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. Jean May
= Jeanne x hartmannii ( has 1 hybrid progeny ) registered: 26/01/2018 by Hockey P.J. -o/uSpecies composition summary:
hartmannii 75.% fitzgeraldii 12.5% weinthalii 12.5%
Detailed composition:
Sarco. Jean May = Jeanne x hartmannii = [Weinhart x Fitzhart] x hartmannii
Fitzhart = hartmannii x fitzgeraldii
Weinhart = hartmannii x weinthalii