Wildflowers: Columnea Species Or...?

What might this be? Not at all sure about Columnea

 

I was getting confused by the vine with alternate leaves on the right side of the photo.
This has opposite leaves and is a vine, is that right. It looks so familiar, but nothing similar is coming up anywhere for me. That calyx looks pretty distinctive, rules out lots of tubular flowers.

 

Thank you. It's a mystery.

 

I didn't spot it on here, but maybe you'll have a bit more time to look through: Observations · iNaturalist

 

Thank you. Will give that a try.