64 BALFOUR—NEW SPECIES OF RHODODENDRON. 
inside; lobes rounded about 1.5 cm. long 1.8 cm. broad emar- 
ginate. Stamens ro unequal shorter than corolla, longest about 
2.5 cm. long with anther 3 mm. long, shortest about 1.5 cm. long 
with anther 2 mm. long; filaments dilated downwards finely 
puberulous at very base. Disk finely puberulous below ovary. 
Gynaeceum nearly equalling in length the corolla much longer 
than stamens; ovary about 4 mm. long cylindric truncate 
grooved densely clad with short setulose ovoid glands mixed 
with a few fasciate floccose hairs; style glabrous stout clavate 
below the broad lobulate stigma to which it forms a narrow lip. 
N.W. Yunnan. Mekong-Salween divide. Lat. 28° 12’ N. 
Alt. r1,000 ft. In open Rhododendron thickets. Shrub of 
6 ft. Flowers deep clear crimson rose with few markings. 
G. Forrest. No. 14,245. July 1917. 
S.E. Tibet. Tsarong. On Ka-gwr-pw, Mekong-Salween divide. 
Lat. 28° 40’ N. Alt. 13,000 ft. In open thickets and Rhodo- 
dendron scrub. Shrub of 3 ft. Flowers deep magenta rose. 
G. Forrest. No. 16,711. July 1918. 
Rh. eudoxum is one of those bright-flowered small shrubs 
like Rh. sanguineum, Franch. and its allies, of which N.W. Yunnan 
has furnished so many. It is a larger plant than most of the 
members of the Sanguineum series, and differs from them 
conspicuously in wanting the white or buff-coloured under- 
leaf surface which is so characteristic of them. The compact 
though thin indumentum which gives the surface-effect is not 
developed in Rh. eudoxum, where the under-leaf surface is pale 
yellowish-green and bears a thin veil of distant dried-up 
rosette-hairs only. Casual observation might suggest that the 
leaf-surface is glabrous, but careful looking will reveal the 
existence of the very slight coating which slightly obscures the 
green epidermal cells beneath. Other characters of RA. eudoxum 
are those of a typical member of the Sanguineum series. Its 
mode of growth is the same—by short annual increments pro- 
ducing rosulate groups of leaves at the end of the shoots, and 
with a tendency to thickening of this area of the annual growth 
so that the branch becomes more or less nodulose. Here the 
scale-leaves of the bud always fall early, and do not coat the 
stems as in some of the Sanguineum series. Then the calyx 
with deciduous membranous lobes, the tubular-campanulate 
corolla with basal imperfect interpetaline septa, the floccose- 
glandular ovary and glabrous style are also characters of the 
Sanguineum series. We must look upon Rh. eudoxum as a 
member of the series aberrant in its leaf-indumentum. 
