|winged yam|| USDA PLANTS Symbol: DIAL2
U.S. Nativity: Exotic
Habit: Vines Forbs/Herbs
|Dioscorea alata L.|
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Taxonomic Rank: Liliopsida: Dioscoreales: Dioscoreaceae
|Synonym(s): water yam|
|Native Range: Trop. Asia (GRIN);|
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||View All Images at Invasive.org|
This map is incomplete and is based only on current site and county level reports made by experts and records obtained from USDA Plants Database. For more information, visit www.eddmaps.org
State(s) Where Reported invasive.
Based on state level agency and organization lists of invasive plants from WeedUS database.
|Invasive Listing Sources:|
|Alabama Invasive Plant Council|
|Faith Campbell, 1998|
|Florida Exotic Pest Plant Council|
|Georgia Exotic Pest Plant Council|