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. Zoe= Cherie Snow x Heidi ( has 25 hybrid progeny ) registered: 2/11/2000 by Roper N.
Species composition summary:
Sarco. Zoe = Cherie Snow x Heidi = [Cherie x hartmannii] x [Fitzhart x hartmannii]
Fitzhart = hartmannii x fitzgeraldii
Cherie = Fitzhart x fitzgeraldii = [hartmannii x fitzgeraldii] x fitzgeraldii