What do you mean that you have not heard of a bush Clematis?
USDA hardiness zone 4 to zone 11
CLAIR Du LUNE
Clair du Lune is an outstanding show-off, I have it in the far east garden where it gets no afternoon sun. This way the flowers stay true to color and do not fade during the day. White with a dusting of lilac, darker stripe running down the center of the petal, and ruffly single flowers at 7" across.
This variety grows 8' to 10'.
What can I say about Haku Ookan, nothing about the color except gorgeous . This is the second blooming this year, it took up residence in a pot on the patio where it has lived for three years. It is a smaller variety growing about 6' to 8'.
The flowers are about 5" wide.