Wikipedia:WikiProject Plants/Description in year categories
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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.
Choosing a category
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.
- Carex vulpinoidea Michx. was described in 1803, so the article is placed in Category:Plants described in 1803.
- Castilleja attenuata (A.Gray) T.I.Chuang & Heckard. The author citations after this plant name mean that Asa Gray was the first person to describe this species (in 1857 as Orthocarpus attenuatus) and in 1991, T.I.Chuang & Heckard reassessed the species and altered the name (in this case, they moved it to another genus and altered the species gender to match). As a general rule, the species article should be categorized by the earliest formal, valid description, so this species is placed in Category:Plants described in 1857.
- Muscari racemosum Mill. was first described by Linnaeus in 1753 as Hyacinthus muscari. When it was transferred to Miller's genus Muscari in 1768, the specific epithet had to change (as the ICN does not allow the same genus name and specific epithet), so there is no "(L.)" in the authority. Nevertheless the earliest formal description was by Linnaeus, so the article is placed in Category:Plants described in 1753.
- Utricularia quinquedentata F.Muell. ex P.Taylor. The "ex" in this author abbreviation indicates that F.Muell. (Ferdinand von Mueller) did not fully or validly publish the species. In this case, he only suggested a name without a description in 1893. Peter Taylor found the reference and published a description based on Mueller's specimens in 1986, so this article is placed in Category:Plants described in 1986.
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.
There is a slight quirk in the categories. For example, the first decade in the 20th century is described as "the 1900s", and covers the years 1900, 1901, ... to 1909. However, strictly speaking, the 20th century begins in 1901, not 1900. Thus categories such as Category:Plants described in the 20th century actually mean "Plants described in 1900 to 1999".
Discussion in the text
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,
- A b was first named and described in 1888 by Joe Bloggs.1
- A b was first named and described in 1888 by Joe Bloggs, and transferred to the genus C as C d (since C b already existed) by Jane Smith in 1905.2
This ensures that the category "Plants described in 1888" is supported in the text.