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. Heidi
= Fitzhart x hartmannii ( has 57 hybrid progeny ) registered: 1/01/1983 by Banks, DavidSpecies composition summary:
hartmannii 75.% fitzgeraldii 25.%
Detailed composition:
Sarco. Heidi = Fitzhart x hartmannii = [hartmannii x fitzgeraldii] x hartmannii