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The Info List - Commelinids


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In plant taxonomy, COMMELINIDS (originally COMMELINOIDS ) (plural, not capitalised) is a name used by the APG IV system for a clade within the monocots , which in its turn is a clade within the angiosperms . 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 .

CONTENTS

* 1 Description

* 2 Taxonomy

* 2.1 Subdivision

* 3 References * 4 Bibliography * 5 External links

DESCRIPTION

Members of the commelinid clade have cell walls containing UV -fluorescent ferulic acid .

TAXONOMY

The commelinids were first recognized as a formal group in 1967 by Armen Takhtajan , who named them the Commelinidae and assigned them to a subclass of the monocots. However, by the release of his 1980 system of classification, he had merged this subclass into a larger one no longer considered to be a clade.

The commelinids constitute a well-supported clade within the monocots, and this clade has been recognized in all four APG classification systems.

CLADOGRAM 1: THE PHYLOGENETIC COMPOSITION OF THE MONOCOTS

MONOCOTS 131

Acorales

Alismatales

122

Petrosaviales

120

Dioscoreales 115

Pandanales 91

Liliales 121

121

Asparagales 120

commelinids 118

Arecales

Poales

Zingiberales

Commelinales

Lilioid monocots 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). In APG IV (2016) the family Dasypogonaceae is no longer directly placed under commelinids but instead a family of order Arecales .

clade monocots :

* clade commelinids:

* order Arecales (palms) * order Commelinales (spiderwort, water hyacinth) * order Poales (grasses, rushes, bromeliads) * order Zingiberales (gingers, banana)

COMMELINIDS

Arecales

Poales

Zingiberales

Commelinales

The current phylogeny and composition of the commelinids.

REFERENCES

* ^ APG (1998). "An ordinal classification for the families of flowering plants". _ Annals of the Missouri Botanical Garden _. 85 (4): 531–553. JSTOR
JSTOR
2992015 . doi :10.2307/2992015 . * ^ 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 . * ^ Harris Rassmussen, F. (1983). " Monocotyledon evolution. Characters and phylogenetic estimation". _Evol. Biol_. 16: 255–395. * ^ Takhtajan, A. (1967). _Система и филогения цветкорых растений (Systema et Phylogenia Magnoliophytorum)_. Moscow: Nauka. * ^ _A_ _B_ 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 . * ^ _A_ _B_ APG IV 2016 . * ^ "An update of the Angiosperm Phylogeny Group classification for the orders and families of flowering plants: APG III". _Botanical Journal of the Linnean Society