Rose family (Rosaceae)
Description: This perennial plant has woody stems and can assume the form of a shrub or climbing vine. In the form of a shrub it is about 3-6' tall, while as a climbing vine it gets up to 10' tall if there is other vegetation nearby to cling to. The terete hairless stems are heavily armed with stout curved thorns. They are initially green, but eventually turn brown and woody. The alternate compound leaves are odd pinnate with 5-9 leaflets (a few upper leaves may have 3 leaflets). The leaflets are up to 2½" long and ¾" across. They are medium to dark green, hairless, ovate to obovate, and serrated along their margins. At the base of the petiole of each compound leaf, there is a pair of stipules with abundant slender teeth; these teeth have a bristly appearance. This is a distinctive characteristic of Multiflora Rose.
The flowering stalks produce an abundance of white flowers on spreading racemes or corymbs. Each flower is about 1½" across, consisting of 5 white petals (rarely light pink), 5 green sepals, a central column of styles, and a ring of abundant stamens with bright yellow anthers. The blooming period occurs during the late spring or early summer, and lasts about 3-4 weeks. The flowers have a typical rose-like fragrance. Fertile flowers are replaced by rather small rose hips (about ¼" across or a little more) that turn orange-red to red with maturity. The rose hips are globoid and hairless; they lack dried sepals at their outer tips. The interior of each rose hip is rather dry and fleshy, where there are several dark seeds.
Cultivation: The preference is partial sun, mesic conditions, and fertile loamy soil. Multiflora Rose is very aggressive and difficult to get rid of once it becomes established. At an open sunny site, it will develop into a shrub that produces numerous flowers, while at a shadier site with adjacent vegetation it becomes a climbing woody vine. The leaves are vulnerable to various kinds of foliar disease, particularly where there is an abundance of moisture and inadequate circulation of air.
Range & Habitat: The non-native Multiflora Rose is a common plant that probably occurs in every county of Illinois. However, it has been collected in about one-half of the counties in the state, according to official records (see Distribution Map). This species was introduced into the United States by the horticulture industry from Japan or eastern Asia after World War II, when it was advertised as a "living fence" that would promote the privacy of residential properties. It quickly escaped and has managed to spread with amazing rapidity. Habitats include open deciduous woodlands, woodland borders, thickets, weedy meadows along rivers, fence rows, powerline clearances in wooded areas, abandoned pastures, semi-shaded areas along roadsides, and any little-used open area that is reverting back into a woodlands. The Multiflora Rose is a major invader of both natural and disturbed areas.
Faunal Associations: The abundant and showy pollen of the flowers attracts various long-tongued bees, including honey bees and bumblebees. These insects are the primary pollinators of the flowers. The pollen of the flowers also attracts short-tongued Halictid bees, Syrphid flies, bee flies, and beetles. The bees collect pollen for the larvae in their nests or hives, while the remaining insects feed on pollen. The flowers of most roses do not provide nectar. Because roses are important in horticulture, the insect species that feed on their foliage, flowers, and shoots are fairly well-known and documented. These insect feeders include the larvae of shoot-boring beetles, flea beetles, scarab beetles, aphids, the larvae of sawflies, the larvae of gall wasps, the larvae of moths, and thrips (see the Insect Table for a listing of these species). Rose hips are eaten by such upland gamebirds and songbirds as the Greater Prairie Chicken, Ring-Necked Pheasant, Ruffed Grouse, Yellow-Breasted Chat, Northern Mockingbird, and Fox Sparrow. The twigs and foliage are often browsed by the White-Tailed Deer and other hoofed mammalian browsers, notwithstanding the thorns. Rose hips are sometimes eaten by the White-Footed Mouse, while the lower shoots and foliage of young plants are occasionally eaten by the Cottontail Rabbit. The birds and mammals that eat rose hips help to distribute the seeds far and wide. The dense foliage and armed shoots of the Multiflora Rose provide excellent cover and nesting habitat for the Brown Thrasher, Northern Mockingbird, Yellow-Breasted Chat, and other songbirds.
Photographic Location: A weedy meadow near a drainage ditch at Judge Webber Park in Urbana, Illinois. This site received some shade from trees during the morning.
Comments: This species produces flowers that are smaller in size, but with greater abundance, than the native roses. It is usually quite attractive while in full bloom. Unlike the native roses, Multiflora Rose has stipules with bristly teeth at its petiole bases. In the native roses, these stipules have single teeth at their outer tips that are not bristly. The flowers of the Multiflora Rose are usually white, while the flowers of the native roses are usually pink. It resembles Rosa setigera (Wild Climbing Rose) to some extent, as they both can assume the form of a climbing vine and in the center of their flowers there is a column of united styles. However, the Wild Climbing Rose has compound leaves with fewer leaflets (usually 3, sometimes 5). Like other native roses, the flowers of the Wild Climbing Rose are larger in size and pink in color.