2946 



RHODODENDRON 



RHODODENDRON 



Hong-Kong. B.R. 33:3. R. fastigidtum, Franch. (1). Very dwarf, 

 flowering when only 4 in. high: Ivs. closely crowded, ovate, J^-J^in. 

 long, covered with rusty dots: fls. bright lilac-rose, J^-l in. across. 

 W. China. R. fastudsum var. fldre-pleno, Van Houtte. Hybrid of 

 R. catawbiense and R. ponticum. Fls. lilac-purple, semi-double. 

 F.S. 2:143. Almost hardy. R. fldvidum, Franch. (R. primulinum, 

 Hemsl.) (1). Shrub, to 6 ft.: Ivs. ovate-oblong, densely lepidote on 

 both surfaces, /4r%in. long: fls. 3-5, yellow, rotate-campanulate, 

 1J4 in. across; stamens 10. W. China. B.M. 8326. G.C. III. 

 47:229. J.H.S. 36, p. 55, fig. 78. R. floribiindum, Franch. (2). 

 Shrub, to 15 ft. or small tree: Ivs. lanceolate, acute at both ends, 

 slightly bullate, white or grayish tomentose beneath, 3-5 in. long: 

 fls. 8-12, rose-colored, \Yi in. across. W. China. R. Fordii, 

 Hemsl. (2). Shrub: Ivs. obovate-lanceolate, glabrous, 2-3 in. long: 

 fls. few, white, flushed pinkish outside, 1 Yi in. across. S. China. 

 B.M. 8111. R. formdsum, Wall. (R. Gibsonii, Paxt.). (1). Slender 

 shrub, 8 ft. high: Ivs. oblong-pbovate, cilia te, pilose above, glaucous 

 and lepidote beneath, 1-2% in- l9ng: fls. few, funnelform-campanu- 

 late, white, tinged pink, l>-2 in. across. Himalaya Mts. B.M. 

 4457. P.M. 8:217. G.C. III. 17:711. G. 35:157. R. Forster- 

 idnum, Hort. Hybrid of R. Edgeworthii and R. Veitchianum. Fls. 

 large, white. Gn. 76, p. 272. G.W. 3, p. 605. G. 27:251. R. 

 Fortunei, Lindl. Shrub, 12 ft. high, with stout branches, glabrous: 

 Ivs. oblong, acute, glaucous beneath, 5-7 in. long: fls. many, broadly 

 campanulate, 7-lobed, rosy lilac; stamens 14. Cent. China. B.M. 

 5596. Almost hardy. Var. Houlstonii, Rehd. & Wilson. Lys. nar- 

 rower, smaller: pedicels more glandular. R. fragrans, Maxim. (1). 

 Low shrub: Ivs. ovate-elliptic, ferrugineous-lepidote beneath, J^-l 

 in. long: fls. 10^15, yellowish white, funnelform, J^in. across; 

 stamens 5. E. Siberia. R. fragrans, Lodd., see No. 28, R. azale- 

 oides. R. fragranttssimum, Burb. Supposed hybrid between 

 R. ciliatum and R. Edgeworthii. Fls. large, white, faintly tinged 

 rose, fragrant. J.H. III. 57:619; 62:581. R. fulgens, Hook. f. (2). 

 Allied to R. campanulatum, but smaller: fls. deep blood-red, in a 

 densehead. Himalayas. B.M. 5317. F.S. 8:789. Gn. 67:376. R. 

 Gauntlettii, Hort. Hybrid between R. Griffithianum and proba- 

 bly R. ponticum. Fls. pale flesh-color, changing to white, 4 in. 

 across. G. 32:131; 34:701. R. gemmtferum, Bean. Hybrid 

 between a true rhododendron and an azalea. Dwarf shrub: Ivs. 

 deciduous or half-evergreen, oval to elliptic, obtuse or acutish, 

 mucronulate, loosely villous on both sides, 1 Yv-1 in. long: fls. light 

 carmine, funnelform-campanulate, tube somewhat longer than the 

 lobes, 1 Yi in. across; stamens 5-10; style exserted, glabrous; ovary 

 villous. Origin unknown. Hardy at the Arnold Arboretum.- R. 

 Gibsonii, Paxt.=R. formosum. R. glaucum, Hook. f. (1). Small 

 shrub, 3 ft. high: Ivs. elliptic-oblong, lepidote, glaucous beneath, 2-4 

 in. long: fls. 5-8; campanulate, rose-colored, 1 Yi in. across. Himal- 

 ayas. B.M. 4721. F.S. 7:672. H.F. 1859:241. R. Gowenidnum, 

 Sweet. Allied to R. azaleoides and supposed to be a cross between 

 a hybrid evergreen rhododendron and R. nudiflorum or R. 

 viscosum: Ivs. oblong-lanceolate, pubescent on both sides while 

 young: fls. purplish pink; calyx-lobes linear. R. grdnde, Wight (R. 

 argenteum, Hook. f.). (2). Tree, to 40 ft. : Ivs. pblong-obovate, acute, 

 glabrous, white beneath, 8-12 in. long: fls. in a dense head, cam- 

 panulate, 5-8-lobed, rosy at first, changing to white, 2-3 in. across. 

