needrain and plantladylin
We can rule out the Clitoria, and the S. helvola has the wrong shape of leaf (too rounded).
The Strophostyles looks close just don't know which one yet.
Yes I did get them locally, and if I remember correctly they were blooming more of a purple color at the time (early spring)... however...they were growing in a boggy area on the property recently used as a retail plant store/nursery so the plants and/or seeds could have tagged along from when the received a shipment but probably only from the southern states.
I'll head over that way to see if I can get some new and improved photos with a ruler or pen to indicate size to post and will keep my eye out for seed pods.