Here is a list.

http://forums.gardenweb.com/forums/load/clematis/msg101205077324.html?25

Marti, what did the leaves look like?

There is a Clematis armandii 'Appleblossom' :)

For big plants grown on the West Coast try Silver Star Vinery.

Here is a link that might be useful: Silver Star Vinery

Clematis armandii 'Apple Blossom' does not have 4 petals... The description reminds me Clematis montana Mayleen or Elizabeth. Widely available at many online stores.

Thank you very much for the information. I think maybe it was the montana Mayleen variety. It looks very similar. Both of the websites are outstanding. I found many beautiful clematis. I now know where I can find some unusual varities. Thanks again.
Marti

I highly recommend Brushwood Nursery! I placed an order online Sunday, had confirmation the same day, order shipped Monday & received on Thursday. Great looking plants (1 w/i the same day took hold of my chain link fence!), roots filled the pot. Shipping is extraordinaily reasonable for someone like you on the W. coast as well.

Probably my best mail order experience ever, & I order a lot of various plants. I wish everyone would be like them.