Tetracentraceae is the botanical name for a family of flowering plants. Such a family has been recognized by many taxonomists. 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 biological classification, family (Latin: familia, plural familiae) is 1) a rank or 2) a taxon in that rank. ... Classes Magnoliopsida - Dicots Liliopsida - Monocots The flowering plants (also angiosperms or Magnoliophyta) are one of the major groups of modern plants, comprising those that produce seeds in specialized reproductive organs called flowers, where the ovulary or carpel is enclosed. ...

The APG II system, of 2003 (unchanged from the APG system, of 1998), does not accept such a family, not as such: it assumes the plants involved to belong to family Trochodendraceae. However, APG and APG II do allow the option of segregating family Tetracentraceae, as an optional segregate. This family is unplaced as to order and left among the basal lineages of the eudicots. 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). ... A modern system of plant taxonomy, the APG system of plant classification was published in 1998 by the Angiosperm Phylogeny Group. ... Binomial name Trochodendron aralioides Siebold & Zucc. ... In the APG-system, the names eudicots or tricolpates are applied to a monophyletic group that includes most of the (former) dicotyledons. ...

This segregation would lead to two families of each one species, of trees: Tetracentraceae with Tetracentron sinense and Trochodendraceae with Trochodendron aralioides. These two species share the feature of secondary xylem without vessels, which is quite rare in angiosperms. As the vesselless wood suggested primitiveness these two species have alway attracted taxonomic attention. Binomial name Tetracentron sinense Oliv. ... Binomial name Trochodendron aralioides Siebold & Zucc. ...

The Cronquist system, of 1981, accepted both families and placed these in the order Trochodendrales, in subclass Hamamelidae [sic], in class Magnoliopsida [=dicotyledons]. A system of plant taxonomy, the Cronquist system is a scheme for the classification of flowering plants (or angiosperms). ... Families Trochodendraceae Tetracentraceae The Trochodendrales are an order of dicotyledon plants, comprising the families Trochodendraceae and Tetracentraceae. ... Orders Trochodendrales Hamamelidales Daphniphyllales Didymelales Eucommiales Urticales Leitneriales Juglandales Myricales Casuarinales Hamamelidae is a subclass of plants in the older Cronquist classification scheme. ... Magnoliopsida is the botanical name for a class: this name is formed by replacing the termination -aceae in the name Magnoliaceae by the termination -opsida (Art 16 of the ICBN). ...

The Dahlgren system made the same choice at the rank of family and order, but placed this order in superorder Rosanae in subclass Magnoliidae [=dicotyledons]. One of the modern systems of plant taxonomy, the Dahlgren system was published by monocot specialist Rolf Dahlgren. ... Orders Magnoliales Laurales Piperales Aristolochiales Illiciales Nymphaeales Ranunculales Papaverales Magnoliidae is a sub-class of the Dicotyledon flowering plants in the Cronquist system. ...

The Engler system, in its update of 1964, placed both families in a rather large order Magnoliales, in subclass Archychlamydeae in class Dicotyledoneae. One of the prime systems of plant taxonomy, the Engler system was devised by Adolf Engler. ... Families Annonaceae Degeneriaceae Eupomatiaceae Himantandraceae Magnoliaceae Myristicaceae The Magnoliales are an order of flowering plants. ... Orders see text Dicotyledons or dicots are flowering plants whose seed contains two embryonic leaves or cotyledons. ...

The Wettstein system, last updated in 1935, united the two species in family Trochodendraceae which was placed in order Polycarpicae (the predecessor of order Magnoliales), in subclass Choripetalae, in class Dicotyledones. A system of plant taxonomy, the Wettstein system recognised the following main groups, according to R. Wettstein (4th edition, 1935). ... Young castor oil plant showing its prominent two embryonic leaves (cotyledons), that differ from the adult leaves An example of a trimerous and non-eudicot flower: Magnolia Dicotyledons or dicots are a group of flowering plants whose seed typically contains two embryonic leaves or cotyledons. ...

External links:

• Tetracentraceae in L. Watson and M.J. Dallwitz (1992 onwards). The families of flowering plants: descriptions, illustrations, identification, information retrieval. Version: 3rd May 2006. http://delta-intkey.com.
• Tetracentraceae in the Flora of China
• NCBI Taxonomy Browser
• links at CSDL