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This name is given to the Magnolia acuminata x M. liliiflora cross (described in the entry for Magnolia acuminata hybrids), originally carried out at the Brooklyn Botanic Garden, but also by Professor Joe McDaniel and Dr. August Kehr.
M. x brooklynensis has been crossed back with M. acuminata as well as other hybrids.
Professor Joe McDaniel recreated the M. x brooklynensis hybrid cross using M. acuminata ‘Klassen’, a large flowered tree with M.liliiflora ‘O’Neill’, a compact growing form with very dark purple flowers. This flowered in 1972, with slightly larger and darker flowers than ‘Eva Maria’.