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Wood sorrel (Oxalis acetosella), illustration

Wood sorrel ( Oxalis acetosella ), illustration

Class : Bedecktsamer (Magnoliopsida)
Nuclear eudicotyledons
Eurosiden I
Order : Sorrel-like
Scientific name
Bercht. & J. Presl

The wood sorrel (Oxalidales) are an order of the bedecktsamer (Magnoliopsida). The taxa contained therein share only a few morphological traits with each other, so the order was mainly delimited by molecular genetic studies. With almost 800 species , the genus wood sorrel ( Oxalis ) is the largest of the very small order with around 1800 species.


Mucous cells are present, the leaves are pinnate unpaired to composed of three (rarely one) leaflets . Styles are present, the scars are dry. Wax flakes are found epicuticularly . The outer epidermis of the inner integument is fibrous with tracheids . The inner layer of the seed coat , the endotesta, is crystalline.


The sorrel-like are within the euro Siden I the sister group of Malpighiales .

The order Oxalidales includes the following families :

The following cladogram breaks down the internal relationship of the order in more detail.












Botanical history

The Oxalidales were first described by August Heintze as early as 1927 , but included among their then twelve families (including the legumes (Fabaceae), the cranesbill family (Geraniaceae) or the flax family (Linaceae)) with the sorrel family (Oxalidaceae) and the Connaraceae only two of the families from today's scope.

The families now counted among the Oxalidales, however, used to belong to completely different orders and sometimes even to different subclasses . In today's scope, they have only been recognized in the course of molecular genetic studies. There were first indications of the common descent as early as 1993. A clade from the Oxalidaceae, Cephalotaceae, Cunoniaceae and the Tremandraceae (now absorbed into the Elaeocarpaceae) was set up. Further investigations confirmed the order and added it to its present size. Despite detailed investigations, however, there are hardly any features that allow a morphological description of the order.

Web links

Commons : Wood sorrel (Oxalidales)  - Collection of images, videos and audio files


Individual evidence

  1. a b Angiosperm Phylogeny Group : An update of the Angiosperm Phylogeny Group classification for the orders and families of flowering plants: APG III. In: Botanical Journal of the Linnean Society. Volume 161, No. 2, 2009, pp. 105-121, DOI: 10.1111 / j.1095-8339.2009.00996.x .
  2. Quoted after the entry on the order on the AP website