The Fagales are an order of flowering plants, including some of the best known trees. They belong among the rosid group of dicotyledons. Families typically included here are listed at right, though the Kew checklist (see external link below) only includes the first four families listed.
In the older Cronquist system, these plants were split into three different orders, placed among the Hamamelidae. The Casuarinales comprised the single family Casuarinaceae, the Juglandales comprised the Juglandaceae and Rhoipteleaceae, and the Myricales comprised the remaining forms (plus Belanops). The change is due to studies suggesting that the Myricales, so defined, are paraphyletic to the other two groups.
In the older Cronquist system, these plants were split into three different orders, placed among the Hamamelidae.
The Casuarinales comprised the single family Casuarinaceae, the Juglandales comprised the Juglandaceae and Rhoipteleaceae, and the Myricales comprised the remaining forms (plus Belanops).
The change is due to studies suggesting that the Myricales, so defined, are paraphyletic to the other two groups.
Myricaceae, family Myricaceae, wax-myrtle family — constituting the orderMyricales
Leitneriaceae, family Leitneriaceae, corkwood family — coextensive with the genus Leitneria; commonly isolated in a distinct order
Dicotyledones, class Dicotyledones, Dicotyledonae, class Dicotyledonae, Magnoliopsida, class Magnoliopsida — comprising seed plants that produce an embryo with paired cotyledons and net-veined leaves; divided into six (not always well distinguished) subclasses (or superorders): Magnoliidae and Hamamelidae (considered primitive); Caryophyllidae (an early and distinctive offshoot); and three more or less advanced groups: Dilleniidae; Rosidae; Asteridae
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