Dig deeper at SERNEC, a consortium of southeastern herbaria.
Check out EDDMapS.org to see where this has been reported.
Spermatophytes (seed plants): Angiosperms (flowering plants): Monocots: Dioscoreales
Air Yam, Air Potato
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James H. Miller, USDA Forest Service, Bugwood.org bug_9005052
Aerial tubers to 5" (12cm) long, spherical to ovoid, smooth with dimples, per A Field Guide for the Identification of Invasive Plants in Southern Forests.
USDA APHIS PPQ - Oxford, North Carolina , USDA APHIS PPQ, Bugwood.org bug_1148133
Leaf blade broadly ovate-cordate, glabrous, entire, apex long-acuminate, per Flora of North America.
Karen Brown, University of Florida, Bugwood.org bug_5344015b
Flowers rarely, with fragrant spikes to 4" long hanging from leaf axils, per Invasive Plants, Guide to Identification, Impacts and Control.