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. Fitzhart= hartmannii x fitzgeraldii ( has 66 hybrid progeny ) registered: 1/12/1963 by Butler I.A.
Sarco. Fitzhart ‘Carolyn’ AM/AOC 1994
Species composition summary:
Sarco. Fitzhart = hartmannii x fitzgeraldii