To confirm the registration of an Australian native hybrid & view its composition/progeny: (Database as at 1st January 2020 RHS registrations)
For non-Australian Dendrobium hybrids use the Dendrobium Hybrids checklist here
Sarco. Nabiac= Melody x Heidi ( has 5 hybrid progeny ) registered: 2/07/1997 by Gregory B.
Species composition summary:
Sarco. Nabiac = Melody x Heidi = [Melba x fitzgeraldii] x [Fitzhart x hartmannii]
Fitzhart = hartmannii x fitzgeraldii
Melba = hartmannii x falcatus