Wildflowers: On the edge of a forest beside a lake (as earlier)

The title says it

Looks like some kind of pea vine to me

 

Vicia sp., V.americana looks similar.

 

After looking at them on Google I agree, but there seem two distinctively different ones, and the are of occurrence given does not include Texas.

They look very much like this one
But not clustered like this one

I ran across what looks like the same thing to me yesterday, in a different year and an entirely different location.