 Himalayas. B.M. 5054. Gn. 48:102; 59, p. 342. F.S. 5:473-6. 

 G.C. II. 17: suppl. June 10; III. 4:158 (suppl); 27:105; 45:290. 

 R.H. 1888, p. 197. F.S.R. 3, p. 37. Gt. 60:1588. Var. rdseum, 

 Hook. Fls. rose-colored. B.M. 6948. R. Griffithianum, Wight. 

 Shrub, 8 ft. high, glabrous: Ivs. oblong, pale beneath, 6-12 in. long: 

 fls. 4-6, broadly campanulate, white, fragrant, 3 in. across or more. 

 Himalayas. Gt. 15:517; 51, p. 282. G.C. III. 39:243. Var. 

 Aucklandii, Hook. Fls. 7 in. across. B.M. 5065. Gn. 20:328. 

 R.H. 1855:81. G.C. II. 22:657; 111.12:697. J.H. III. 57: 157. 

 Remarkable for its very large fls. R. hsematochilum, Craib=R. 

 oreodoxa. R. Halopednum, Andr6. Hybrid of R. arboreum and 

 R. Griffithianum. Fls. large, blush. R.H. 1896:428. R. Hanced- 

 num, Hemsl. (1). Shrub, to 3 ft.: Ivs. obovate to elliptic-lanceolate, 

 acute, lustrous above, fulvous beneath, minutely scaly, 1-3 in. 

 long: fls. many, in dense heads, yellow, campanulate-funnelform, 

 J^in. across; stamens 10. W. China. R. Hdrrisii, Hort. Hybrid 

 of R. arboreum and R. Thomsonii. Fls. deep crimson, spotted 

 within. R. Harrovidnum, Hemsl.=R. polylepis. R. H6dgsonii, 

 Hook, f . Shrub or small tree, attaining 20 ft. : Ivs. narrowly obovate- 

 oblong, whitish or brownish tomentose beneath, 8-18 in. long: fls. in 

 a dense head, broadly campanulate, pale purple, 2 in. across. 

 Himalayas. B.M. 5552. R.H. 1855:421; 1866: 191. Gn. 73, p. 588. 

 R. Hobkeri, Nutt. (2). Shrub, 14 ft. high: Ivs. oblong-oval, gla- 

 brous, glaucous below and sparingly chaffy on the veins: fls. cam- 

 panulate, deep crimson, 1-1 M in. across; calyx cup-shaped. Him- 

 alayas. B.M. 4926. R. Houlstonii, Hemsl. & Wilson=R. For- 

 tunei var. Houlstonii. R. Hunnewettidnum, Rehd. & Wilson (2). 

 Shrub, to 15 ft.: Ivs. oblanceolate or oblong-lanceolate, acuminate, 

 glabrous above, white-tomentose beneath, 3-4 Yi in. long: fls. many, 

 white, spotted, broadly campanulate, 2 in. across. W. China. R. 

 hypoglaucum, Hemsl. (2). Lvs. elliptic, acute, 2-3 in. long: corolla 

 snow-white; segms. notched. Cent. China. B.M. 8649. R. imbri- 

 cdtum, Hort. Apparently a hybrid of R. ponticum with a hardy 

 species of the same group. Dwarf, very compact shrub: Ivs. crowded, 

 oblong, obtuse, glabrous, lustrous, convex and somewhat bullate 

 above, \Yr-1Yi in. long: pedicels puberulous; fls. pale lilac-purple, 

 2 in. across; style and the sometimes petaloid stamens short; ovary 

 glabrous. Origin unknown. Hardy at the Arnold Arboretum. 

 R. insigne, Hemsl. & Wilson (2). Shrub, to 18 ft.: lys. lanceolate- 

 oblong, acute at both ends, lustrous above, grayish tomentose 

 beneath, 3^-5 in. long: fls. many, pink to white, broadly cam- 

 panulate, lJ^-2 in. across; stamens 14 or more. W. China. 

 R. intermedium, Tausch. Hybrid between R. ferrugineum and R. 

 hirsutum and intermediate between the two. Has been found 

 occasionally with the parents. R. intricdtum, Franch. (1). Shrub, 

 to 3 ft.: Ivs. elliptic or ovate, obtuse, densely lepidote on both 



sides, silvery beneath, J^-^in. long: fls. 3-5, rosy purple, funnel- 

 form, Hin. across. W. China. B.M. 8163. G.C. III. 41:262. 

