Clematis japonica 'Bokonomosho'
The Fourth Supplement to the International Clematis Register and Checklist 2002 notes "As the species, except that the young foliage has splashes of cream and white variegation (though this soon reverts to green). Introduced to commerce in USA in 2010 by Sean Hogan of Cistus Nursery. Is this perhaps the same as japonica 'Gokanosho'?"