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Rosids
Euphorbia heterophylla
Scientific classification
Kingdom: Plantae
(unranked): Angiospermae
Class: Eudicots
(unranked): Rosids
Orders

See text

The rosids are a large group of flowering plants, containing about 70,000 species,[1] more than a quarter of all angiosperms.[2] It is divided into 16 to 20 orders, depending upon circumscription and classification. These orders, in turn, together comprise about 140 families.[3] The rosids and the asterids are by far the largest groups in the eudicots.

Fossil rosids are known from the Cretaceous period. Molecular clock estimates indicate that the rosids originated in the Aptian or Albian stages of the Cretaceous, between 125 and 99.6 million years ago.[4][5]

Contents

The name

The name "rosids" is based upon the name "Rosidae", which had usually been understood to be a subclass. In 1967, Armen Takhtajan showed that the correct basis for the name "Rosidae" is a description of a group of plants published in 1830 by Friedrich Gottlieb Bartling.[6] This group was later renamed "Rosidae" and has been variously delimited by different authors. The name "rosids" is informal, and not assumed to have any particular taxonomic rank like the names authorized by the ICBN. The rosids are a monophyletic group based upon clades found by molecular phylogenetic analysis.

Three different definitions of the rosids are currently in use. Some authors include the orders Saxifragales and Vitales in the rosids.[7] Others exclude both of these orders.[8] The circumscription used in this article is that of the APG II classification, which includes Vitales, but excludes Saxifragales.

Relationships

The rosids and Saxifragales form a monophyletic group.[1][8] This is one of 6 groups that compose the Pentapetalae (Core eudicots minus Gunnerales),[9] the others being Berberidopsidales, Caryophyllales, Dilleniales, Santalales, and the asterids. Almost nothing is known about the relationships between these groups.

Classification

The rosids consist of two groups: the order Vitales and the eurosids (true rosids). The eurosids, in turn are divided into seven groups: Fabidae, Geraniales, Myrtales, Crossosomatales, Picramniales,[8] Malvidae,[9] and the unplaced family Apodanthaceae.[10] The Fabidae are often called the fabids, or eurosids I. Likewise, the Malvidae are often called the malvids, or eurosids II.

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Orders

The rosids consist of 17 orders and 2 families that are placed incertae sedis (not in any order). In addition to Vitales, Geraniales, Myrtales, Crossosomatales, and Picramniales, there are 8 orders in Fabidae and 4 orders in Malvidae. In 2009, Hengchang Wang and co-authors proposed that Malvidae be expanded to include Geraniales, Myrtales, Crossosomatales, and Picramniales. This larger circumscription of Malvidae received strong statistical support (100% bootstrap percentage) in their analysis. Some of the orders have only recently been recognized.[8] These are Vitales,[11] Zygophyllales,[12] Crossosomatales,[13] Picramniales,[14] and Huerteales.[15]

Unplaced families

The families Apodanthaceae and Huaceae are included in the rosids, but not placed in any of its orders.

Apodanthaceae is an enigmatic family of achlorophyllous parasites. They have been provisionally placed in Cucurbitales by some,[8] but their affinities remain obscure.[10] The chloroplast genes that have been used to infer plant phylogeny do not provide much phylogenetic information for plants that lack chlorophyll, because in this case, these genes are nonfunctional pseudogenes.

The family Huaceae is a member of the COM (Celastrales, Oxalidales, Malpighiales) clade of Fabidae. The question about Huaceae is whether it should be included in one of the COM orders or in an order by itself as a 4th member of the COM clade. Two studies have indicated that it should be placed in Oxalidales,[16][17] while one has indicated that it should not.[1]

Phylogeny

The phylogeny shown below is adapted from Wang and co-authors (2009),[1] with order names from the Angiosperm Phylogeny Website.[8] Branches with less than 50% bootstrap support are collapsed. Other branches have 100% bootstrap support except where shown.


Vitales


eurosids 
Fabidae 

Zygophyllales



COM clade 

Huaceae



Celastrales



Oxalidales



Malpighiales



nitrogen-fixing clade 

Fabales




Rosales




Fagales



Cucurbitales







Malvidae sensu lato 
65% 

Geraniales



Myrtales





Crossosomatales




Picramniales


Malvidae sensu stricto 

Sapindales




Huerteales




Brassicales



Malvales









The nitrogen-fixing clade contains a high number of actinorhizal plants (which have root nodules containing nitrogen fixing bacteria, helping the plant grow in poor soils). Not all plants in this clade are actinorhizal, however.

