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
Peristeranthus hillii a species described 1954 by (Mueller) Hunt P.
Sarco. Elise = Prschs. Cherub 2015 Butler D.F.
Sarcochilus falcatus = Prschs. Olive Grace 1996 Simpson Orchids
Plectorrhiza Olga = Prshz. Surreal 2019 Clarke T.
Link to POWOP for this species (Plants of the World Online Portal- RBG, Kew) Select the POWOP result for distribution, synonyms, bibliography...