49t 
48 BALFOUR—NEW SPECIES OF RHODODENDRON. 
series along with a small number of species—Rh. cheilanthum, 
Balf. f. et Forrest, Rh. cuneatum, W. W. Sm., Rh. nitidulum, 
Rehd. et Wils., Rh. tapetiforme, Balf. f. et Ward—in which the 
scales of the under-leaf indumentum are uniform concolorous 
contiguous forming a fulvous surface. From these species with 
like indumentum it is at once separated by its corolla with hairy 
outer surface. This is an unusual feature amongst Lapponicums. 
We have it in the yellow-flowered Rh. primulinum, Franch., and 
in the purple-flowered Rh. russatum, Balf. f. et Forrest. It is 
more a character of the Cephalanthum series. It is found also 
in Rh. sempervirens, Hort., and conspicuously in Rh. dauricum, 
Linn. 
From the four species I havenamed in the subseries into which 
its indumentum brings it there are abundant other characters 
of distinction in addition to that of the hairs on the outside of 
the corolla :— 
Rh. chetlanthum has larger and broader leaves with a zygo- 
morphous corolla and the style about equal in length to corolla 
and stamens. 
Rh. cuneatum. has leaves many times the size, has larger 
flowers pronouncedly zygomorphous, lepidote corolla and a long 
protruding style. 
Rh. tapetiforme is a dwarf carpet-forming species with a 
darker more rufous indumentum bearing pink flowers in 3- 
flowered compact trusses with shorter pedicels, bracteoles longer 
than the pedicels, calyx shorter barely 1 mm. long with lobes 
somewhat semi-lunate, style glabrous. 
Rh. nitidulum has scintillating amber-coloured scales on upper 
leaf-surface, shorter calyx about 2 mm. long, corolla lepidote 
outside and glabrous style. 
The general habit of the plant and form of leaves recall Rh. 
sclerocladum, Balf. f. et Forrest, but that species has an indu- 
mentum of bicolorous scales and has no hairs on outside of its 
very markedly zygomorphous corolla. 
a horticultural plant Rh. dasypetalum does not make 
claim to much merit. There is no outstanding feature to give it 
preference over many another of the Lapponicum series, indeed 
its dull foliage has in dried specimens a drab appearance that 
is not promising. 
Rhododendron detonsum,* Balf. f. et Forrest. 
Shrub 3-4 m. high with stout branches about 5 mm. in dia- 
meter when a year old, green glistening having scattered large red 
* detonsum, shorn—in allusion to the fallen indumentum. 
+ Rhododendron detonsum, Balf. f. et Forrest—Frutex ad 4 m. altus ramis: 
crassis subnitentibus glandulas rubras et pilos floccosos conspersim gerentibus ;. 
