Hamamelididae is a botanical name at the rank of subclass. A well-known system that used this name is the Cronquist system, although in the disallowed spelling Hamamelidae. In the original 1981 version of this system the circumscription was: A botanical name is a formal name conforming to the ICBN. As with its zoological and bacterial equivalents it may also be called a scientific name. Botanical names may be in one part (genus and above), two parts (species) or three parts (below the rank of species). ... In biology, a subclass is one level below a class. ... The Cronquist system is a scheme for the classification of flowering plants (or angiosperms). ...

• subclass Hamamelidae

  order Trochodendrales

  order Hamamelidales

  order Daphniphyllales

  order Didymelales

  order Eucommiales

  order Urticales

  order Leitneriales

  order Juglandales

  order Myricales

  order Fagales

  order Casuarinales

As is true for any botanical name, circumscription of the subclass will vary with the taxonomic system being used; the only requirement being that it includes the family Hamamelidaceae. The APG II system that was adopted for the wikipedia Tree of Life (as in taxoboxes) does not use formal botanical names above the rank of order: within wikipedia this name is taxonomically undefined. APG II places most of the taxa involved in the rosids. Families Trochodendraceae Tetracentraceae The Trochodendrales are an order of dicotyledon plants, comprising the families Trochodendraceae and Tetracentraceae. ... The Hamemelidales are an order of dicotyledons in the Cronquist system, including the following families: Family Hamamelidaceae (witch-hazel family) Family Cercidiphyllaceae (katsura tree) Family Eupteleaceae Family Platanaceae (plane trees) Family Myrothamnaceae (resurrection bush) These served as the prototype for the subclass Hamamelidae. ... The Urticales are an order of dicotyledons in the Cronquist system of classification for flowering plants, including the following families: Barbeyaceae Cannabaceae (hemp family) Cecropiaceae Moraceae (mulberry family) Physenaceae Ulmaceae (elm family) Urticaceae (nettle family) These range from small herbaceous plants to large trees, blooming from the late spring to... Binomial name Leitneria floridana The Corkwood (Leitneria floridana) is a deciduous dioecious shrub or small tree, found only in the Southeast of the United States (Arkansas, Florida, Georgia, Missouri and Texas). ... Families included in the Kew list: Fagaceae - Beech family   (including Nothofagaceae) Betulaceae - Birch family Corylaceae - Hazel family Ticodendraceae not included in the Kew list: Casuarinaceae - She-oak family Juglandaceae - Walnut family Rhoipteleaceae Myricaceae The Fagales are an order of flowering plants, including some of the best known trees. ... Families included in the Kew list: Fagaceae - Beech family   (including Nothofagaceae) Betulaceae - Birch family Corylaceae - Hazel family Ticodendraceae not included in the Kew list: Casuarinaceae - She-oak family Juglandaceae - Walnut family Rhoipteleaceae Myricaceae The Fagales are an order of flowering plants, including some of the best known trees. ... Families included in the Kew list: Fagaceae - Beech family   (including Nothofagaceae) Betulaceae - Birch family Corylaceae - Hazel family Ticodendraceae not included in the Kew list: Casuarinaceae - She-oak family Juglandaceae - Walnut family Rhoipteleaceae Myricaceae The Fagales are an order of flowering plants, including some of the best known trees. ... Genera See text The Hamamelidaceae is a family of flowering plants in the order Saxifragales, including 27 genera and about 80-90 species, all shrubs and small trees. ... A modern system of plant taxonomy, the APG II system of plant classification was published in 2003 by the Angiosperm Phylogeny Group, APG, in Angiosperm Phylogeny Group (2003). ... In botanical nomenclature, a taxon is usually assigned to a rank in a hierarchy. ... In the APG II system for the classification of the angiosperms the name rosids refers to a clade, meaning a monophyletic group of plants. ...