AN ENCYCLOPAEDIA OF HORTICULTURE. 



293 



Rhododendron continued. 



with a woolly throat and a spreading limb of roundish, undulately- 

 curled segments ; stamens eight, inclosed. April and May. 

 I. oval, rusty beneath from lepidoted tomentum, biennial, 

 coriaceous, terminating in a reflexed mucrone. Branchlets 

 downy, h. 1ft. to lift. Central and Northern Asia, 1820. 

 Hardy. (B. M. 3947.) 



Fio. 366. FLOWERING BRANCHLET OF RHODODENDRON 



ARBOREUM. 



B. arboreum (tree-like). 

 in dense heads ; calyx 



vhite, rose, or blood-colour, disposed 

 it ; corolla campanulate ; stamens 



ten. March to May. I. 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. A 

 magnificent, 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. Campbellice.) This species has been largely used for hybridis- 

 ing purposes ; many of its progeny, however, are early-flowering, 

 and liable to be injured bv spring frosts. Some of them are 

 mentioned herewith : R. altaclerense (B. M. 3423), R. Russell- 

 ianum (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 : 



B. a. album (white), fl. white, with some purple dots above on 

 the inside. 1. ferruginous beneath. (B. M. 3290; B. R. 1684.) 



B. a. cinnamomcuin (cinnamon-leaved). /. white, with purple 

 and yellow spots. 1. cinnamon-coloured beneath. (B. R. 1982.) 



B. a. c. roseum (rosy). A splendid sub-variety, having rose- 

 coloured flowers 2iin. in diameter. (B. M. 3825.) 



B. a. limbatum (bordered), fl., corolla limb rose-colour, gra- 

 dually fading into an almost pure white throat, marked at the 

 base with a deep blood-red blotch, broad. Half-hardy. (B. M. 

 5311.) 



B. a. puniccum (purple), fl. either purplish or of an intense 

 red-scarlet colour ; corolla segments sub-bilobed at apex, crenate, 

 sub-undulated. I. covered below with velvety-silvery, adpressed 

 pubescence. (B. R. 890 and H. E. F. 168, under name of R. ar- 

 ooreum. ) 



B. a. roseum (rosy), fl. rose-colour. I. ferruginous beneath. 

 (B. K. 1240 ; S. B. F. G. ser. ii. 339.) 



B. argenteum (silvery). A synonym of R. grande. 



B. Auckland!! (Lord Auckland's).* fl. the largest of the genus ; 

 calyx platter-shaped, liin. in diameter ; corolla firm, rather fleshy, 

 pure white, tinged with pink, veiny ; tube short, yellowish ana 

 rose-coloured towards the base; limb spreading, Sin. to 5in. in 

 diameter ; peduncles longer than the petioles, red or green. May. 

 I variable in size and breadth, 4in. to lOin. long, coriaceous, 

 oblong-elliptical, scarcely approaching to lanceolate, acute, 

 cordate at base, full green above, paler below ; petioles 2i 



Branches sub-erect, copiously leafy, h. 4ft to 8ft 

 Sikkim, 1850. (R. S. H. xi.) SYN. R. ~ 

 (B. M. 5065). 



Grijfithianum Aucklandii 



I. barbatum (bearded), fl. deep puce or blood-colour, moderate- 

 sized, collected into a compact, globose head 4in. to 5in. in 

 diameter ; calyx large, scarcely silky, deeply cut into five leaf-like 

 lobes Jin. long. l. t when young, sparingly hairy and ciliated ; 

 adults 5in. to Yin. long, liin. to 2in. or more wide, elliptic-lanceo- 

 late, acute, rather broader above the middle ; margins reflexed 



Rhododendron continued. 



and rough with hard cilise ; petioles Jin. long, slightly tnbercled 

 and beset with, long, rigid, black set* or hairs, which often 

 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 f urf uraceous sub-tomentose. 

 SYN. R. Smithii (B. M. 5120). 



R. blandfordlaeflorum (Blandfordia-flowered).* fl. 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 2i|n. long ; stamens ten ; heads five to ten- 

 flowered. 2. 2in. to 3in. long, coriaceous in luxuriant plants, 

 lanceolate, acuminate, shortly petiolate, ferruginously lepidoted 

 beneath. Branchlets slender, twiggy, lepidoted. A. 8ft. Hima- 

 layas, 1851. (B. M. 4930.) 



