Hamamelidales is an order of

flowering plant Flowering plants are plants that bear flowers and fruits, and form the clade Angiospermae (). The term angiosperm is derived from the Ancient Greek, Greek words (; 'container, vessel') and (; 'seed'), meaning that the seeds are enclosed with ...

s formerly accepted in a number of

systems of plant taxonomy A system is a group of interacting or interrelated elements that act according to a set of rules to form a unified whole. A system, surrounded and influenced by its environment, is described by its boundaries, structure and purpose and is exp ...

, including the

Cronquist system The Cronquist system is a list of systems of plant taxonomy, taxonomic classification system of angiosperms, flowering plants. It was developed by Arthur Cronquist in a series of monographs and texts, including ''The Evolution and Classification of ...

published in 1968 and 1988. The order is not currently accepted in the

Angiosperm Phylogeny Group III system The APG III system of flowering plant classification is the third version of a modern, mostly Molecular phylogenetics, molecular-based, list of systems of plant taxonomy, system of plant taxonomy being developed by the Angiosperm Phylogeny Group ( ...

of plant taxonomy, the most widely accepted system as molecular systematic studies have suggested that these families are not closely related to each other. The

APG II system The APG II system (Angiosperm Phylogeny Group II system) of plant classification is the second, now obsolete, version of a modern, mostly Molecular phylogenetics, molecular-based, list of systems of plant taxonomy, system of plant taxonomy that ...

(2003) assigns them to several different orders: Hamamelidaceae and Cercidiphyllaceae to

Saxifragales Saxifragales is an order (biology), order of flowering plants in the Superrosids, superrosid clade of the eudicots. It contains 15 Families (biology), families and around 100 genera, with nearly 2,500 species. Well-known and economically import ...

, Eupteleaceae to

Ranunculales Ranunculales is an order of flowering plants. Of necessity it contains the family Ranunculaceae, the buttercup family, because the name of the order is based on the name of a genus in that family. Ranunculales belongs to a paraphyletic group k ...

, Platanaceae to

Proteales Proteales is an order of flowering plants consisting of three (or four) families. The Proteales have been recognized by almost all taxonomists. The representatives of the Proteales can be very different from each other due to their very early d ...

, and Myrothamnaceae to Gunnerales. Additional studies of the

chloroplast A chloroplast () is a type of membrane-bound organelle, organelle known as a plastid that conducts photosynthesis mostly in plant cell, plant and algae, algal cells. Chloroplasts have a high concentration of chlorophyll pigments which captur ...

genome have since confirmed that the families moved into the Saxifragales are closely related. The

(1981) included the order in subclass Hamamelidae with the

circumscription Circumscription may refer to: * Circumscribed circle * Circumscription (logic) *Circumscription (taxonomy) * Circumscription theory, a theory about the origins of the political state in the history of human evolution proposed by the American anthr ...

: * order Hamamelidales *: family

Hamamelidaceae Hamamelidaceae, commonly referred to as the witch-hazel family, is a family of flowering plants in the order Saxifragales. The clade consists of shrubs and small trees positioned within the woody clade of the core Saxifragales. An earlier system ...

, now in order Saxifragales *: family Cercidiphyllaceae, now in order Saxifragales *: family Eupteleaceae, now in order

*: family

Platanaceae Platanaceae, the plane family, is a family (biology), family of flowering plants in the order Proteales. The family consists of only a single extant taxon, extant genus ''Platanus'', with twelve known species. The plants are tall trees, native ...

, now in order

*: family

Myrothamnaceae ''Myrothamnus'' is a genus of flowering plants, consisting of two species of small xerophytic shrubs, in the southern parts of tropical Africa and in Madagascar. ''Myrothamnus'' is recognized as the only genus in the family Myrothamnaceae. Myro ...

, now in order Gunnerales

References

External links

* {{Taxonbar, from=Q2696900 Historically recognized angiosperm orders