Holboellias & Stautonia

I have never been quite so confused as when trying to ascertain whether we had our Holboellias and Stautonia correctly named. When I realised the books not only contradicted each other but themselves I gave up; I think we are correct. All (H. latifolia, H.coriacea and S. hexaphylla) are Z9, vigorous, twining climbers with large waxy, white flowers with an overpowering fragrance. The unisexual flowers may be flushed green or purple or may indeed be purple if they are the other sex, and are borne on either the upper or lower parts of the plant, accordingly. Whatever, sometimes you get two-inch long blue fruits that are edible.