Clematis: ID Needed, 1 by Qwilter

Qwilter wrote:
I bought this plant 2 years ago at Walmart. The tag just said "White Clematis". I thought it would look nice between my Nellie Moser & a deep burgandy I have. This is the 1st year it has bloomed and althought it is white, it is also "fluffy". I've never seen one like this.

This one has a pale lavender colored center. There is another, hiding where I could not get a good shot, that has a light green center.

Any info is appreciated.