WikiProject Plants

Main pageTalkTaxon templateBotanist templateResourcesRequestsNew articlesIndex

The categories associated with individual plant species, such as Category:Plants described in 2009, include species described in that year. The following guidelines or suggestions are meant to keep these categories consistent.

Note: the guidelines here only apply to organisms covered by the ICN. Different guidelines apply to organisms covered by the ICZN.

Choosing a category[edit]

First, note that these categories only apply to articles about species, not those about taxa at other ranks. This is because Category:Plants described in 2009, for example, is a subcategory of Category:Species described in 2009.

Second, "described in year" is meant to indicate that a species was first formally and validly described according to the rules of the International Code of Nomenclature for algae, fungi, and plants (ICN) in that year (thus the earliest possible date is 1753). Use reliable sources to figure out the proper category. If the name has remained unchanged, the International Plant Names Index is a good source. Other databases, such as the World Checklist of Selected Plant Families or The Plant List are often better for tracking name changes back to the earliest formal description. Note that there may have been a change of rank, e.g. what is now accepted as a species may have been first described at an infraspecific rank. If so, the date of that description is used.

Some examples:

Category hierarchy[edit]

For reference, the diagram below shows how an article about a plant species fits into the category hierarchy. Parallel hierarchies exist for animal species, fungal species, etc. Start at Category:Plants by year of formal description to explore the plant categories.

Note that the English Wikipedia defines centuries as per MOS:CENTURY; e.g. the 19th century runs from 1801 to 1900. ("Plants described in DECADE" categories were eliminated by consensus in September 2018.)


Not all plant species articles are categorized by year of description, but nevertheless a cumulative plot may be of interest. The rate of description of plant species that are included here shows no signs of diminishing!

Discussion in the text[edit]

It's not possible to reference, and hence directly justify, the addition of categories to an article. So when a year category is present, it is desirable to explain it, at least briefly, in the Taxonomy section, with a suitable secondary source. For example,

This ensures that the category "Plants described in 1888" is supported in the text.