 Gn. 78: 190, 294. R.B. 35, p. 108. J.H.S. 33, p. 49, fig. 21. J.H. III. 

 54:343. M.D.G. 1909: 145. R. irrordtum, Franch. Shrub, several 

 feet high, glabrous: Ivs. oblong to oblong-lanceolate, pale beneath, 

 3-4 in. long: fls. many, funnelform-campanulate, 1 Yi in. long, 

 white, tinged pink. Yunnan. B.M. 7361. G.C. III. 49:350. R. 

 Jdcksonii, Hort. (G. 28: 183) is said to be the same as R. venustum. 

 R. javdnicum, Blume (1). Large shrub, glabrous: Ivs. elliptic to ob- 

 long, acute.minutely lepidote beneath, 3-6 in. long: fls. many, funnel- 

 form, orange-yellow to brick-red, 2 in. across. Winter. Malayan 

 Archipelago and Penin. B.M. 4336. F.S. 3:293, 294; 6 -.576. P.M. 

 15:217. Var. tubifldrum. Hook. Lvs. smaller: fls. smaller and with 

 longer tube, salmon-pink. B.M. 6850. R. Jenkinsii, Nutt.=R. 

 Maddenii. R.kamtschdticum, Pall. (Azalea kamtschatica, Kuntze). 

 Belongs to the section Therorodion, characterized by the fls. being 

 borne at the end of the young branchlets. Prostrate undershrub: 

 Ivs. deciduous, obovate or spatulate, obtuse, ciliate, 1 %-2 Yi in. 

 long: fls. 2-3, in terminal racemes, rotate-campanulate, 1 Yi in. 

 across, carmine-purple, spotted; stamens 10; ovary pilose. E. 

 Siberia, N. Japan and Alaska. B.M. 8210. Gt. 36:1260. G.C. III. 

 44:128. G.W. 13, p. 554. Hardy, but difficult to cult. R. Ken- 

 drickii, Nutt. (2) . Large shrub : Ivs. lanceolate, acuminate, glabrous, 

 pale beneath, 4-7 in. long: fls. many, campanulate, bright scarlet, 

 2 in. across. Himalayas. Var. latifdlium, Hook. Lvs. broader, 

 oblong-lanceolate, glandular pubescent beneath when young. B.M. 

 5129. R. Kesselringii, Wolf. Hybrid between R. ponticum and R. 

 Smirnovii. Low shrub: Ivs. soon glabrous beneath: fls. rosy purple 

 with darker margin. R. kewense, W. Wats. Hybrid of R. Griffith- 

 ianum and R. Hookeri. Fls. large, in loose heads, crimson, pink or 

 almost white. Gn. 42:474; 52:284; 76, p. 319. G.C. III. 23:291. 

 G.M. 44:356; 50:211. R. Keysii, Nutt. Belongs to the section 

 Keysia characterized by the tubular corolla with short erect lobes. 

 Shrub, 2-6 ft. high, with ferrugineous branches: Ivs. elliptic- 

 lanceolate, glabrous, pale and sparingly scaly beneath, 31 in. long: 

 fls. many, tubular, with short erect lobes, brick-red, 1 in. long. 

 July. Himalayas. B.M. 4875. F.S. 11:1110. Gt. 12:415. Gn. 48, p. 

 106. R. Kotschyi, Simonkai (R. myrtifolium, Schott & Kotschy, 

 not Lodd.) (1). Low shrub: Ivs. oblong-obovate, obtuse, mucronu- 

 late, shining above, ferrugineous-lepidote beneath, J^-l in. long: 

 fls. few, tubular-funnelform, with the tube outside pubescent, 

 inside villous, carmine, ?^in. long; style shorter than ovary. 

 July. Carpathian Mts. Gn. 56, p. 159. R.F.G. 17:1157, figs. 

 2, 3. R. Idcteum, Franch. (2). Tree, to 30 ft.: Ivs. cordate, ellip- 

 tic-ovate, brownish tomentulose beneath, 5-10 in. long: fls. in 

 dense heads, broadly campanulate, G-lobed, white, 1 in. across. 

 Yunnan. B.M. 8372. R.H. 1912, pp. 375, 376. R. landtum, Hook. 

 f. (2). Shrub or small tree: Ivs. obovate to obovate-oblong, with 

 tawny woolly tomentum beneath, and also above when young, 

 3-5 in. long: fls. 6-10, broadly campanulate, yellow, spotted red 

 within, 2-2 Yi in. across. Himalayas. F.S. 7:684. R.H. 1855:161. 

