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Genus: Smilax
Green vine with thorny projections. Less than the thickness of a pencil. Could it be a type of Greenbrier Vine?
Rural SW Pennsylvania
Common names include catbriers, greenbriers, prickly-ivys and smilaxes. "Sarsaparilla" (also zarzaparrilla, sarsparilla). This was in Wikipedia also. So you are in the ball park. I know it just as Smilax when I work w/ it at a Preserve I vol at down here in FL.