Hamamelididae
Encyclopedia
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:
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
does not recognize named taxa above the rank of order but places most of the taxa involved in the rosids
clade, with Hamamelidaceae itself in order Saxifragales
.
Botanical name
A botanical name is a formal scientific name conforming to the International Code of Botanical Nomenclature and, if it concerns a plant cultigen, the additional cultivar and/or Group epithets must conform to the International Code of Nomenclature for Cultivated Plants...
at the rank of subclass. A well-known system that used this name is the Cronquist system
Cronquist system
The Cronquist system is a taxonomic classification system of flowering plants. It was developed by Arthur Cronquist in his texts An Integrated System of Classification of Flowering Plants and The Evolution and Classification of Flowering Plants .Cronquist's system places flowering plants into two...
, although in the disallowed spelling Hamamelidae. In the original 1981 version of this system the circumscription was:
- subclass Hamamelidae
- order Trochodendrales
- order HamamelidalesHamamelidalesHamamelidales is the botanical name of an order of flowering plants. The Cronquist system included the order in subclass Hamamelidae with the circumscription:* order Hamamelidales*: family Hamamelidaceae*: family Cercidiphyllaceae...
- order DaphniphyllalesDaphniphyllalesThe Daphiphllales is a valid botanical name for an order of the Magnoliopsida class. When accepted, it had only one family, Daphniphyllaceae. With regards to phylogenetic classification of the APG III system, this order is no longer accepted, and the Daphniphyllaceae are part of the order...
- order Didymelales
- order EucommialesEucommialesEucommiales is a botanical name for an order of flowering plants. This order was recognised in the Cronquist system, placed in the subclass Hamamelidae [sic], as consisting of a single species: Eucommia ulmoides....
- order UrticalesUrticalesUrticales is a botanical name for what used to be an order of flowering plants. Before molecular phylogenetics became an important part of plant taxonomy, Urticales was recognized in many, perhaps even most, systems of plant classification, with some variations in circumscription...
- order Leitneriales
- order JuglandalesJuglandalesJuglandales is a botanical name for an order of flowering plants. This order was recognised in several systems...
- order Myricales
- order FagalesFagalesThe Fagales are an order of flowering plants, including some of the best known trees. The order name is derived from genus Fagus, Beeches. They belong among the rosid group of dicotyledons...
- 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
Hamamelidaceae
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...
. The APG II system
APG II system
The APG II system of plant classification is the second, now obsolete, version of a modern, mostly molecular-based, system of plant taxonomy that was published in April 2003 by the Angiosperm Phylogeny Group. It was a revision of the first APG system, published in 1998, and was superseded in 2009...
does not recognize named taxa above the rank of order but places most of the taxa involved in the rosids
Rosids
The rosids are members of a large clade of flowering plants, containing about 70,000 species, more than a quarter of all angiosperms. The clade is divided into 16 to 20 orders, depending upon circumscription and classification. These orders, in turn, together comprise about 140 families...
clade, with Hamamelidaceae itself in order Saxifragales
Saxifragales
Saxifragales is an order of flowering plants. Their closest relatives are a large eudicot group known as the rosids by the definition of rosids given in the APG II classification system. Some authors define the rosids more widely, including Saxifragales as their most basal group. Saxifragales is...
.