Rhododendron arboreum

subsp. var.
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Standard Cyclopedia of Horticulture

Rhododendron arboreum, Smith. Fig. 3383. Large shrub or tree, attaining 40 ft.: lvs. oblong to lanceolate, acute, rugose above, distinctly veined and whitish or ferrugineous-tomentose beneath, 4-6 in. long: clusters dense; pedicels short; calyx minute; corolla campanulate, blood-red, pink, or white, usually spotted, 1-1 1/2 in. across; ovary ferrugineous-woolly or mealy, usually 7-9-celled. March-May. Himalayas. B.R. 890. P.M. 1:101. Gn. 64, p. 415. G.W. 6, p. 595. Var. album, DC. (R. album, Sweet, not Blume). Fls. white, spotted purple: lvs. ferrugineous beneath. G. C. III. 29:246. Var. cinnamomeum, Lindl. Fls. white, slightly blushed, darker spotted than the preceding: lvs. cinnamon-brown beneath. B.R. 1982. var. limbatum, Hook. Fls. with rosy limb and white throat, blotched purple at base: lvs. white beneath. B.M. 5311. Var. Kingianum, Hook. (R. Kingianum, Watt). Shrub: lvs. broader, strongly bullate, very dark: fls. deep scarlet; filaments rose-colored; calyx larger. G.C. III. 26:306. B.M. 7696. Var. nilagiricum, Clarke. Fls. rose-colored to deep crimson, spotted: lvs. ferrugineous beneath. B.M. 4381. Gn. 36:54. Var. puniceum, DC. Fls. purple or scarlet: lvs. white beneath. Var. Windsorii, Voss (R. Windsorii, Nutt.). Fls. deep crimson-scarlet; calyx with elongated lobes: lvs. white beneath. B.M. 5008.— This species is tender and suited only for warmer temperate regions, but has been crossed with hardy varieties and its blood is recognizable in many of our most beautiful hardy hybrids. The above text is from the Standard Cyclopedia of Horticulture. It may be out of date, but still contains valuable and interesting information which can be incorporated into the remainder of the article. Click on "Collapse" in the header to hide this text.

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References

• Standard Cyclopedia of Horticulture, by L. H. Bailey, MacMillan Co., 1963

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