Check out EDDMapS.org to see where this has been reported.
Spermatophytes (seed plants): Angiosperms (flowering plants): Monocots: Dioscoreales
WEAKLEY'S FLORA (11/30/12):
Dioscorea alata
FAMILY
Dioscoreaceae
SYNONYMOUS WITH
PLANTS NATIONAL DATABASE:
Dioscorea alata
FAMILY
Dioscoreaceae
COMMON NAME:
Water Yam, White Yam, Great Yam, Winged Yam
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Chris Evans, Illinois Wildlife Action Plan, Bugwood.org bug_5126013
Month Unknown
Rough oblong aerial tubers at leaf axils resemble miniature potatoes, per A Field Guide for the Identification of Invasive Plants in Southern Forests.
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Chris Evans, Illinois Wildlife Action Plan, Bugwood.org bug_5126028
Month Unknown
Leaf sides continuously convex (vs. D. polystachya's sides w a concave portion, per Weakley's Flora.
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Chris Evans, Illinois Wildlife Action Plan, Bugwood.org bug_5126029
Month Unknown
Dies back in winter but able to cover small trees in a year, per A Field Guide for the Identification of Invasive Plants in Southern Forests.
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Forest and Kim Starr, Starr Environmental, Bugwood.org bug_5160048
Month Unknown
Stems twining clockwise, climbing up to 20m, broadly winged, 4-angular, per Flora of North America.
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Forest and Kim Starr, Starr Environmental, Bugwood.org bug_5163005
Month Unknown HI
Pistillate inflorescences solitary, 4-8(-20) flowered, 6-35cm, internodes ~1cm, per Flora of North America.
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Forest and Kim Starr, Starr Environmental, Bugwood.org bug_5163009
Month Unknown
Aerial tubers to 4" (10cm) long and 1.2" (3cm) wide, per A Field Guide for the Identification of Invasive Plants in Southern Forests.