Ex-garden dirt, that had had a green bean type crop?

Perhaps a Rhynchosia???

No match with Rhynchosia. The closest leaf match is minima which isn't very close. None have lobed leaves except minima, (slightly).

Strophostyles helvola

^ Trailing Fuzzybean (Strophostyles helvola), thanks!!!

The really interesting thing about this native is that it will actually bear both yellow & pink flowers on the same plant!