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The family is recognised by most taxonomists, and is sometimes known as the box family. However, its placement and circumscription has varied; some taxonomists treat Styloceras in its own family Stylocerataceae, and others have included Simmondsia (usually placed in its own family Simmondsiaceae) in Buxaceae.
The APG II system of 2003 recognises the family, but in a new circumscription in that it includes the genus Didymeles (two species of evergreen trees from Madagascar). However, APG II does allow the option of segregating this genus as family Didymelaceae, as an optional segregate. This represents a slight change from the APG system of 1998, which firmly recognised both families as separate. In both APG and APG II, the family Buxaceae is unplaced as to order and left among the basal lineages of the eudicots. The AP website suggests instating the order Buxales for this family and the family Didymelaceae.
Balthazar, M. von, Peter K. Endress, P. K., and Qiu, Y.-L. 2000. Phylogenetic relationships in Buxaceae based on nuclear internal transcribed spacers and plastid ndhF sequences. Int. J. Plant Sci. 161(5): 785–792 (available online).