 Almost hardy. R. lancifdlium, Moench=R. ponticum. R. lanci- 

 fdlium, Hook. f.=R. barbatum. R. lapponicum, Wahl. (1). 

 Depressed shrub; Ivs. oval or oblong, obtuse, Y~Yi in. long: fls. 

 3-6, broadly campanulate, purple, J-iin. across; stamens 5-8. July. 

 Mountains of N. Amer., N. Eu., N. Asia. B.M. 3106. M.D.G. 

 1910:136. Hardy. R. lepiddtum, Wall. (R. elaagnoides, Hook, f.) 

 (1). Slender shrub, 4 ft. high: Ivs. obovate to lanceolate, glaucous- 

 green, lepidote beneath, Yv-1-Yi in. long: fls. 1-3, sometimes many, 

 slender-pedicelled, broadly campanulate, yellow or dull purple, 

 spotted within, Hin. across; stamens usually 8. Himalayas. B.M. 

 4657. Gn. 15:182. G.C. II. 22:297. J.F. 4:343. Var. chlordnthum, 

 Hook. (R. salignum, Hook. f.). Fls. greenish or pale yellow, spotted 

 greenish: Ivs. narrow. Var. obovdtum, Hook. Fls. dark purple, 

 larger: Ivs. obovate. R. linearifdlium, Sieb. & Zucc. (Azalea lineari- 

 folia, Hook.) (6). Allied to R. ledifolium. Lvs. linear-lanceolate: 

 corolla pink, deeply divided into 5 linear-lanceolate segms. Japan. 

 B.M. 5769. G.M. 36:104. R. Lobbii, Veitch (1). Slender shrub, 

 allied to R. malayanum: Ivs. elliptic-oblong: fls. almost salver- 

 shaped, with slender, curved tube, bright crimson. Winter. Borneo. 

 The R. Lobbianum, Moore (F.M. 1:10), belongs to R. Brook- 

 eanum. R. Ldderi, Hort. Hybrid between R. Fortunei and R. 

 Griffithianum. Fls. white to soft rose, 6-lobed, 5-6 in. across, fra- 

 grant. G.C. III. 50:30; 51:360. Not to be confused with Loder's 

 hybrid which is a cross of unknown origin, apparently also of R. 

 Griffithianum. R. longesguamdtum, Schneid. (R. Brettii, Hemsl.) 

 (2). Shrub, to 15 ft.: scales of If.-buds persistent, elongated: Ivs. 

 obovate-oblong, acute, rounded at the base, glabrous beneath 

 except the villous midrib and petiole, 2^-5 in. long: fls. 6-15, rosy 

 pink, campanulate, 2 in. across. W. China. R. longistylum, Rehd. 

 & Wilson (1). Allied to R. micranthum. Shrub, to 6 ft.: Ivs. 

 oblanceolate or oblong-lanceolate, sparingly lepidote beneath, 1-2 Y* 

 in. long: fls. 10 or more, white, funnelform-campanulate, Jiin. 

 across; style exserted, 1 in. long. W. China. R.H. 1914, pp. 

 232, 233. R. lucidum, Franch.=R. decorum. R. Luscombei, W. 

 Wats. Hybrid of R. Fortunei and R. Thomsonii. Fls. large, rose- 

 red to crimson. Gn. 66, p. 392. G. 26:528. R. lutescens, Franch. 

 (1). Allied to R. racemosum. Lvs. lanceolate or ovate-lanceolate, 

 long-acuminate, sparingly lepidote, light green beneath: fls. 1-3, 

 from axillary heads, 1 in. across, yellow; stamens 10, exserted. W. 

 China. R.H. 1914:324. .R. macrocdrpos, Griff.=R. Dalhousise. 

 R. macrosepalum, Maxim. (Azalea macrosepala, Kuntze) (6). 

 Shrub, to 2 ft.: branchlets villous: Ivs. deciduous or subpersistent, 

 elliptic, 1-2 in. long: fls. umbellate, rose-lilac, spotted, 2 in. across; 

 sepals lanceolate, long, glandular -pubescent. Japan. Gt. 19:662. 

 Azalea dianthiflora, Carr. (R.H. 1891:60) is possibly a double-fid, 

 form of this species. R. macrostemon, Maxim. (6). Low half- 

 evergreen shrub: Ivs. oblong-elliptic, pubescent, about Hin. long: fls. 

 pinkish, %-l in. across; stamens twice as long as corolla. Japan. 

 R. Mdddenii, Hook. f. (1). Shrub, to 8 ft.: Ivs. short-stalked, 

 elliptic-lanceolate, ferrugineous-lepidote beneath, 4-7 in. long: fls. 



