To confirm the registration of an Australian native hybrid & view its composition/progeny: (Database as at 1st April 2018 RHS registrations)
For non-Australian Dendrobium hybrids use the Dendrobium Hybrids checklist here
Sarco. Melba= hartmannii x falcatus ( has 28 hybrid progeny ) registered: 1/12/1966 by Butler I.A.
Sarco. Melba ‘Mollie Rose’ AM/AOC 2011
Species composition summary:
Sarco. Melba = hartmannii x falcatus