BALFOUR—NEW SPECIES OF RHODODENDRON. 281 
stratum inferius projectis) obtecta costa media supra subsulcata 
subtus paullo elevata venis primariis utrinque occultis ; petiolus 
circ. 1.5 mm. longus indumento sicut folii pagina inferior vestitus. 
Flores solitarii ad apicem ramulorum terminales; alabastra 
ovoidea ; bracteae externae ovatae interiores late rotundatae 
extus lepidotae margine leviter ciliatae ; pedicelli breves circ. 
2.5 mm. longi albido-lepidoti. Calyx circ. 2.5 mm. longus fere 
ad basim in lobos 5 subaequales oblongos obtusos pallide 
virides nunc erubescentes extus dense lepidotos margine eciliatos 
fissus. Corollae roseo-purpureae circ. 1.3 cm. longae tubus in- 
fundibuliformis brevis circ. 3.5 mm. longus extus lepidotus 
intus puberulus haud villosus sursum in limbum apertum 
expansus disco circ. 1.5 mm. lato lobisque oblongis obtusis 
circ. 8 mm. longis undulatis. Stamina 5-10 corolla breviora 
filamentis pallide roseis supra basim paullo pubescentibus. 
Ovarium subcylindricum pallide viride albido-lepidotum ; stylus 
glaber roseus corollam staminaque superans ; stigma purpureum 
lobulatum. 
Species fastigiata Rh. diacrito, Balf. f. et Ward affinis, foliis 
lanceolatis apice angustatis mucronulatis differt. 
amu unnan. Mountains west of Fengkow Valley. Lat) 
° 40’ N. Alt. 10,000-11,000 ft. Open rocky situations in 
aie forest. Shrub of 2 ft. Flowers rose-purple. Forrest. 
No. 12,478. June 1914. 
Yunnan. Mountains of the Chungtien plateau. Lat. 27° 30’ 
N. Alt. 12,000 ft. Open boggy situations on the margins of 
forests. Shrub of 3 ft. Flowers indigo-purple. Forrest. No. 
12,568. June ror. . 
One of the Lapponicum series of Rhododendrons. The two 
sets of specimens collected by Forrest and referred to this species 
differ markedly in the colour of the corolla, and in No. 12,568 
the calyx shows a tendency to reddening, sometimes becoming 
quite purple—a feature not observable in No. 12,478. But I find 
no other separating character. The species is near Rh. diacritum, 
' Balf. f. et Ward, but the leaf form is here quite diagnostic. It 
must also be compared with Rh. drumonium, Balf. f. et Ward, 
and with Rh. pycnocladum, Balf. f. et W. W. Sm. All of them 
are of the Lapponicum series, and of the set in it which are marked 
by the punctulate character of the under-leaf indumentum and 
also by the lepidote corolla. Rh. pycnocladum has quite a 
different habit from the other three, which are erect shrublets 
with very many thin twigs bearing small leaves yellowish-grey 
beneath. The narrow leaves of Rh. diacritum separate it from 
our species. Rh. drumonium has a short style. 
See also p. 300. 
