Cupuliferae
Encyclopedia
Cupuliferae is a botanical name
Botanical name
A botanical name is a formal scientific name conforming to the International Code of Botanical Nomenclature and, if it concerns a plant cultigen, the additional cultivar and/or Group epithets must conform to the International Code of Nomenclature for Cultivated Plants...

: in this case it is a descriptive botanical name
Descriptive botanical names
Descriptive botanical names are names that are governed by Article 16 of the International Code of Botanical Nomenclature , which rules that a name above the rank of family may be either descriptive or formed from the name of an included family...

: under the ICBN it may only be applied to a taxon at a rank above that of family.

However, this name was only used for a family, and for this it may no longer be used. In the de Candolle system
De Candolle system
An early taxonomic system,the de Candolle system was originally published in :and followed up by the very extensive Prodromus:The system recognises the following groups of vascular plants:* classis I. DICOTYLEDONEÆ...

 it referred to what is now the family Fagaceae, while in the Bentham & Hooker system
Bentham & Hooker system
An early taxonomic system, the Bentham & Hooker system for seed plants was published in :The system recognises the following main groups:*DICOTYLEDONUM POLYPETALARUM*: Series 1. THALAMIFLORÆ*: Series 2. DISCIFLORÆ*: Series 3. CALYCIFLORÆ...

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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