Clematis: Can you help me determine what kind of clematis this is?, 1 by JeanneTX

JeanneTX wrote:
I have Montana "Spooneri" that is 3 years old and Montana "Mayleen" which I planted last fall..The "Spooneri" is growing well and just started tossing out new vines from the soil...From what I am seeing... the Montana's while more vigorous still need a few years to get really going,,My "Mayleen" had multiple vines in the pot it came in and is just now starting to shoot up the post!! "Spooneri" just started putting out leaves a couple weeks ago while "Mayleen" didn't even appear to have lost it's leaves during winter!!...Here is my "Spooneri" It's the white among My Clematis "Venosa Violacea"..this pic if from last year..will share pics when it's all bloomed out for this year....Jeanne