Magnolia × brooklynensis
Magnolia" × "brooklynensis is a hybrid "Magnolia" that is the result of a cross between "Magnolia acuminata" (cucumbertree) and "Magnolia liliiflora" (Mulan magnolia). It was developed in a breeding program at the Brooklyn Botanic Garden beginning in 1953 to create yellow-flowered varieties. A number of cultivars of "Magnolia" ×"brooklynensis" are commercially available, including 'Evamaria', 'Hattie Carthan', and 'Yellow Bird' (the result of a back-cross with 'Evamaria' and "M. acuminata" var. "subcordata"). 'Evamaria' has purplish flowers with touches of orange, yellow or green. 'Hattie Carthan' has yellow flowers with a blush of red-purple veins, and  'Yellow Bird' has deep yellow petals. The Brooklyn Botanic Garden also created the 'Elizabeth' cultivar, which is often lumped in with "M." × "brooklynensis", by crossing "Magnolia acuminata" and "Magnolia denudata". The cream to pale yellow flowered "Magnolia" 'Elizabeth' has gained the Royal Horticultural Society's Award of Garden Merit.