williamsii

williamsii is a Latinized species epithet used in the scientific names of many organisms to honor individuals with the surname Williams. As a genitive form, williamsii can be read as 'of Williams,' indicating an eponymic tribute. There is no single species associated with this epithet; instead, it appears in numerous, independent binomials across taxa.

In nomenclature, the form of the epithet follows rules set by the relevant code. In botanical names, the masculine patronym is commonly rendered with the suffix -ii, while -iae is used for female honorees. In zoological names and related groups, similar patterns apply, with -i or -ii frequently used for men and -ae for women. The exact suffix depends on the code and the gender of the person honored.

The epithet is independent of taxonomy. Changes in genus or reclassification do not change the epithet's attribution; the epithet remains with the species epithet unless the name is invalid or replaced. Because Williams is a common surname, williamsii appears in plants, animals, fungi, and other groups, reflecting the widespread practice of commemorating scientists, collectors, patrons, and local figures.

See also: eponym, binomial nomenclature, International Code of Zoological Nomenclature, International Code of Nomenclature for algae, fungi, and plants.