Ranunculidae
Encyclopedia
Ranunculidae is a subclass
Class (biology)
In biological classification, class is* a taxonomic rank. Other well-known ranks are life, domain, kingdom, phylum, order, family, genus, and species, with class fitting between phylum and order...

 of plants used in some taxonomic systems and not others. By necessity it includes the order Ranunculales
Ranunculales
Ranunculales is an order of flowering plants. Of necessity it contains the family Ranunculaceae, the buttercup family, because the name of the order is based on the name of a genus in that family. Ranunculales belongs to a paraphyletic group known as the basal eudicots...

, but otherwise it differs between taxonomic systems.
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