Don't know but it is lovely.

it looks a lot like one I had from Brushwood which they called Clematis viticella. The pictures on Clematis on the Web are rather different so I don't know if mine is right or not.
roseberri

Roseberri, I think you're right, or it's darn close. The shape of the flower and color is very close to mine. Looking on the web I've seen two different ones claiming to be Viticella, one more a blue shade, the other had reddish tones. Different cameras, different light? Is yours a rampant grower? I cut mine to the ground each year and by July it's up and trying to smother everything in sight :).

Annette

yes, Annette,
mine is young but it has always scrambled to the top of the arbor(9 ft.)it is supposed to get 10 to 16 feet. It seems to be a tough little cookie! Does yours bloom all summer ? Mine has stopped now and I trimmed it back hoping for rebloom but not sure it will do this. Cant remember about it's habits last year.
roseberri

roseberri, mine definitely covers a large area easily 14-16 feet. I've had for a good number of years, still full of flower but seedpods also. it wanders through 2 roses, a rambler and a D.A. climbing rose. It also reaches out and rambles through my raspberry bed LOL.

Annette