2938 



RHODODENDRON 



RHODODENDRON 



D. Margin of hs. usually ciliale: 



Ivs. persistent 13. praecox 



DD. Margin of Ivs. glabrous. 



E. Lvs. obtuse or obtusish at the 

 ends, sometimes partly 



persistent 14. dahuricum 



EE. Lvs. acute at the ends, decidu- [turn 



ous: fls. larger 15. mucronula- 



AA. Corolla with a cylindric tube thrice as [florum 



long as the lobes 16. jasmini- 



1. micranthum, Turcz. Shrub, to 8 ft.: Ivs. lanceo- 

 late or oblanceolate, obtuse or acutish, glabrous above, 

 densely ferrugineous-lepidote beneath, %-lM in. long: 

 fls. in dense many-fld. clusters, white, campanulate, 

 K-^in. across, lobes oblong or oval, longer than tube; 

 stamens longer than corolla, glabrous; style shorter 

 than stamens; sepals lanceolate, ciliate, J^in. long. 

 June, July. Manchuria to W. and Cent. China. B.M. 

 8198. Very distinct species, resembling Ledum with its 

 dense clusters of small white fls. and exserted stamens 

 and with its small Ivs. It has proved perfectly hardy 

 at the Arnold Arboretum and is very floriferous even 

 as a small plant. 



2. ferrugineum, Linn. Shrub, 2 ft. high, glabrous: 

 Ivs. elliptic to oblong-lanceolate, acute, densely lepidote 

 beneath, 1-2 in. long: clusters many-fld.; calyx-lobes 

 short, obtuse; corolla funnelform-campanulate, with the 

 tube about twice as long as limb, pink or carmine, 

 about ^>in. across. June-Aug. Mountains of Cent. Eu. 

 L.B.C. 1:65. Gn. 29, p. 358. G. 8:610 Dwarf, 

 hardy shrub, handsome for rockeries. Var. album, 

 Sweet, has white fls. 



3. hirsutum, Linn. Shrub, 3 ft. high, with hirsute 

 branches: Ivs. oval to oblong, ciliate, light green and 

 glandular-lepidote beneath, y<-\ in. long: clusters 

 many-fld.; calyx-lobes lanceolate, as long as ovary; 

 corolla similar to that of the preceding, lobes shorter. 

 June, July. Alps. L.B.C. 5:479. B.M. 1853. L.D. 

 6:425. Much like the preceding, but usually thrives 

 better in cult, and does not dislike limestone soil. 



4. arbutifdlium, Hort. (R. daphmndes, R. Hdmmondii, 

 and R. olesefolium, Hort. R. Wilsonii, Hort., not Nutt.). 

 A hybrid of R. ferrugineum and R. minus. Dense 

 shrub, 4 ft. high: Ivs. elliptic to elliptic-lanceolate, acute 

 at both ends, 1 J-3 in. long: fls. similar to those of R. 

 ferrugineum, but larger. June, July. Of garden origin. 

 Handsome hardy shrub, perhaps best known under the 

 name of R. Wilsonii', this name, however, had been 

 given previously to another hybrid between two Himal- 

 ayan species and should not be used for this plant. 



5. myrtifSlium, Lodd. (R. ovalifblium, Hort. R. 

 ovdtum, Hort., not Hook.). Hybrid between R. minus 

 and R. hirsutum, much like the preceding, but Ivs. 

 generally smaller and broader, less densely lepidote 

 beneath, 1-2 J^ in. long, sometimes sparingly ciliate 

 when young: fls. longer-pedicelled and calyx-lobes 

 narrower and longer. June, July. L.B.C. 10:908. 

 Originated in the nursery of Loddiges. 



6. minus, Michx. (R. punctatum, Andr. R. Cuth- 

 bertii, Small). Straggling shrub, to 10 ft.: Ivs. elliptic 

 to elliptic-lanceolate, acute at both ends, sometimes 

 acuminate, glabrous above, glandular-lepidote beneath, 

 1J/2-4 in. long: heads about 6-8-fld.; calyx short; 

 corolla funnelform-campanulate, about 1 in. across, 

 rosy pink, the upper lobe spotted greenish, lepidote 

 outside; tube nearly cylindric, longer than the ovate 

 crisped lobes. June, July. N. C. to Ga. and Ala. B.M. 

 2285. Fls. appear with or after the new Ivs. Var. 

 Harbisonil, Rend. Fls. larger, !*/ in. across, in dense, 

 about 10-fld. heads. Ga. Handsomer than the type. 



7. carolinianum, Rehd. (R. punctatum, Small, not 

 Andr.). Shrub, to 6 ft., usually low and compact: Ivs. 

 oval to narrow-elliptic, acutish or shortly and abruptly 

 acuminate, broadly cuneate at the base, glabrous above, 

 ferrugineous-lepidote beneath, often very densely so. 



