128 BALFOUR—NEW SPECIES OF RHODODENDRON. 
broad 5-lobed limb; disk of the limb concave narrow slightly 
puberulous ; lobes subequal oval rounded at apex hardly crenu- 
late about 8 mm. long 6 mm. broad. Stamens Io alternately 
long and short, longer about 1.7 cm. long exceeding corolla with 
red-purple anther 2 mm. long, shorter about 1.4 cm. long 
with anther 1.5 mm. long; filaments slightly widened down- 
wards, base over about 1.5 mm. naked, above that and within 
the tube of the corolla densely lanately and intricately villous. 
Disk puberulous on ridges. Gynaeceum about 2 cm. long 
longer than corolla and stamens; ovary ovoid about 2 mm. 
long grooved puberulous with short ascending hairs and with 
a white hair-crest at top, in upper half more or less lepidote 
with ramentaceous white loose peltate scales ; style red-purple 
pilose in lower third but only slightly expanded under the 
lobulate dark-purple lipped stigma. 
N.W. Yunnan. Kari Pass. Alt. 12,000 ft. Lat. 28° N. 
Open moist stony pasture. Shrub of 2-4 ft. Flowers deep 
purple-blue, throat white. G. Forrest. No. 13,915. June 
1917. 
Rh. russatum is a particularly bright species from the balls 
of deep purple-blue flowers with white throat formed freely at 
the ends of the branchlets and from the intense russet-colour of 
the under-leaf indumentum. It is a most distinct member of 
the series of Lapponicum, and its place in the series is easily 
assigned. It belongs to the sub-series in which the under-leaf 
indumentum consists of contiguous or nearly so bicolorous 
scales—dark and light usually equally intermixed. From all 
the purple-flowered species of the Lapponicum series excepting 
Rh. dasypetalum, Balf. {. et Forrest (see p. 48) it differs in the 
character of the hairy outside to the corolla. Other diagnostic 
marks separating it from members of its sub-series are: elepi- 
dote corolla, leaves more or less oblong narrowed to base, style 
hairy longer than the 10 stamens. Its nearest ally seems to be 
Rh. capitatum, Maxim. from Kansu with very much narrower 
shorter leaves. : 
__ A word about the resemblance to Rh. dasypetalum the other 
known purple-flowered member of the Lapponicum series with 
corolla hairy outside. The plants are really very different and 
there should never be any risk of their being confused but as 
they have in common this pubescent outer surface to the corolla 
one may for the moment—as the plants are likely to be in culti- 
vation from Forrest’s seeds—put one’s self in the position of 
one who had before him a plant with this corolla-feature and 
wished to know which of the two it was. The following tabu- 
lated statement will supply distinctive marks :— 
