Dioscorea alata L.
USDA PLANTS Symbol: DIAL2
U.S. Nativity: Exotic
- Dioscorea alata is an herbaceous, twining vine that can grow to lengths exceeding 30 ft. (9.1 m). It invades open to shady areas in the extreme southeastern United States.
- Leaves are opposite, 8 in. (20.3 cm) long and narrowly heart-shaped with long petioles. The stems are square with the corners compressed into wings.
- The vine rarely flowers.
- The chief means of reproduction is by aerial potato-like tubers (bulbils) located at the leaf axils and by underground tubers.
- Ecological Threat
- Dioscorea alata can form dense masses of vines that cover and kill native vegetation including trees. It was introduced from Asia as a possible food source in the early 1800s. In some countries it is presently being cultivated for medicinal uses.
Identification, Biology, Control and Management Resources
Nonnative Invasive Plants of Southern Forests
- USDA Forest Service
Identification and Biology of Non-Native Plants in Florida's Natural Areas
- University of Florida