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. Cracker= Fitzhart x Nabiac ( has 2 hybrid progeny ) registered: 24/10/2011 by Roper N.
Species composition summary:
hartmannii 50.% fitzgeraldii 43.8% falcatus 6.3%
Sarco. Cracker = Fitzhart x Nabiac = [hartmannii x fitzgeraldii] x [Melody x Heidi]
Heidi = Fitzhart x hartmannii = [hartmannii x fitzgeraldii] x hartmannii
Melody = Melba x fitzgeraldii = [hartmannii x falcatus] x fitzgeraldii