Spiraea japonica

Spiraea japonica subsp. var.	Japanese spirea
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	Rosaceae > Spiraea japonica var. ,

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Standard Cyclopedia of Horticulture

Spiraea japonica, Linn. (S. callosa, Thunb.). Shrub, 4 ft. high, with upright branches glabrous or puberulous when young: lvs. ovate to oblong-lanceolate, acute at both ends or acuminate, doubly and incisely serrate, pale bluish green and usually glabrous beneath, 1-4 in. long: fls. small, pale to deep pink, in usually much-compound and rather loose corymbs; sepals reflexed in fr.: follicles glabrous, diverging with ascending styles. June, July. Japan, China.—A very variable species. The variety most common in cult. usually under the name S. callosa is var. Fortunei, Rehd. (S. Fortunei, Planch. S. callosa, Lindl., not Thunb.). Higher, with quite terete branches: lvs. 2-4 in. long, oblong-lanceolate, acuminate, sharply and doubly serrate, with incurved, callous-tipped teeth, rugose above, bluish white beneath: corymbs very compound, rather loose; disk less developed, sometimes wanting. E. and Cent. China. F.S. 9:871. B.M. 5164. B.H. 8:129.—Handsome shrub with the young unfolding lvs. of a pretty purplish color and very large much-compound corymbs. The Japanese forms grow less high, have smaller and broader, coarsely doubly dentate-serrate lvs., not rugose and less whitish beneath; the sts. are slightly striped by the decurrent petioles and the infl. is less compound. Other varieties of Chinese origin are the two following recently intro. varieties. Var. acuminata, Franch. Lvs. ovate-oblong to lanceolate, acuminate, green and pubescent beneath, at least on the veins, 2-3 1/2 in. long: fls. pink, in terminal corymbs 4-6 in. across. Cent. and W. China. Var. ovalifolia, Franch. Lvs. oval to elliptic, acute, glabrous and glaucescent beneath, 1 1/2 - 3 in. long: fls. white, in corymbs 3-5 in. across. W. China.—Japanese forms little known in cult. are var. pubescens, Regel, with the lvs. pubescent beneath and the corymbs pubescent, and var. glabrata, Nichols. (S. glabrata, Lange), with ovate glabrous lvs. and bright pink fls. in glabrous corymbs. The following are garden forms: Var. atrosanguinea, Zabel. Fls. deep pink, in tomentose corymbs. Var. ruberrima, Zabel. Fls. deep pink, in puberulous corymbs. Var. macrophylla, Simon-Louis. Lvs. becoming 6 in. long, bullate: corymbs small. Var. variegata, Hort. Lvs. variegated with yellowish white. Most of the other forms enumerated as varieties under this species are hybrids. CH 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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