80 BALFOUR—NEW SPECIES OF RHODODENDRON, 
dendron forest. Shrub of 1-1} ft. Flowers crimson scarlet. 
G. Forrest. No. 14,012. June 1917. 
S.E. Tibet. On Ka-gwr-pw. Mekong-Salween divide. Lat. 
28° 30’ N. Alt. 14,000 ft. Open rocky pasture. Shrub of 
15-20 ins. Flowers deep crimson, almost black in bud. G. 
Forrest. No. 14,533. Aug. 1917? 
Rh. sanguineum and Rh. haemaleum are allied plants of a 
phylum which appears to be widespread in N.W, Yunnan, and 
it shows, as we find so frequently in the West Chinese flora, several 
microforms bearing distinctive characters which compel us in 
the present state of our knowledge to use specific designations 
for the plants exhibiting them. In this paper appear the 
additional names Rh. citriniflorum, Balf. f. et Forrest, Rh, 
cloiophorum, Balf. f. et Forrest, Rh. eudoxum, Balf. f. et Forrest, 
Rh, leucopetalum, Balf. {. et Forrest, and Rh. roseotinctum, Balt. 
f. et Forrest, all of them of plants nearly allied to Rh. sanguineum 
—of its phylum—but yet differing from it. The whole of them 
are dwarf plants having relatively small thick foliage-leaves 
more or less rugulose above and with white indumentum below 
(excepting Rh, eudoxum); the stems frequently clad with per- 
sistent scale-leaves of the bud and often setulose ; the flowers in 
usually few-flowered terminal umbels; the calyx with coloured 
lobes drying and often deciduous ; the corolla some form of 
campanulate, fleshy and brilliantly coloured a tint of red or 
orange, often with interpetaline imperfect septa; the stamens. 
shorter than corolla and gynaeceum with glabrous or puberu- 
lous filaments; the ovary tomentose and sometimes also 
glandular ; the style a little shorter than corolla. The following 
key gives some of the diagnostic marks between them :— 
Under-leaf surface “clase aii with scattered floc- 
cose 
Scale-leaves of the the foliage-buds falling at expansion. 
Pedicels and ovaries glandular. 
Filaments of stamens puberulous. 
Calyx-lobes membranous red glabrous 
i gland- and flock-fringed. Corolla 
tubular-campanulate dar dark rose eudoxum. 
Under-leaf tele white, grey, or buff-coloured, com- 
etely covered by indum ntum. 
Scale leven of thefoliag g 
Pedicels and ovaries ies eglan orks :. 
Filaments of stamens glabrous. 
Calyx- one fleshy dark-crimson floccose- 
we Corolla campanulate dark 
a 
sanguineum. 
Calyx lobes membranous yellow ‘deciduous, 
on back and _ floccose-ciliate. 
Corolla openly ronnie or white . .  leucopetalum.. 
