|This article may be expanded with text translated from the corresponding article in the Spanish Wikipedia. (December 2009)|
The family has been recognized by many taxonomists. The APG II system (2003; unchanged from the APG system of 1998), recognizes it and places it in the order Ranunculales in the clade eudicots. It treats the family to consist of two species, Circaeaster agrestis and Kingdonia uniflora, but allows the option of segregating the latter species as family Kingdoniaceae. The APG III system of 2009 also recognizes the two species but no longer allows the optional segregation into Kingdoniaceae.
- Angiosperm Phylogeny Group (2009), "An update of the Angiosperm Phylogeny Group classification for the orders and families of flowering plants: APG III", Botanical Journal of the Linnean Society 161 (2): 105–121, doi:10.1111/j.1095-8339.2009.00996.x, retrieved 2010–12–10
- Circaeasteraceae, Kingdoniaceae, in L. Watson and M.J. Dallwitz (1992 onwards). The families of flowering plants.
- NCBI Taxonomy Browser for Circaeasteraceae sensu stricto; for Kingdoniaceae
- links and more links at CSDL, Texas