La classification phylogénétique APG IV

Le Botanical Journal of the Linnean Society vient de publier (2016) la classification APG IV établie par l'Angiosperms Phylogeny Group.

Le Botanical Journal of the Linnean Society vient de publier (2016) la classification APG IV établie par l’Angiosperms Phylogeny Group.

An update of the Angiosperm Phylogeny Group classification for the orders and families of flowering plants: APG IV
The Angiosperm Phylogeny Group
The Linnean Society of London, Botanical Journal of the Linnean Society, 2016
Article first published online: 24 MAR 2016
DOI: 10.1111/boj.12385

Abstract

Keywords: Apodanthaceae; Aristolochiaceae; Boraginales; Cistaceae; Cynomoriaceae; Dasypogonaceae; Dilleniales; Francoaceae; Gesneriaceae; Icacinales; Metteniusales; Orobanchaceae; Phrymaceae; Phytolaccaceae; Resedaceae; Restionaceae; Sabiaceae; Santalales; Vahliales

An update of the Angiosperm Phylogeny Group (APG) classification of the orders and families of angiosperms is presented. Several new orders are recognized: Boraginales, Dilleniales, Icacinales, Metteniusiales and Vahliales. This brings the total number of orders and families recognized in the APG system to 64 and 416, respectively. We propose two additional informal major clades, superrosids and superasterids, that each comprise the additional orders that are included in the larger clades dominated by the rosids and asterids. Families that made up potentially monofamilial orders, Dasypogonaceae and Sabiaceae, are instead referred to Arecales and Proteales, respectively. Two parasitic families formerly of uncertain positions are now placed: Cynomoriaceae in Saxifragales and Apodanthaceae in Cucurbitales. Although there is evidence that some families recognized in APG III are not monophyletic, we make no changes in Dioscoreales and Santalales relative to APG III and leave some genera in Lamiales unplaced (e.g. Peltanthera). These changes in familial circumscription and recognition have all resulted from new results published since APG III, except for some changes simply due to nomenclatural issues, which include substituting Asphodelaceae for Xanthorrhoeaceae (Asparagales) and Francoaceae for Melianthaceae (Geraniales); however, in Francoaceae we also include Bersamaceae, Ledocarpaceae, Rhynchothecaceae and Vivianiaceae. Other changes to family limits are not drastic or numerous and are mostly focused on some members of the lamiids, especially the former Icacinaceae that have long been problematic with several genera moved to the formerly monogeneric Metteniusaceae, but minor changes in circumscription include Aristolochiaceae (now including Lactoridaceae and Hydnoraceae; Aristolochiales), Maundiaceae (removed from Juncaginaceae; Alismatales), Restionaceae (now re-including Anarthriaceae and Centrolepidaceae; Poales), Buxaceae (now including Haptanthaceae; Buxales), Peraceae (split from Euphorbiaceae; Malpighiales), recognition of Petenaeaceae (Huerteales), Kewaceae, Limeaceae, Macarthuriaceae and Microteaceae (all Caryophyllales), Petiveriaceae split from Phytolaccaceae (Caryophyllales), changes to the generic composition of Ixonanthaceae and Irvingiaceae (with transfer of Allantospermum from the former to the latter; Malpighiales), transfer of Pakaraimaea (formerly Dipterocarpaceae) to Cistaceae (Malvales), transfer of Borthwickia, Forchhammeria, Stixis and Tirania (formerly all Capparaceae) to Resedaceae (Brassicales), Nyssaceae split from Cornaceae (Cornales), Pteleocarpa moved to Gelsemiaceae (Gentianales), changes to the generic composition of Gesneriaceae (Sanango moved from Loganiaceae) and Orobanchaceae (now including Lindenbergiaceae and Rehmanniaceae) and recognition of Mazaceae distinct from Phrymaceae (all Lamiales).

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  1. Voici quelques commentaires concernant cette publication, d’après une première lecture par Michel CHAUVET.

    On avait à peine digéré APG III, voici APG IV !

    Les changements sont indiqués par un astérisque avant le nom, et il y en a très peu. Ils portent surtout sur de petites familles que nous aurons peu l’occasion de rencontrer, et sur des genres qui changent de famille.

    Parmi ces changements, l’un d’eux est nomenclatural : Asphodelaceae au lieu de Xanthorrhoeaceae, ce qui est quand-même plus compréhensible, mais si je comprends bien, ce n’est qu’un nom proposé à la conservation, qui ne peut donc faire consensus pour l’instant.

    Le changement était bien plus important entre APG II et APG III parce que APG II avait une vision plus étroite des familles (« splitter ») que APG III qui est plus englobante (« lumper »).

    Outre Asphodelaceae au lieu de Xanthorrhoeaceae, je note que Boranginaceae est maintenant dans un ordre Boraginales.

    On peut donc tranquillement attendre que les bases de données aient intégré ces changements, et les faire soi-même au cas par cas, sans rien bouleverser.

    Daniel MATHIEU

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