https://rhododendra.com/rhodos/10032
R. 'Loderi Sir Joseph Hooker' Rhododendron Hybrid parentage | Rhododendra
R. 'Loderi Sir Joseph Hooker': Rhododendron Hybrid. Hybridized by Loder, Sir Edmund. Seed parent is R. fortunei ssp fortunei; pollen parent is R. griffithianum.
sir joseph hookerrhododendronhybridparentagerhododendra
https://kew.iro.bl.uk/entities/publication/d2af14be-8b67-432f-bdb5-320e0ba85559
Sir Joseph Dalton Hooker in the Kew Archive.
joseph dalton hookerin thesirkewarchive