Under the International Code of Nomenclature for algae, fungi, and plants (ICN), Rosidae is a botanical name at the rank of subclass. Circumscription of the subclass will vary with the taxonomic system being used; the only requirement being that it includes the family Rosaceae.
Under Phylocode, Rosidae is a clade defined as the most inclusive crown clade containing Rosa cinnamomea, but not Berberidopsis corallina nor Dillenia indica nor Gunnera manicata nor Helianthus annuus nor Saxifraga mertensiana nor Stellaria media nor Viscum album.
A well-known example of Rosidae as governed by the ICN was in the Cronquist system. In the 1981, original, version of that system, the circumscription was as follows.
- subclass Rosidae
The Phylocode definition includes Crossosomatales, Geraniales, Myrtales, Fabidae (Celastrales, Cucurbitales, Fabales, Fagales, Huaceae, Oxalidales, Malpighiales, Rosales and Zygophyllales), Malvidae (Brassicales, Huerteales, Malvales, and Sapindales) as they are defined in the APG III system. This definition was formulated in 2007, and is agnostic on the inclusion or exclusion of Picramniales and Vitales. Since 2007, the phylogenetic positions of Picramniales and Vitales have been clarified. The position of Picramniales as sister to Malvidae sensu stricto requires it to be included among the rosids. Vitales is sister to the clade of all that must be included in the rosids and its inclusion is optional. In APG III, it was included.
There is considerable overlap between the two definitions. Some apparent differences are the result of more broadly drawn orders in the second. Apiales, Cornales, Proteales and Santalales, and parts of Rafflesiales (sensu Cronquist) 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 III system, which eschewed formal botanical names between the ranks of class and order, the term "rosids" is used to define an informal clade corresponding to Rosidae as defined in the Phylocode.
- sensu L. 1753 non L. 1759
- Cantino, Philip D.; James A. Doyle; Sean W. Graham; Walter S. Judd; Richard G. Olmstead; Douglas E. Soltis; Pamela S. Soltis; Michael J. Donoghue (2007). "Towards a phylogenetic nomenclature of Tracheophyta" (PDF). Taxon. 56 (3): E1–E44. doi:10.1002/tax.563001. JSTOR 25065865.
- Arthur John Cronquist. 1981. An Integrated System of Classification of Flowering Plants. Columbia University Press: New York, NY, USA.
- Angiosperm Phylogeny Group (2009). "An update of the Angiosperm Phylogeny Group classification for the orders and families of flowering plants: APG III". Botanical Journal of the Linnean Society. 161 (2): 105–121. doi:10.1111/j.1095-8339.2009.00996.x. Archived from the original on 25 May 2017.
- Philip D. Cantino, James A. Doyle, Sean W. Graham, Walter S. Judd, Richard G. Olmstead, Douglas E. Soltis, Pamela S. Soltis, and Michael J. Donoghue. 2007. Electronic Supplement: pages E1-E44. To: Cantino et alii. 2007. "Towards a phylogenetic nomenclature of Tracheophyta". Taxon 56(3):822-846. (see External links below).
- Hengchang Wang, Michael J. Moore, Pamela S. Soltis, Charles D. Bell, Samuel F. Brockington, Roolse Alexandre, Charles C. Davis, Maribeth Latvis, Steven R. Manchester, and Douglas E. Soltis (10 March 2009). "Rosid radiation and the rapid rise of angiosperm-dominated forests". Proceedings of the National Academy of Sciences. 106 (10): 3853–3858. Bibcode:2009PNAS..106.3853W. doi:10.1073/pnas.0813376106. PMC 2644257. PMID 19223592.CS1 maint: multiple names: authors list (link)