| Interpreting IPNI listings can be tricky, especially when it comes to tropical plant groups. They are really nothing more than a guide to the original place of publication of a botanical name and give few clues to its current classification. If you look carefully at the Stephanotis names in IPNI you may notice that, with 2 exceptions, they were all published more than 80 years ago, and nearly all are based on tropical Asian plants. A lot can change in botanical classification in that time. Unfortunately there are few up-to-date accounts of tropical Asclepiadaceae (the family Stephanotis belongs to). One that is actually available online is the Flora of China treatment (see link below). If you search through that you will find no treatment of the genus Stephanotis, but you will find several Stephanotis names as synonyms under the genera Jasminanthus and Marsdenia. There is also a note under Jasminanthes that it "was formerly included in Stephanotis, but the letter is endemic to Madagascar." But there is another shock in store! If you look up Stepnanotis in Mabberley's 'The Plant Book', a more or less current index of all plant genera, you will find it is not recognised in its own right but is referred to the genus Marsdenia. Going to the entry for Marsdenia in Mabberley you will find the details -- "(incl. Stephanotis) c. 100 trop & warm. Usu. twining shrubs. Cult. orn. esp. M. floribunda (Brongn.) Schltr (Stephanotis f., stepanotis, Madagascar jasmine, floradora, Madag.) - . . . . . ." I understand that this merging of Stephanotis into the larger genus Marsdenia is now accepted by most botanists who are knowledgable about this group of plants. | 
