310 BALFOUR—NEW SPECIES OF RHODODENDRON. 
3. Leaves dark green above, bright brown below . pycnocladum. 
Leaves hoary above, yellow-grey below ‘ i : 4. 
4. Leaves oblong or oblong elliptic ‘ ; ; diacritum. 
Leaves narrowly lanceolate . : . ; telmateium, 
5. Style hairy. ‘ : : ; é alpicolum. 
Style glabrous ; ; : . 6. 
6. Style longer thanstamens . ; : nigropunctatum, 
Style shorter than stamens . : ‘ .  thymifolium, 
Rh. telmateium is the only one of these that is in cultivation. 
The plant met with in cultivation under the name Ra. nigro- 
punctatum is not Rh. nigropunctatum, Franch. 
The species of the Lapponicum series in which the scales of 
the under-leaf indumentum are contiguous without sporadic 
punctulation, or stand so close together as to leave only narrow 
chinks uniformly or here and there through which the epidermal 
surface can be seen, are the majority. One may, however, to 
assist recognition, segregate them in smaller sub-series. 
SuB-SERIES C., 
Scales of under-leaf indumentum grey or yellowish-grey, 
contiguous, uniform, forming a shining surface. 
This first sub-series I mention is one in which the under-leaf 
indumentum is composed of truly contiguous, even imbricate, 
scales which are shining, of a grey or perhaps slightly yellowish 
tint. Thisgives the whole surface a uniform coloration in marked 
contrast with the green upper surface. The species that come 
into this category are :-— 
Rh. blepharocalyx, Franch. 
Rh. hippophacoides, Balf. f. et W. W. Sm. 
Rh. idoneum, Balf. f. et W. W. Sm. 
Rh. intricatum, Balf. £. et W. W. Sm. 
Rh. polifolium, Franch. 
Rh. Websterianum, Rehd. et Wils. 
Of these Rh. hippophaeoides, Rh. idoneum, Rh. polifolium, and 
Rh. Websterianum are true members of the Lapponicum series. 
The first and last very much like in general facies—twiggy hoary 
shrubs of some size, the former often with long virgate shoots— 
Rh. idoneum a smaller cushion shrub, Rh. poltfolium an erect 
twiggy shrub with thin branches resembling much Rh. thymi- 
folium, Maxim., but that species has punctulate indumentum. 
Here I interpolate :—When Franchet says of Rh. polifolium 
“ Rh. thymifolio, Maxim. affine: ab illo differt gemmis nec 
unifloris nec ad apicem solitariis, sed constanter 2 vel 3 glomeratis 
et saepe bifloris,”” he does not mean, as the type specimens show, 
