This article is about "form" in botany. For the use in zoology, see Form (zoology).

In botanical nomenclature, a form (forma, plural formae) is one of the "secondary" taxonomic ranks, below that of variety, which in turn is below that of species; it is an infraspecific taxon. If more than three ranks are listed in describing a taxon, the "classification" is being specified, but only three parts make up the "name" of the taxon: a genus name, a specific epithet, and an infraspecific epithet.

En botanique et en mycologie, la forme (du latin forma, souvent abrégé en « fo. » ou « f. ») est une entité ou taxon de rang inférieur à l’espèce et à la variété.

Form, tek bir bireyde görülen, populasyonu temsil etmeyen, kalıtsal veya kalıtsal olmayan varyasyonlar. "f." veya "forma" şeklinde gösterilir.