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
Plrhz. Olga= tridentata x erecta ( has 1 hybrid progeny ) registered: 1/12/2019 by Clarke T. -Finch N.
Species composition summary:
Plrhz. Olga = tridentata x erecta