I was doing some research into Cypripedium hybrids, and I was reading the recent thread here on Paph. concolor var. longipetalum, and got to wondering when is it 'proper' or 'acceptable' to make a hybrid using one variety of a species, then make another hybrid using another variety of the same species, and give them different names? Eg. Cyp. Gisela is parviflorum x macranthos, and Cyp. Aki is parviflorum var. pubescens x macranthos. The RHS recognizes this, however, hybrids made with Phrag. besseae var. flavum are not. I thought the norm was that if you re-make a hybrid using a different variety of one or more species, that the name would still be the same. Or, how about the different varieties of Paph. phillipinense? Could someone explain the 'rules'?