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. George Colthup
= Melba x hartmannii ( has 23 hybrid progeny ) registered: 1/12/1986 by Banks, David Sarco. George Colthup '2000' AM/ANOS 2010
Species composition summary:
hartmannii 75.% falcatus 25.%
Detailed composition:
Sarco. George Colthup = Melba x hartmannii = [hartmannii x falcatus] x hartmannii