Clematis 'Jackmanii Superba' -- Maybe
Now that I think about it, I did order a 'Jackmanii Superba' once upon a time. This might be it--or it might not be.
The tag was lost before the Clematis ever bloomed.
Whatever it might be, it has been a good grower here in my Southern California garden.
I sat for an hour last week, watching the flowers tremble and shiver in the breeze. It was most delightful.