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. Humming Bird= Sweetheart x Fitzhart ( has 4 hybrid progeny ) registered: 11/12/2012 by Bird D.W.
Species composition summary:
hartmannii 56.3% fitzgeraldii 43.8%
Sarco. Humming Bird = Sweetheart x Fitzhart = [Fitzhart x Heidi] x [hartmannii x fitzgeraldii]
Heidi = Fitzhart x hartmannii = [hartmannii x fitzgeraldii] x hartmannii
Fitzhart = hartmannii x fitzgeraldii