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Under the [[International Code of Botanical Nomenclature]] (ICBN) '''Rosidae''' is a [[botanical name]] at the rank of [[Subclass (biology)|subclass]]. [[wiktionary: circumscription|Circumscription]] of the subclass will vary with the [[wiktionary:taxonomic system|taxonomic system]] being used; the only requirement being that it includes the [[Family (biology) |family]] [[Rosaceae]].
Under [[Phylocode]] '''Rosidae''' is a [[clade]] defined as the most inclusive [[crown clade]] containing ''[[Rosa cinnamomea]]''<ref>''sensu'' L. 1753 ''non'' L. 1759</ref> but not ''[[Berberidopsis corallina]]'' nor ''[[Dillenia indica]]'' nor ''[[Gunnera manicata]]'' nor ''[[Helianthus annuus]]'' nor ''[[Saxifraga mertensiana]]'' nor ''[[Stellaria media]]'' nor ''[[Viscum album]]''. <ref name="Cantino">{{ cite journal | last= Cantino | first= Philip D. | coauthors= James A. Doyle, Sean W. Graham, Walter S. Judd, Richard G. Olmstead, Douglas E. Soltis, Pamela S. Soltis, & Michael J. Donoghue | year=2007 | title= Towards a phylogenetic nomenclature of ''Tracheophyta'' | journal=Taxon | volume=56 | issue=3 | pages=E1-E44 | url = http://www.ingentaconnect.com/content/iapt/tax/2007/00000056/00000003/art00020}}</ref>
A well-known usage of the former sense is in the [[Cronquist system]]; in the 1981, original, version of that system the circumscription was:
* subclass Rosidae
{|
|- valign=top
|
*: order [[Rosales]]
*: order [[Fabales]]
*: order [[Proteales]]
*: order [[Myrtales]]
*: order [[Rhizophorales]]
*: order [[Cornales]]
|
*: order [[Santalales]]
*: order [[Rafflesiales]]
*: order [[Celastrales]]
*: order [[Euphorbiales]]
*: order [[Rhamnales]]
|
*: order [[Linales]]
*: order [[Polygalales]]
*: order [[Sapindales]]
*: order [[Geraniales]]
*: order [[Apiales]]
|}
The Phylocode definition includes [[Crossosomatales]], [[Geraniales]], [[Myrtales]], [[Fabidae]] ([[Celastrales]], [[Cucurbitales]], [[Fabales]], [[Fagales]], [[Huaceae]], [[Oxalidales]], [[Malpighiales]], [[Rosales]] and [[Zygophyllales]]), [[Malvidae]] ([[Brassicales]], [[Dipentodontaceae]], [[Gerrardinaceae]], [[Malvales]], [[Sapindales]], and [[Tapisciaceae]]), "probably" [[Picramniaceae]], and "possibly" [[Vitaceae]].<ref name="Cantino"/>
There is considerable overlap between two definitions (some apparent differences are the result of the use of more broadly drawn orders in the second), but Apiales, Cornales, Proteales and Santales and parts of Rafflesiales are excluded from the second, and many groups from Cronquist's [[Hamamelidae]] and [[Dillenidae]] are included.
In both senses the term '''rosid''' applies, as an adjective and noun, to members of the group. In the [[APG system|APG]] and [[APG II system|APG II]] systems, which eschewed formal formal [[botanical name]]s between the ranks of [[class (biology)|class]] and [[order (biology) |order]] the term '''rosids''' is used to define an informal clade corresponding to the PhyloCode (Cantino ''et al'') sense.
==References==
{{reflist}}
==External links==
*''Rosidae'' at the [http://www.csdl.tamu.edu/FLORA/tfplab/rosidae.htm TAMU Lab]
*http://en.wikipedia.org/wiki/Rosidae
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