Ask the Expert: Can you identify this blooming vine?

I saw this vine a few days ago in wooded area next to gravel road.

Desmodium

Vine seems to be at least 4 feet tall, blooms are sparse, blooms late July-early August. Leaves are 3 in cluster. Thanks. Debbie


Plant Expert Reply:
It looks similar to a sweet pea but I don’t think it is. I am investigating
a few possiblities. Is this plant crawling on the ground or more up right.
What state did you find it in – this will help me narrow down the choices.