I've been doing a Google search for Clematis poish spirit and clematis
viticella Polish Spirit.
It is amazing the variety of bloom shapes and colours which are show.
I guess this must apply to others but which is the definitive?

The one I have bought is between these 2.
http://www.roselandhouse.co.uk/cviticella.htm
and
http://www.roselandhouse.co.uk/cpolishspirit.htm
(Charlie Pridham's catalogue) His pictures are excellent.

Pam in Bristol