I think I am in possession of Arum italicum ‘Pictum.’ (And yet another hellebore.) Maybe?

I just happened upon this, and if it is indeed an Arum then I am delighted to find it. I will transplant it, as Niche Gardens suggests, to lie alongside my hostas in the under-construction rain garden. Of course, though, one will not be enough. Add one more plant to the shopping list…