Asteridae is a botanical name at the rank of subclass. A botanical name is a formal scientific name conforming to the International Code of Botanical Nomenclature (ICBN and if the plant is a Cultigen, the A class is the Taxonomic rank in the Biological classification of organisms in Biology below phylum and above order. Circumscription of the subclass has varied with the taxonomic system being used but by definition always includes the family Asteraceae (Compositae). The family Asteraceae or Compositae (known as the aster, daisy, or sunflower family) is the largest family of Flowering One of the better-known and more influential systems that formally recognized subclass Asteridae was the Cronquist system devised by botanist Arthur Cronquist, which included the orders:
- Gentianales
- Solanales
- Lamiales
- Callitrichales
- Plantaginales
- Scrophulariales
- Campanulales
- Rubiales
- Dipsacales
- Calycerales
- Asterales
Most of the above orders as defined by Cronquist have been dramatically redefined on the basis of recent molecular systematic studies. A system of plant taxonomy, the Cronquist system is a scheme for the classification of flowering plants (or Angiosperms) Arthur John Cronquist (1919&ndash1992 was a North American botanist and a specialist on Compositae. The family Campanulaceae (also bellflower family) of the order Asterales, contains about 70 genera and 2000 Species Gentianales are an order of Flowering plants included within the Asterid group of Dicotyledons The circumscription of Gentiales in the Cronquist The Solanales are an order of Flowering plants included in the asterid group of Dicotyledons Some older sources used the name Polemoniales The order Lamiales is a Taxon in the asterid group of dicotyledonous Flowering plants. Callitrichales Dumort (1829 is an order of Flowering plants As circumscribed by American botanist Arthur Cronquist in the Cronquist system (1981 The Plantaginaceae Juss or plantain family, is a family of Flowering plants in the order Lamiales. The order Lamiales is a Taxon in the asterid group of dicotyledonous Flowering plants. Campanulales are an order of the subclass Asteridae in the class Magnoliopsida Flowering plants As circumscribed in the Cronquist system For the Spanish town see Rubiales Spain The Rubiales are an order of Flowering plants in the Cronquist system The Dipsacales are an order of Flowering plants included within the Asterid group of Dicotyledons Under the Cronquist system The Calycerales are an order of Flowering plants which include the Acicarpha and the Calycera. The Asterales are an order of Dicotyledonous Flowering plants which include the composite family Asteraceae ( Sunflowers daisies
To a large extent Cronquist's subclass Asteridae corresponds with the older concepts of Sympetalae and Tubiflorae, groups that were defined by having their petals united into a tube. However, these older classifications contained some sympetalous families, such as Cucurbitaceae, that are now known not to be closely related. Cucurbitaceae is a Plant family commonly known as Melons, gourds or cucurbits and includes crops like Cucumbers Cronquist's concept also corresponds closely with the APG II group of euasterids but the APG does not formally recognize a group called "Asteridae" (or any other group above the rank of order). In the APG II system (2003 for the classification of Flowering plants, the name asterids refers to a Clade (a Monophyletic group
Recent phylogenetic studies have suggested that several families, including three major orders not included in Asteridae by Cronquist, Ericales, Cornales, and Apiales, also belong to the asterid group. The Ericales are a large and diverse order of Dicotyledons including for example Tea, Persimmon, Blueberry, Brazil nut, and Cornales is an order of Flowering plants basal among the Asterids, which are part of the core Eudicots. The circumscription of subclass Asteridae, as well as the circumscriptions of the orders contained within it, is currently in a state of flux; many systematic botanists refer to these as clades (asterids, euasterids, etc. In the APG II system (2003 for the classification of Flowering plants, the name asterids refers to a Clade (a Monophyletic group In the APG II system (2003 for the classification of Flowering plants, the name asterids refers to a Clade (a Monophyletic group , rather than use formal names such as subclass Asteridae.
External links
- Asteridae (Cronquist system)
- Asterids
- Phylogeny and the evolution of flower symmetry in the Asteridae
- The Phylogeny of the Asteridae sensu lato Based on Chloroplast ndhF Gene Sequences (link to abstract)
- Phylogeny of the Asteridae s. str. based on rbcL sequences, with particular reference to the Dipsacales (link to abstract)
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