References

  1. ^ a b c d 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 (10Mar2009), "Rosid radiation and the rapid rise of angiosperm-dominated forests", Proceedings of the National Academy of Sciences 106 (10): 3853–3858, doi:10.1073/pnas.0813376106, PMID 19223592, http://www.pnas.org/content/106/10/3853.abstract?etoc  
  2. ^ Robert W. Scotland and Alexandra H. Wortley (2003), "How many species of seed plants are there?", Taxon 52 (1): 101–104, doi:10.2307/3647306  
  3. ^ Douglas E. Soltis, Pamela S. Soltis, Peter K. Endress, and Mark W. Chase (2005), Phylogeny and Evolution of the Angiosperms, Sunderland, MA, USA: Sinauer, ISBN 978-0878938179  
  4. ^ Davies, T.J., Barraclough, T.G., Chase, M.W., Soltis, P.S., Soltis, D.E., and Savolainen, V. (2004), "Darwin's abominable mystery: Insights from a supertree of the angiosperms", Proceedings of the National Academy of Sciences 101 (7): 1904–1909, doi:10.1073/pnas.0308127100, PMID 14766971, http://www.pnas.org/content/101/7/1904.full.pdf+html  
  5. ^ Susana Magallón and Amanda Castillo (2009), "Angiosperm diversification through time", American Journal of Botany 96 (1): 349–365, doi:10.3732/ajb.0800060  
  6. ^ James L. Reveal (2008 onward), "A Checklist of Family and Suprafamilial Names for Extant Vascular Plants", Home page of James L. Reveal and C. Rose Broome, http://www.plantsystematics.org/reveal/pbio/fam/supgennames.html  
  7. ^ J. Gordon Burleigh, Khidir W. Hilu, and Douglas E. Soltis (2009), File 7, "Inferring phylogenies with incomplete data sets: a 5-gene, 567-taxon analysis of angiosperms", BMC Evolutionary Biology 9: 61, doi:10.1186/1471-2148-9-61, http://www.biomedcentral.com/content/supplementary/1471-2148-9-61-S7.pdf  
  8. ^ a b c d e f Peter F. Stevens (2001 onwards), Angiosperm Phylogeny Website, http://www.mobot.org/MOBOT/Research/APweb/welcome.html  
  9. ^ a b 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), "Towards a phylogenetic nomenclature of Tracheophyta", Taxon 56 (3): 822–846, http://www.phylodiversity.net/donoghue/publications/MJD_papers/2007/164_Cantino_Taxon07.pdf  
  10. ^ a b Daniel L. Nickrent, "Apodanthaceae", The Parasitic Plant Connection, http://www.parasiticplants.siu.edu/Apodanthaceae/index.html  
  11. ^ James L. Reveal. (1995). page 72 in Newly required suprageneric names in vascular plants. Phytologia 79(2):68-76
  12. ^ Chalk, L. 1983. Wood structure. Pp. 1-51 [1-2 by C. R. Melcalfe], in Metcalfe, C. R., & Chalk, L., Anatomy of the Dicotyledons, Second Edition. Volume II. Wood Structure and Conclusion of the General Introduction. Clarendon Press, Oxford. ISBN 978-0198545590.
  13. ^ Klaus Kubitzki (2007), "Introduction to Crossosomatales", in Klaus Kubitzki, The Families and Genera of Vascular Plants, vol.IX, Berlin,Heidelberg: Springer-Verlag  
  14. ^ John Hutchinson The Families of Flowering Plants 3rd edition. 1973. Oxford University Press.
  15. ^ Andreas Worberg, Mac H. Alford, Dietmar Quandt, and Thomas Borsch (2009), "Huerteales sister to Brassicales plus Malvales, and newly circumscribed to include Dipentodon, Gerrardina, Huertea, Perrottetia, and Tapiscia", Taxon 58 (2): 468–478  
  16. ^ Douglas E. Soltis, Matthew A. Gitzendanner, and Pamela S. Soltis (2007), "A 567-taxon data set for angiosperms: The challenges posed by Bayesian analyses of large data sets", International Journal of Plant Sciences 168 (2): 137–157, doi:10.1086/509788  
  17. ^ Li-Bing Zhang and Mark P. Simmons (2006), "Phylogeny and delimitation of the Celastrales inferred from nuclear and plastid genes", Systematic Botany 31 (1): 122–137, doi:10.1600/036364406775971778  

Wikispecies

Up to date as of January 23, 2010

From Wikispecies

Euphorbia heterophylla

Taxonavigation

Classification System: APG II (down to family level)

Main Page
Cladus: Eukaryota
Regnum: Plantae
Cladus: Angiospermae
Cladus: Eudicots
Cladus: core eudicots
Cladus: Rosids
Cladus: Eurosids I - Eurosids II - Unassigned Rosids

Name

Rosids

References

  • Angiosperm Phylogeny Group (2003). An update of the Angiosperm Phylogeny Group classification for the orders and families of flowering plants: APG II. Botanical Journal of the Linnean Society 141: 399–436 pdf file
  • NCBI link: rosids (Following APG classification)
Wikimedia Commons For more multimedia, look at rosids on Wikimedia Commons.

Simple English

Rosids
File:Euphorbia heterophylla (Painted Euphorbia) in Hyderabad, AP W IMG
Euphorbia heterophylla
Scientific classification
Kingdom: Plantae
(unranked) Eudicots
(unranked) Rosids
Orders

See text

The rosids are a large clade of flowering plants, containing about 70,000 species, more than a quarter of all angiosperms. It is divided into 16 to 20 orders, depending upon circumscription and classification. These orders, in turn, together comprise about 140 families. The rosids and the asterids are by far the largest clades in the eudicots.

Fossil rosids are known from the Cretaceous period. Molecular clock estimates indicate that the rosids originated in the Aptian or Albian stages of the Cretaceous, between 125 and 99.6 million years ago.


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