODODENDRON. 
in May 1848 he says: ‘‘ Above Simonbong, the path up Tonglo 
is little frequented : it is one of the many routes between Nepal 
and Sikkim, which cross the Singalelah spur of Kinchinjunga 
at various elevations between 7000 and 15,000 feet. As usual the 
track runs along ridges, wherever these are to be found, very 
steep, and narrow at the top, through deep humid forests of 
oaks and Magnolias, many laurels, both Tetranthera and Cinna- 
momum, One species of the latter ascending to 8500 feet, and one 
of Tetranthera to gooo feet. Chestnut and walnut here appeared, 
with some leguminous trees, which however did not ascend 
to 6000 feet. Scarlet flowers of Vaccinium serpens, an epiphytic 
species, were strewed about, and the great blossoms of Rhodo- 
dendron Dalhousiae and of a Magnolia (Talauwma Hodgsoni) lay 
together on the ground.” 
In his herbarium there is an envelope containing a single 
leaf and a corolla which are unmistakably R. Dalhousiae ; and 
the envelope is marked ‘“‘ Rhod. Dalhousiae, Tonglo, Sikkim. 
May 1848.” This corolla is no doubt one of those which 
he mentions as lying on the ground with those of the 
Talauma. 
Hooker only refers to Rhododendron Dathousiae on two other 
occasions. In describing his ascent of Choongtam Mountain 
(z0,000 ft.) in May 1849 (Journal, ii. p. 25) he mentions its 
occurrence: ‘“‘ On the apa apave <necustan village I gathered, 
at 5000 to6000 feet, R/ eumand Dalhousiae, which 
do not generally Tow at Darjeeling below 7500 feet. I collected 
here ten kinds of Rhododendron, which, however, are not the 
social plants that they become at greater elevations. Still, in 
the delicacy and beauty of their flowers, four of them, perhaps 
excel any others; they are, R. Aucklandii, whose flowers are 
five inches and a half in diameter; R. Maddeni, R. Dalhousiae, 
and R. Edgeworthii, all white-flowered bushes, of which the two 
first rise to the height of small trees.”’ 
Whether in this case Hooker was speaking of true R. Dal- 
housiae or R. Lindleyi I cannot say, as there seems to be no 
specimen amongst his exsiccatae from Choongtam. However, 
in the Journal, p. 185, we learn that Hooker and his party in 
October “arrived at Choongtam (for the fourth time). . 
I spent a day here in order to collect seeds of the superb rhodo- 
dendrons which I had discovered in May, growing on the hills 
behind.” In a footnote to p. 186 he says: ‘“‘ These Rhodo- 
dendrons are now all flourishing at Kew and elsewhere; they 
are R. Dalhousiae, arboreum, Maddeni, Edgeworthii, Aucklandii 
and virgatum.” 
On Hooker’s journey to the Chola Pass in November 1849 (p. 
197) he says: “‘ A long march up a very steep, narrow ridge took 