B. Boothii (Booth's). H. yellow, campanulate, disposed in many- 

 flowered corymbs ; calyx leaf-like, membranous, the segments 

 oval, obtuse, glabrous, i. thickly coriaceous, rhomboid, ovate, 

 acuminate, 4in. to 5in. long, 2in. to 2iin. broad, scaly beneath, 

 densely ciliated on the margins, h. 5ft. to 6ft. Bhotan. This is 

 found growing as an epiphyte on Oak-trees in its native place. 

 (I. H. 1858, Hi.) 



B. Brookeanum (Sir James Brooke's), fl. 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. I. 6in. 

 to 9in. 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 epiphytal or 

 terrestrial shrub. (B. M. 4935 ; F. d. S. v. 480 ; G. C. 1871, 236.) 



B. B. gracilis (slender).* fl. pale yellow, freely produced on 

 young plants in trusses of ten to twelve. I. light green, elliptic- 

 lanceolate. 1871. (J. H. S. iii. 85.) 



B. californicum (Californian). /. many, in terminal umbels ; 

 calyx small, slightly pilose ; corolla rose-purple, broadly campanu- 

 late, the lobes yellow-spotted within, and undulated ; stamens 

 ten, shorter than the corolla. June. I. 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).* fl. in corymbs of four or five, 

 on short, scaly peduncles ; calyx very scaly, short, tive-lobed ; 

 corolla pure white, slightly tinged with yellow-green, Sin. long 

 and broad, tubular-cainpanulate, somewhat ringent, deeply tive- 

 lobed ; stamens eighteen to twenty, included. May. I. Sin. to 

 5in. 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. A. 3ft. 

 Bhotan. (B. M. 5002.) 



R. camelliaaflorum (Camellia-flowered). /. solitary or twin, on 

 short, curved peduncles ; calyx segments thick, obtuse ; corolla 

 pure white, with a faint rosy tinge, rather thick, lepidoted, liin. 

 across. April. I. at the tips of the branches, differing in little 

 but size from those of R. Maddeni, 2iin. to 3in. long. Stems 2ft. 

 to 6ft. long, seldom thicker than a goose-quill. Branches long, 

 generally pendulous. Sikkim, 1851. (B. M. 4932; B. S. H. 

 xxviii.) 



R. campanulatum (bell-flowered).* fl. pale lilac, with a few 

 purple spots, or rose-colour, corymbose ; calyx lobes very short ; 

 corolla campanulate, about 2in. in diameter, with flat, entire 

 lobes, rounded at the apex ; pedicels glabrous. April. I. 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. ceruffinonum (B, S. H. 

 xxii.). 



B. c. seruginosum (verdigris-coloured). A form having the 



er surface of the leaves clothed with 

 tomentum. 



under 



verdigris - coloured 



B. o. Batcman! (Bateman's). A larger-flowered, more robust- 

 habited form. (B. M. 5387.) 



B. c. Wallichii (Wallich's). /., corolla more brightly coloured 

 than in the type. I. elliptic or oblong, loosely tomentose 

 beneath, often caducous ; petioles densely woolly. (R. S. H. v.) 



B. campylocarpum (curved-fruited).* fl. honey-scented, hori- 



zontal and nodding, six to eight in a terminal head, on slender 

 pedicels ; calyx tive-lobed, glandulo.se ; corolla tinged of a sulphur 

 hue, and always spotless, truly campanulate, nearly 2in. long, 

 broader across the five spreading lobes, which are finely veined. 

 June. Capsules curling upwards. I. coriaceous, but not thick, 

 2in. to 3Ain. long, liin. to 2in. broad, cordate at base, rounded 

 and mucronate at the apex, on slender petioles Jin. long. Ulti- 

 mate brauchlets, as well as the peduncles and pedicels, glandular- 

 pilose. A. 6ft. Sikkim, 1851. A twiggy, branched bush. (B. M. 

 5968; R. S. H. xxx.) 



B. catawbiense (Catawban). fl. lilac-purple ; calyx lobes small ; 

 corolla broadly campanulate ; pedicels (and capsule) rusty -pubes- 

 cent July. i. oval or oblong, rounded at both ends, smooth, 



