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
Den. Issy's Summer = Brolga x Autumn Registration: 2009 by Castle Creek -Klein I.
Barbara Tulloch = Issy's Sunrise 2017 Cannon, David -Castle Creek
Cobber = Crowea Sunset 2018 Cannon, David