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. Riverdene= hartmannii x hirticalcar ( has 15 hybrid progeny ) registered: 1/01/1976 by Jupp V.&N.
Species composition summary:
hirticalcar 50.% hartmannii 50.%
Sarco. Riverdene = hartmannii x hirticalcar