- Dioscorea polystachya is an invasive herbaceous, twining vine that grows to about 16.4 ft. (5 m). It invades open to shady areas in the Eastern United States.
- The leaves are alternate proximally but can become opposite as they advance up the vine. They are about 8 in. (20.3 cm) long, wide, and heart to fiddle shaped (margins three-lobed), with prominent, parallel veins. The petiole base is not clasping. Leaves are usually more rounded when young or on young plants and fiddle shaped farther along the stem and on older plants. The rounded stems are thin and wiry.
- The staminate plants may produce small, white flowers annually.
- The seeds are winged all around, but the chief means of reproduction are aerial, potato-like tubers (bulbils) located at the leaf axils and underground tubers.
- Ecological Threat
- Dioscorea polystachya can form dense masses of vines that cover and kill native vegetation, including trees, within a variety of moist, disturbed habitats. It was introduced from Asia for ornamental, food, and medicinal purposes and escaped cultivation in the mid-1990s.
- 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
- Weed of the Week - USDA Forest Service
- Plant Invaders of Mid-Atlantic Natural Areas - National Park Service
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EDDMapS Distribution - This map is incomplete and is based only on current site and county level reports made by experts, herbaria, and literature. For more information, visit www.eddmaps.org
State Invasive List - This map identifies those states that list this species on their invasive species list. For more information, visit Invasive.org
Invasive Listing Sources
- Alabama Invasive Plant Council
- Faith Campbell, 1998
- Georgia Exotic Pest Plant Council - Category 2
- Great Lakes Early Detection Network
- Illinois Invasive Plant List
- Jil M. Swearingen, Survey of invasive plants occurring on National Park Service lands, 2000-2007
- Jil Swearingen, personal communication, 2009-2016
- Kentucky Exotic Pest Plant Council - Severe Threat
- Maryland Department of Natural Resources, 1994
- Mid-Atlantic Exotic Pest Plant Council, 2005
- Missouri Department of Conservation,
- Nonnative Invasive Species in Southern Forest and Grassland Ecosystems
- South Carolina Exotic Pest Plant Council - Watch A
- Tennessee Exotic Pest Plant Council
- Virginia Invasive Plant Species List
- WeedUS - Database of Plants Invading Natural Areas in the United States
- Wisconsin's Invasive Species Identification, Classification and Control Rule
Other System LinksPlants: DIOP
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|Scientific Name Reference:||Flora of North America. http://www.efloras.org/|