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. Cathy= Snowhart x spathulatus registered: 24/10/2006 by Roper N.
Species composition summary:
spathulatus 50.% hartmannii 40.6% fitzgeraldii 9.4%
Sarco. Cathy = Snowhart x spathulatus = [Cherie Snow x hartmannii] x spathulatus
Cherie Snow = Cherie x hartmannii = [Fitzhart x fitzgeraldii] x hartmannii
Fitzhart = hartmannii x fitzgeraldii