Growing near a pond. Can be invasive and cover other desirable plants
Can be used as a groundcover, but not near other plants as it will cover & kill them.
Amphicarpaea bracteata with blossoms climbing another plant.
Hog peanut: A shot of the vines, leaves and developing flower clusters.
I am 95% sure this is the correct species.
EPA photo - in the public domain
The plants in August
The inflorescences (early September)