256 BALFOUR—-RHODODENDRON : 
venis primariis utrinsecus circ. 8-10 paullo elevatis ; subtus ful- 
vida dense discontigue lepidota intervallis viridibus diametrum 
squamarum aequantibus, squamis peziziformibus uniformibus im- 
pressis nitidis rubiginosis umbone lato concavo resinoso-punctu- 
lato institaque angusta membranacea albido-flavida vel roseo- 
tincta, costa media glaberrima, venis primariis occultis ; petiolus 
cire. 1.5 cm. longus sulcatus ut ramuli vestitus. Flores in um- 
bellas 4-floras terminales dispositi; bracteae mox deciduae; 
bracteolae lineares sursum dilatatae circ. 1.2 cm. longae mem- 
branaceae a basi pilosae dorso lepidotae apice pilocristatae ; pedi- 
celli validi circ. 2 cm. longi purpurei sparsim lepidoti sub 
flore expansi. Calyx cupuliformis ad 4 mm. longus; cupula 
glauco-purpurea lepidota circ 1.5 mm. longa; limbus membrana- 
ceus brunneus 5-lobus; lobi inaequales rotundati vel deltoidei 
squamo-fimbriati. Corolla rosea emaculata ad 4 cm. longa ex 
tubo brevi lato subcampanulato in limbum 5-lobum ampliatum 
patentem expansa paullo zygomorpha extus glabra; tubus intus 
pubescens; lobi rotundato-ovales circ. 1.5 cm. longi 2 cm. lati 
undulati. Stamina 10 inaequalia corolla paullo breviora; fila- 
menta basim nudam versus puberula. Discus sub  ovario 
puberulus. Gynaeceum ad 4.5 cm. longum corollam excedens ; 
ovarium conoideum truncatum ad 4 mm. longum dense lepidotum ; 
stylus glaber sub stigmate lobulato expansus. Species Seriei 
Triflori, phyli Rh. oreotrephis. 
Western N.W. Yunnan. Bei-ma-shan. 12,000 ft. Forrest 
No. 13,992. June 1917. 
A general want of hairs on vegetative parts—none on stems or 
leaves—marks this species. Other marks : very smooth elepid- 
ote upper surface of young expanding leaves—under-leaf scales 
not touching on these young leaves; impressed scales on under- 
leaf close set; bracteoles % shorter than pedicels; purple 
pedicels; limb of calyx relatively large; corolla short and wide- 
tubed—tube hairy inside; style very long. Note leaves are 
never cordulate. 
Compare with Rh. trichophorum where you have hairs and a 
nearly or quite cordulate leaf-base and a puberulous midrid 
above. Scales on young leaf are dense and overlap. 
This belongs to the impressed scale group in its phylum with 
midrib below esquamulate. 
ums Rhododendron didymum, Bali. f. et Forrest. | 
Fruticulus. Rami recti annotini purpurei glandularum 
: osarum vestigiis plus minusve praediti. Alabastrorum 
: perulae plus minusve persistentes. Folia parva in pseudo- 
verticellos disposita per annos 3-4 persistentia 4.5 cm. longa 
petiolata ; lamina rigida crasse coriacea obovata ad 4 cm. longa 
