Treoniaceae

Treoniaceae is a botanical name that has appeared in a limited number of classifications as a proposed family of flowering plants. In contemporary, widely used classifications the name is not recognized as a distinct, valid family. Its status is unsettled, and in many sources the name is treated as a synonym for other groups or as a tentative circumscription that lacks stable acceptance. Because of the lack of a consistent definition, Treoniaceae has not been the basis for detailed descriptions, diagnostic features, or a formal list of included genera in major floras.

Taxonomic history and status: The designation Treoniaceae has circulated in historical and secondary literature, but there is no uniform agreement about its circumscription or rank. Modern reference works and major classification systems typically do not recognize it as a separate family, and when it appears, it is often treated as representing a set of genera that have been reassigned to other families. As a result, there is no consensus on the type genus, defining characters, or the full composition of the group.

Phylogeny: Because Treoniaceae lacks a stable, widely accepted circumscription, it has not contributed to a clear phylogenetic placement within angiosperms in current systems. When researchers discuss its possible relationships, they generally do so in the context of historical classifications or as notes on taxonomic ambiguity rather than as a resolved clade.

Distribution and habitat: No reliable, consensus-based distribution data exist for Treoniaceae as a recognized group, since its recognition as a distinct family is not maintained in modern classifications.