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. Zillie= Lois x Heidi registered: 8/10/1990 by Roper N.
Species composition summary:
hartmannii 62.5% ceciliae 25.% fitzgeraldii 12.5%
Sarco. Zillie = Lois x Heidi = [ceciliae x hartmannii] x [Fitzhart x hartmannii]
Fitzhart = hartmannii x fitzgeraldii