winged yam

Dioscoreales > Dioscoreaceae > Dioscorea alata L.
Synonym(s): water yam

Winged yam 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 chief means of reproduction is by aerial potato-like tubers (bulbils) located at the leaf axils and by underground tubers. The vine rarely flowers. Winged yam 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


Selected Images from Invasive.org

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Foliage; leaves
Forest & Kim Starr, U.S. Geological Survey, Bugwood.org
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Foliage; leaves
Forest & Kim Starr, U.S. Geological Survey, Bugwood.org
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Foliage; leaves
Forest & Kim Starr, U.S. Geological Survey, Bugwood.org
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Plant(s); in August
Fred Nation, Weeks Bay National Estuarine Research Reserve, Bugwood.org
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Flower(s);
Forest & Kim Starr, U.S. Geological Survey, Bugwood.org
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Flower(s); habit
Forest & Kim Starr, U.S. Geological Survey, Bugwood.org
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Feature(s); Aerial tubers (bubils)
Chris Evans, River to River CWMA, Bugwood.org
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Fruit(s); yamlet
Forest & Kim Starr, U.S. Geological Survey, Bugwood.org
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Infestation;
Chris Evans, River to River CWMA, Bugwood.org
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Plant(s); habit
Forest & Kim Starr, U.S. Geological Survey, Bugwood.org
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Infestation;
Chris Evans, River to River CWMA, Bugwood.org
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Infestation;
Chris Evans, River to River CWMA, Bugwood.org
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Invasive Reference(s):

Check Invasive.org for most current lists.
  • Alabama - IPC List
  • Florida - EPPC list
  • Georgia - EPPC list


External Links


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USDA Forest Service Bugwood University of Georgia