|Rosa multiflora subsp. var.|
It is a scrambling shrub climbing over other plants to a height of 3-5 m, with stout stems with recurved thorns (sometimes absent). The leaves are 5-10 cm long, compound, with 5-9 leaflets and feathered stipules. The flowers are produced in large corymbs, each flower small, 1.5-4 cm diameter, white or pink, borne in early summer. The hips are reddish to purple, 6-8 mm diameter.
|Standard Cyclopedia of Horticulture|
Rosa multiflora, Thunb. (R. polyanthos, Roessig. R. thyrsiflora, Leroy. R. intermedia, carr. R. Wichursae, Koch). Deciduous shrub, with vigorous, long, recurving or climbing branches: lfts. usually 9, obovate to oblong, acute or obtuse, serrate, pubescent, 3/4 -1 1/3 in. long: fls. in many-fld. pyramidal corymbs, usually white, 3/4 in. across or more; sepals ovate, abruptly acuminate; styles glabrous: fr. small, globular. June. Japan, China. —The typical form which is sometimes distinguished as var. Thunbergiana, Thory, has small single white fls. and is found in Japan and Korea. Var. cathayênsis, Rehd. & Wilson. Fls. pink, about 1 1/2 in. across, in rather flat corymbs. China. This is the wild single-fld. form from which the two following varieties have been derived. Var. carnea, Thory (var. plena, Regel. R. florida, Poir.). With double light pink fls. Var. platyphylla, Thory, with larger lvs. and larger double, deep pink fls. This is known as Seven Sisters Rose. A form of this with intense red and more numerous fls. is the well- known "Crimson Rambler," one of the best climbing roses. Many hybrids have originated in cult.; they usually show their parentage by the pectinate stipules. A hybrid with R. rugosa is R. Iwara, Sieb., with single, rather small white fls. Of the same parentage is R. yedoensis, Makino, with small pink fis. R. polyantha, Hort., not Roessig, is a trade name for hybrids with R. chinensis. The Dawson rose, or R. Dawsoniana, is a hybrid with General Jacqueminot. Hybrids with A. setigera, R. gallica, and R. Wichuraiana have also been raised.
In eastern North America, Multiflora Rose has become an invasive species, though it was originally planted as a soil conservation measure and to attract wildlife. It is readily distinguished from American native roses by its large inflorescences, which bear multiple flowers and hips, often more than a dozen, while the American species bear only one or a few on a branch.
Over time this plant has become a serious ecological problem because of its ability to grow in diverse light, soil, and moisture conditions, and because its seeds are widely broadcast by birds. Once established, it forms nearly impenetrable thickets that displace native understory plants and can become a fire hazard in wilderness areas. Some places classify Multiflora rose as a "noxious weed" . In grazing areas, this rose is generally considered to be a serious pest, though it is considered excellent fodder for goats.
Pests and diseases
Two varieties are accepted by the Flora of China:
- Rosa multiflora var. multiflora. Flowers white, 1.5-2 cm diameter.
- Rosa multiflora var. cathayensis Rehder & E.H.Wilson. Flowers pink, to 4 cm diameter.
- Standard Cyclopedia of Horticulture, by L. H. Bailey, MacMillan Co., 1963