Thalamiflorae is a historical grouping of
dicotyledons, arranged in the
De Candolle system and in the
Bentham and Hooker system. This group was named and published well before internationally accepted rules for
botanical nomenclature. In these systems, a family was indicated as "ordo", and modern rules of
botanical nomenclature accept that as meaning a family rather than an order.
Article 18.2 Family names have also since been standardized (most family names now end in -
aceae).