oriental bittersweet

Celastrus orbiculatus Thunb.

U.S. Nativity: Exotic
Habit: Vine

Synonym(s): Asiatic bittersweet

Celastrus orbiculatus is a perennial deciduous, climbing, woody vine that can grow to lengths of 60 ft. (18.3 m) and up to 4 in. (10 cm) in diameter. The striated bark is brown to dark brown. The smooth glabrous twigs can range from light gray to dark brown in color.
The alternate, elliptical to circular leaves are light green in color and 2-5 in. (5-13 cm) long.
Small, inconspicuous, axillary, greenish-white flowers bloom from May to early June. Oriental bittersweet closely resembles American bittersweet (Celastrus scandens). The main difference: Celastrus scandens has flowers and fruits at the ends of branches; Celastrus orbiculatus has flowers in the axils of the leaves.
The small globose fruits are green when young; ripen to yellow; then split to reveal showy, scarlet berries that persist into winter.
Ecological Threat
Celastrus orbiculatus is commonly found in old home sites, fields, and road edges. The fast growing vines can cover, shade and outcompete other vegetation. It can even girdle and kill large trees. Birds and other wildlife eat the fruit, thus distributing the seeds. It hybridizes with Celastrus scandens, potentially leading to loss of genetic identity for the native species. It was introduced from China around 1860 as an ornamental.

Identification, Biology, Control and Management Resources

Nonnative Invasive Plants of Southern Forests - USDA Forest Service
Southeast Exotic Pest Plant Council Invasive Plant Manual - SE-EPPC
Element Stewardship Abstract - The Nature Conservancy
Weeds Gone Wild: Alien Plant Invaders of Natural Areas - Plant Conservation Alliance
Invasive Plant Atlas of New England - University of Connecticut
Weed of the Week - USDA Forest Service
Plant Invaders of Mid-Atlantic Natural Areas - National Park Service and U.S. Fish and Wildlife Service