Joan's daughter had a large vine on the house in NW Illinois: green 4–5" round/heart-shaped leaves, stems with small sharp but soft/hairy spikes, wraps electric meter, grows 30 ft to chimney. No flowers. Dies back in winter, woody stems. Alternate leaf arrangement.
Smilax rotundifolia (Common Greenbrier). Family Smilacaceae includes sarsaparilla. Many species, variable leaf shapes. Some have tiny spring flowers and fall berries.

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