The olderCronquist system only included four families (Betulaceae, Corylaceae, Fagaceae, Ticodendraceae; Corylaceae now being included within Betulaceae); this arrangement is followed by, for example, the World Checklist of selected plant families.[2] The other families were split into three different orders, placed among theHamamelidae. The Casuarinales comprised the single family Casuarinaceae, the Juglandales comprised the Juglandaceae and Rhoipteleaceae, and the Myricales comprised the remaining forms (plusBalanops). The change is due to studies suggesting the Myricales, so defined, areparaphyletic to the other two groups.
The oldest member of the order is the flowerSoepadmoa cupulata preserved in the lateTuronian-ConiacianNew Jersey amber, which is amosaic with characteristics characteristic of bothNothofagus and other Fagales, suggesting that the ancestor of all Fagales wasNothofagus-like.[3]
^abcAngiosperm 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,hdl:10654/18083
