Cupuliferae is a botanical name:[1] in this case it is a descriptive botanical name: under the ICBN it may only be applied to a taxon at a rank above that of family.
In the de Candolle system it referred to what is now the family Fagaceae, while in the Bentham & Hooker system it referred to a somewhat larger family, that in addition included what is now the family Betulaceae.
Note that in both these works a family is indicated as "ordo".
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