2-3 in. long: fls. in dense 5-10-fld. heads, broadly funnel- 

 form-campanulate, about \Y<i in. across, pale rosy purple 

 or rarely whitish, not or only slightly spotted; tube 

 gradually widened, as long or shorter than the ovate 

 lobes, glabrous or nearly so outside. May, June. N. C. 

 B.R. 37. G. 31:619 (as R. punctatum) .-^-On account of 

 its compact habit and larger fls. superior as an orna- 

 mental plant to the preceding. 



8. Keiskei, Miq. Low, sometimes procumbent shrub : 

 Ivs. elliptic to lanceolate, acute, dull green above, lepi- 

 dote beneath, l%-3 in. long: clusters 2-5-fld.; calyx 

 minute; corolla broadly funnelform, divided to the 

 middle into rounded lobes, pale yellow, \Yi in. across; 

 stamens much exserted. May. Japan. B.M. 8300. 



9. Augustini, Hemsl. Shrub, to 20 ft.: branchlets 

 pubescent while young: Ivs. elliptic-ovate to oblong- 

 lanceolate or lanceolate, acute or acuminate, broadly 

 cuneate at the base, pale green beneath and lepidote 

 and hirsute on the midrib and petiole, 13^-2J^ in. long: 

 fls. 3-6; calyx-lobes short, ciliate; corolla broadly cam- 

 panulate, 13/2-2 in. across, pale purple or rosy pink, 

 rarely nearly white; lobes much longer than tube; 

 stamens as long or slightly shorter than corolla, style 

 longer. Cent, and W. China. B.M. 8497. G.C. III. 

 52:4. F.S.R. 3:162. R.H. 1909, p. 18. 



10. yunnanense, Franch. Shrub, to 6 ft.: lys. 

 elliptic-lanceolate, acute, cuneate at the base, with 

 scattered stiff hairs above and on the margin, or some- 

 times nearly glabrous, pale green below and sparsely 

 lepidote, 2J^-3 in. long: fls. 3-8; calyx minute; corolla 

 broadly funnelform, 2 in. across, white, the upper lobes 

 spotted blood-red, lobes longer than tube; stamens 

 about as long as lobes, style longer. May. S. W. China. 

 B.M. 7614. G.C. III. 39:399; 46:68; 54:396. G. 32:69; 

 36:305. Gn. 78, p. 317. M.D.G. 1903:173. F.S.R. 

 2:360. 



11. yanthinum, Franch. (R. concinnum, Hemsl. & 

 Wilson and Hort., not Hemsl. R. Benthamidnum, 

 Hemsl. R. atroviride, Dunn). Shrub, to 10 ft.: Ivs. 

 ovate-elliptic, acute, rounded or sometimes broadly 

 cuneate at the base, glaucescent and rather densely 

 lepidote beneath, 1J4-2K in. long: fls. 3-6; calyx 

 minute; corolla funnelform-campanulate, 1J4 m - tong 

 and as broad, purple or rosy purple, sometimes white, 

 glabrous outside, tube about as long as lobes; stamens 

 somewhat shorter than lobes, style longer. June. W. 

 China. Var. lepidanthum, Rehd. & Wilson. Corolla lepi- 

 dote and pubescent outside, dark purple : Ivs. broader. 



12. racemdsum, Franch. Shrub, to 6 ft.: Ivs. elliptic 

 to oval or obovate, obtuse or acutish, rounded or 

 broadly cuneate at the base, glabrous above, glaucous 

 below and lepidote, %-lJ4 in. long: fls. 1-3, from 

 axillary buds usually crowded at the end of the 

 branches, sometimes along the branches; corolla fun- 

 nelform-campanulate, %in. across, rose-pink, lobes 

 oblong, about as long as tube; stamens and style 

 exserted. B.M. 7301. G.C. III. 12:63; 47:343. Gn. 

 42:320. G. 28:224. Gt. 57:1577, pp. 562, 563. G.W. 

 6, p. 43 (as R. rigidum); 14, p. 271. R.H. 1912, p. 134. 

 It flowers profusely when still very small. 



13. prsecox, Carr. Hybrid between R. ciliatum and 

 R. dahuricum. Low shrub with persistent, elliptic or 

 oval Ivs., sparingly ciliate or glabrous, ferrugineous- 

 lepidote beneath, 1-2 in. long: clusters few-fld.; calyx- 

 lobes ovate, ciliate; corolla broadly funnelform, pale 

 purple or lilac, \Yi in. across. March, April. Of garden 

 origin. R.H. 1868:210. Gn. 38:32; 59, p. 277; 61, 

 p. 428; 71, p. 151. G.C. II. 17:295; III. 12:771. Gt. 

 50, p. 135; 56:1567. G.W. 5, p. 267. G. 35:109. Less 

 hardy than the following species, but handsomer. 

 Here belongs also Early Gem, with larger pale lilac fls. 

 and the Ivs. somewhat more ciliate. G.C. II. 9:336. 



14. dahuricum, Linn. (Azalea dahurica, Koch). 

 Shrub, to 10 ft.: Ivs. deciduous or sometimes partly 



