AN ENCYCLOPZ2DIA 
OF HORTICULTURE. 298 
Rhododendron—continued. 
with a woolly throat and a spreading limb of roundish, undulately- 
curled segments; stamens eight, inclosed. April and May. 
l. oval, rusty beneath from lepidoted tomentum, biennial, 
— — ae — — Branchlets 
owny. s . to lżft. en an orthern Asia, 1820. 
Hardy. (B. M. 3947.) i 
Fig. 366. FLOWERING BRANCHLET OF RHODODENDRON 
ARBOREUM. 
R. arboreum (tree-like).* /. white, rose, or blood-colour, disposed 
in dense heads; calyx absent; corolla campanulate; stamens 
ten. March to May. J. large, coriaceous, lanceolate, acute, 
cordate at base or attenuated into a thick petiole, of a beautiful 
green above, below impressed with netted veins, glabrous, silvery 
_ or ferruginous-pubescent. h. 20ft. to 25ft. Himalayas, 1820. 
ficent, half-hardy tree, sometimes attaining a circumference 
of 150ft. See Fig. 366. (P. M. B. i. 101; R. S. H. vi., under name 
of R. Campbellie.) This species has been largely used for hybridis- 
Ing purposes; many of its progeny, however, are early-fiowering, 
and liable to be injured by spring frosts. Some of them are 
mentioned herewith: R. altaclerense (B. M. 3423), R. Russell- 
tanum (S. B, F. G, ser. ii. 91), R. Smithii (S. B. F. G. ser. ii. 50), 
R. undulatum (S. B. F. G. ser. ii. 341), R. venustum (S. B. F. G. 
ser. ii. 288). The following are varieties : 
R. a. album (white). fi. white, with some purple dots above on 
the inside. Z, ferruginous beneath. (B. M. 3290; B. R. 1684.) 
R. a. cinnamomeum (cinnamon-leaved). ji. white, with pop 
and yellow spots. Z. cinnamon-coloured beneath. (B. R. 1982.) 
a. C. roseum (rosy). A splendid sub-variety, having rose- 
coloured flowers 24in. in diameter. (B. M. 3825.) `- ; 
R. a. limbatum (bordered). fl., corolla limb rose-colour, gra- 
dually fading into an almost pure white throat, marked at the 
sare Miika deep blood-red blotch, broad. Half-hardy. (B. M. 
R. a. puniceum (purple). fi. either purplish or of an intense 
red-scarlet colour ; corolla segments sub-bilobed at apex, crenate, 
sub-undulated. Z. covered below with velvety-silvery, adpressed 
—— (B. R. 890 and H. E. F. 168, under name of R. ar- 
m. 
R. a. roseum (ros: 
y). . rose-colour. 
(B. R. 1240; S. B. F. ation ii. 339.) 
R. argenteum (silvery). A synonym of R. grande. 
R. Aucklandii (Lord Auckland’s).* fl. the larjont of the genus ; 
l. ferruginous beneath. 
R. barbatum arded). fl. d oderate- 
x . fl. deep puce or blood-colour, moderate- 
sized, collected S into a — — head, 4in. to Sin. in 
diameter ; calyx — scarcely silky, deeply — ab — 
. l, when young, sparin; airy and ciliated ; 
— bin, to Tin. long, isin, ~ A pean wide, elliptic-lanceo- 
» Acute, rather broader above the middle; margins reflexed 
BRhododendron—continued. 
and rough with hard ciliæ; petioles jin. long, slightly tubercl 
and beset with long, rigid black cote or holce OMON wie 
extend a little way up the midrib beneath. Main trunks few, 
clothed with reddish bark ; branches numerous. h. 40ft. to 60ft. 
Sikkim, 1829. Half-hardy tree. (F. d. S. 469; R. S. H. 3.) 
R. b. Smithii (Smith’s). A variety differing from the type in 
having the under surface of the leaves furfuraceous sub-tomentose. 
Syn. R. Smithii (B. M. 5120). 
R. blandfordizfiorum (Blandfordia-flowered).* A. often green 
before expansion, afterwards becoming more or less of a cinnabar 
or brick-red or orange-red on the upper part of the tube and 
limb, sometimes altogether green, at others red, even in the 
bud ; corolla lin. to 2sin. long; stamens ten; heads five to ten- 
flowered. J. 2in. to Sin. long, coriaceous in luxuriant 
lanceolate, acuminate, shortly petiolate, ferruginous] 
beneath. Branchlets slender, twiggy, lepidoted. A: bee, Hima- 
layas, 1851. (B. M. 4930.) 
R. Boothii (Booth’s). A. yellow, campanulate, disposed in many- 
flowered corymbs; calyx leaf-like, membranous, the segments 
oval, obtuse, glabrous. J, thickly coriaceous, rhomboid, ovate, 
acuminate, 4in, to din. long, 2in. to 24in, b , Scaly beneath, 
densely ciliated on the margins, A, 5ft. to 6ft. Bhotan. This is 
found mes eg an epiphyte on Oak-trees in its native place. 
