Your vine is evergreen wisteria (Millettia reticulata). It's not reliably hardy this far north, but yours loses leaves in winter and regrows—defying the books.
Enjoy the anomaly. It's a tough, beautiful vine.

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Narrow Evergreen Foundation Plants for Tight Entry Spaces (Zone 7)
Evergreen Wisteria: Fragrant, Non-Invasive Vine for Summer Blooms
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Butterfly Identification Resources for Southeast Gardeners
Evergreen Wisteria: A Vine That Shouldn't Survive Here But Does
Golden Larch vs. Common Larch: Clearing Up the Confusion
Society Garlic: Seed Collection and Deer Resistance
Lanceleaf Greenbriar: Thornless Vine with Edible Shoots
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