LariAnn, when I resarched it the references to it suggested it was a goeldii cross, but no indication what it was crossed with. It seems the cross was done in the Netherlands. I've seen other named plants from the Netherlands which were just species propagated by tissue culture and sold as cultivars. I wonder whether they've just done that with this one.
Mine's going into the ground (in due course, when I have the time
). Does it grow as a "tree" the same as bipinnatifidum, or does it climb?