512 WILSON EXPEDITION TO CHINA 
lata, supra atroviridia squamulis albidis dense obtecta, subtus albido- 
cinerea, squamulis pallidis congestis obtecta, costa media supra 
leviter impressa subtus leviter elevata, nervis secundariis obscuris; 
petioli dense fuscescenti-lepidoti, 2-3 mm. longi. Flores plerumque 
solitarii, rarius 2 v. 3 e gemme terminali orti; pedicelli circiter 2 mm. 
longi, lepidoti, perulis occultati; calyx magnitudini variabili, mem- 
branaceus, plerumque purpurascens, interdum  flavo-virens, pro- 
funde 5-lobus, lobis plerumque subaequalibus ovatis v. rotundatis 
2-5 mm. longis et 1.5-3 mm. latis apice rotundatis plerumque sparse 
ciliatis in media dorsi lepidotis; corolla infundibuliformis, roseo- 
purpurea, 2.5-3 em. diam., tubo 6-7 mm. longo intus ad faucem 
villoso, lobis late ovatis v. suborbieularibus 10-12 mm. longis et 
circiter 10 mm. latis; stamina 10, subaequalia, corolla paullo breviora, 
filamentis 12.15 mm. longis complanatis in triente inferiore ima basi 
excepta villosis, antheris fulvis; ovarium conicum, 2 mm. longum, 
dense lepidotum squamulis viridi-cinereis; stylus stamina superans, 
1.3-1.5 em. longus, rubescens, glaber v. sparse lepidotus, interdum 
infra medium sparse pilosus, stigmate capitato atropurpureo. Cap- 
sula ovoidea, 4-5 mm. longa, calyce persistente circumdata, dense 
lepidota, 5-valvata; semina ovalia, circiter 1 mm. longa, fere exalata. 
Western Szech'uan: Tachien-lu, moorlands, alt. 3300-4300 m., 
June and October 1908 (No. 1225, type); north of Tachien-lu, Ta 
p’ao-shan, alt. 4100-4900 m., July 7, 1908 (No. 3462). 
Closely related to Rhododendron polifolium Franchet, which differs chiefly in 
its narrower, generally oblong leaves and smaller calyx, which does not exce 
2 mm. in length. From the preceding species of this group it is easily distin- 
— by the uniformly grayish white color of the densely lepidote under side 
of the leaves. 
We take much pleasure in naming this species for Mr. Frank G. Webster of 
Boston, as a slight mark of appreciation of his constant generosity to the Amo 
Arboretum and of his invaluable help in the arrangement of its Chinese 
Group d. 
Flowers like those of the preceding group, but yellow. Leaves somewhat larget 
with scattered scales beneath, more densely lepidote above. 
Rhododendron flavidum Franchet in Jour. de Bot. IX. 395 (1895). 
Hemsley in Bot. Mag. CXXXVI. t. 8326 (1910). — Hemsley 
Wilson in Kew Bull. Misc. Inform. 1910, 117. — Schneider, Ill 
Handb. Laubholzk. YI. 1045, fig. 614 c-d (1912). 
Rhododendron primulinum Hemsley in Gard. Chron. ser. 3, XLVIL 4, 229 
fig. 101 (1910). 
