Commelinids

In plant taxonomy, commelinids (originally commelinoids[1][2]) (plural, not capitalised) is an APG IV system named clade within the monocots within the angiosperms, distinguished by cell walls containing ferulic acid.[3][4]

Commelinids
Cock's-foot grass (Dactylis glomerata)
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Monocots
Clade: Commelinids
Orders
Diversity
About 1,420 genera

The commelinids are the only clade that the APG has informally named within the monocots. The remaining monocots are a paraphyletic unit. Also known as the commelinid monocots it forms one of three groupings within the monocots, and the final branch, the other two groups being the alismatid monocots and the lilioid monocots.

Description

Members of the commelinid clade have cell walls containing UV-fluorescent ferulic acid.[3][4]

Taxonomy

The commelinids were first recognized as a formal group in 1967 by Armen Takhtajan, who named them the Commelinidae and assigned them as a subclass to Liliopsida (monocots).[5] The name was also used in the 1981 Cronquist system. However, by the release of his 1980 system of classification, Takhtajan had merged this subclass into a larger one, and no longer considered to be a clade.

Takhtajan system

In the Takhtajan system treated this as one of six subclasses within the class Liliopsida (=monocotyledons). It consisted of:

Cronquist system

The Cronquist system treated this as one of four subclasses within the class Liliopsida. It consisted of:

APG system

The APG II system does not use formal botanical names above the rank of order; most of the members were assigned to the clade commelinids in the monocots (its predecessor, the APG system used the clade commelinoids).[6][7] The commelinids now constitute a well-supported clade within the monocots,[8] and this clade has been recognized in all four APG classification systems.

Cladogram 1: The phylogenetic composition of the monocots[9]
monocots 131
 
 
          

Acorales

 
 
 

Alismatales

 
122
          

Petrosaviales

 
 
120
 

Dioscoreales 115

 
 

Pandanales 91

 
 
 
 

Liliales 121

 
121
 

Asparagales 120

 
commelinids 118
          

Arecales

 
 

Poales

 
 
          

Zingiberales

 
 

Commelinales

 
 
 
 
 
 
 
 
 
 
 
Alismatid monocots

Subdivision

The commelinids of APG II (2003) and APG III (2009) contain essentially the same plants as the commelinoids of the earlier APG system (1998).[8] In APG IV (2016) the family Dasypogonaceae is no longer directly placed under commelinids but instead a family of order Arecales.[9]

clade monocots :
  • clade commelinids:
commelinids
 

Arecales

 
 

Poales

 
 
 
 

Zingiberales

 
 

Commelinales

 
 
 
 
The current phylogeny and composition of the commelinids.[10]

References
  1. APG (1998). "An ordinal classification for the families of flowering plants". Annals of the Missouri Botanical Garden. 85 (4): 531–553. doi:10.2307/2992015. JSTOR 2992015.
  2. APG II (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 (4): 399–436. doi:10.1046/j.1095-8339.2003.t01-1-00158.x.
  3. Harris & Hartley 1976.
  4. Dahlgren, R. M. T.; Rassmussen, F. (1983). "Monocotyledon evolution. Characters and phylogenetic estimation". Evolutionary Biology. 16. pp. 255–395. doi:10.1007/978-1-4615-6971-8_7. ISBN 978-1-4615-6973-2.
  5. Takhtajan, A. (1967). Система и филогения цветковых растений (Systema et Phylogenia Magnoliophytorum). Moscow: Nauka.
  6. http://www.mobot.org/mobot/research/apweb/ the official APG website
  7. "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 (4): 399–436. 2003. doi:10.1046/j.1095-8339.2003.t01-1-00158.x.
  8. 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". Taxon. 56 (3): E1–E44. doi:10.2307/25065865. JSTOR 25065865.
  9. APG IV 2016.
  10. "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. 2009. doi:10.1111/j.1095-8339.2009.00996.x.

Bibliography

Media related to Commelinids at Wikimedia Commons

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