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. Graham Hewitt= Ellen x speciosum ( has 29 hybrid progeny ) registered: 1/01/1981 by Upton W.T.
ANOS judging segment: Australian (Section Dendrocoryne )
Species composition summary:
speciosum 50.% kingianum 25.% tetragonum 25.%
Den. Graham Hewitt = Ellen x speciosum = [kingianum x tetragonum] x speciosum