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. Bonnie= Tigress x hartmannii ( has 2 hybrid progeny ) registered: 30/10/2007 by Roper N.
Species composition summary:
hartmannii 62.5% spathulatus 25.% fitzgeraldii 12.5%
Sarco. Bonnie = Tigress x hartmannii = [Fitzhart x spathulatus] x hartmannii
Fitzhart = hartmannii x fitzgeraldii