Class odd is an understanding of the syntaxology, part of vegetation science. It is a property of a plant species in a particular vegetation. The term is used to distinguish incomplete developed plant communities.
A class-strange species is a type of cat that does not belong in the class (highest syntaxonomic rank) to which the rest of the plant community belongs. The conscious species is thus never found in the original undisturbed plant community and has been supplied from outside.
If there are no levels of association in the particular plant community, and there are dominant class-strange types of cats, one is talking about a derivative community. If, on the other hand, there are only class-specific kens, then one is called community community.
Typical examples of class-strange kens are the many exotic species that dominate indigenous plant communities and expel native carnivores, as American birdcatchers have become the dominant species in many oak forests on low-fat soil. Also see
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