As circumscribed to include the Celtidaceae, a family of 14 genera and about 120 species, trees, shrubs, woody vines, herbs, and herbaceous vines, of cosmopolitan distribution. Zavada & Kim (1996) discuss compelling reasons to recognize the Celtidaceae as a family distinct from the Ulmaceae. The distinctiveness of the Celtidaceae from the Cannabaceae and Moraceae is more questionable; and Yang et al. (2013), Sytsma et al. (2002), and many others conclude that Celtidaceae should be considered a part of Cannabaceae.
Ref: Kubitzki, Rohwer, & Bittrich (1993); Sherman-Broyles, Barker, & Schultz (1997) In Flora of North America Editorial Committee (1997); Small (1997) In Flora of North America Editorial Committee (1997); Sytsma et al. (2002); Todzia In Kubitzki, Rohwer, & Bittrich (1993); Yang et al. (2013); Zavada & Kim (1996). Show full citations.