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Paired leaves and 5-petaled pinkish to red or yellow flowers help identify this vining non-native invasive plant. Not to be confused with native Matelea (milkvine) species, whose leaves are more heart-shaped.
See information and photos at https://gobotany.nativeplanttrust.org/species/cynanchum/rossicum/
See photo by Flickr user Kari Pihlaviita