(I. H. 1858, 174.) 
R. Brookeanum (Sir James Brooke’s). /l. many, in a large, 
loose, terminal umbel, on rather short peduncles; calyx absent ; 
corolla full orange or golden-tawny, between bell and funnel- 
shaped, large, thick, with an elongated tube and a limb of five 
crisped lobes ; stamens ten, as long as the tube. April. J. 6in. 
to Yin. long, firm, oblong-lanceolate, acute, full green above, the 
same or a little paler beneath, and there sparingly dotted with 
minute scales ; petioles dark purple, very short, broad, and thick. 
Branches dark purple, stout. Borneo, 1848. Stove — or 
terrestrial shrub. (B. M. 4935; F. d. S. v. 480; G. C. , 236.) 
R. B, gracilis (slender).* jl. pale yellow, freely produced on 
oung plants —— of ten to twelve. l. light green, elliptic- 
Rearend rag 1871. (J. H. S. iii. 85.) ‘ 
R. californicum (Californian). ji. many, in terminal umbels ; 
calyx small, slightly pilose ; corolla rose-purple, broadly campanu- 
late, the lobes yellow-spbtted within, and undulated ; stamens 
ten, shorter than the corolla. June. l. somewhat obovate-elliptic, 
coriaceous, acute, glabrous, shortly petiolate, one-coloured, paler 
beneath. h. 3ft. to 8ft. California. Hardy. (B. M, 4863.) 
R. calophyllum (beautiful-leaved).* M. in corymbs of four or five, 
on opa scaly Si ceo calyx very scaly, short, five-lobed ; 
corolla pure white, slightly tinged with yellow-green, 3in. long 
and broad, tubular-campanulate, somewhat ringent, — 
lobed; stamens eighteen to twenty, included. May. L to 
Sin. long, firm, rigid, coriaceous, ovate, oblong, or somewhat 
elliptical, dark glossy-green, obtuse at base, very acute at apex, . 
glaucous beneath when young, ferruginous when old, with in- 
numerable scales. Branches spreading, stout, terete. h. 3ft. 
Bhotan. (B. M. 
R. camelliæfiorum (Camellia-flowered). jl, solitary or twin, on 
short, curved peduncles; calyx segments thick, obtuse ; corolla 
` pure white, with a faint rosy tinge, rather thick, lepidoted, 14in. 
across. April. l. at the tips of the branches, differing in little 
but size from those of R. Maddeni, 24in. to Sin. long. Stems 2ft. 
to 6ft. long, seldom thicker than a goose-quill, Branches jong, 
generally pendulous. Sikkim, 1851. (B. M. 4932; R. 5. H. 
) . 
campanulatum (bell-flowered).* A. pale lilac, with a few 
—— spots, or rose-colour, cor ry calyx lobes very short ; 
corolla campanulate, about 2in. in diameter, with flat, entire 
lobes, rounded at the apex ; pedicels glabrous. April. Z elliptic, 
mucronate, obtuse or sub-cordate at base, below greyish-powdery, 
above, as well as the petioles and branchlets, glabrous. h. 4ft. 
Sikkim, 1825. Half-hardy. (B. M. 3759; L. B. C. 1944; P. M. B. 
xvi. 193; S. B. F. G. ser. ii. 241.) SYN. R. eruginosum (R. 8. H. 
xxii.). 
gruginosum (verdigris-coloured). A form having the 
Boe —* of ths leaves clothed with verdigris - coloured 
tomentum. 
R. c. Batemani (Bateman’s). A larger-flowered, more robust- 
habited form. (B. M. 5387.) ; — 
‘allichii (Wallich’s). f., corolla more brightly coloured 
n the be 1, elliptic or oblong, ly tomentose 
beneath, often caducous; petioles densely woolly. (R. S. H. v.) 
cam’ curved-fruited).* A. honey-scented, hori- 
—— and nodding, Pi to eight in a terminal head, on slender 
dicels ; calyx five-lobed, glandulose ; corolla tinged of a sulphur 
E and always spotless, truly campanulate, nearly 2in. long, 
broader across the tive sprea lobes, which are finely veined. 
' June. Capsules curling upwards. l. coriaceous, but not thick, 
Qin. to 3sin. long, lin. to Zin. broad, cordate at base, unded 
and mucronate at the apex, Tiap —— — — —— 
hlets, as well as t uncles and pedicels, y 
male biaia, Si , 1851. A twiggy, branched ne, ganca M. 
: R. S. H. xxx.) 
2 
whiense (Catawban). f. lilac-purple ; calyx lobes small; 
—— broadly pA raseda ; pedicels (and —— rusty-pubes- 
cent. July. l oval or oblong, rounded at both ends, smooth, 
