A name of a species or subdivision of a genus may be legitimate even if its epithet was originally placed under an illegitimate generic name (see also Art. 22.5).
Agathophyllum neesianum Blume (1851) is legitimate even though Agathophyllum Juss. (1789) is illegitimate, being a superfluous replacement name for Ravensara Sonn. (1782). Because Meisner (1864) cited A. neesianum as a synonym of his new Mespilodaphne mauritiana,M. mauritiana Meisn. is illegitimate under Art. 52.
Calycothrix sect. Brachychaetae Nied. (in Engler & Prantl, Nat. Pflanzenfam. 3(7): 100. 1892) is legitimate even though it was published under Calycothrix Meisn. (1838), a superfluous replacement name for Calytrix Labill. (1806).
An infraspecific name may be legitimate even if its final epithet was originally placed under an illegitimate species name (see also Art. 27.2).
Agropyron japonicum var. hackelianum Honda (in Bot. Mag. (Tokyo) 41: 385. 1927) is legitimate even though it was published under the illegitimate A. japonicum Honda (1927), a later homonym of A. japonicum (Miq.) P. Candargy (1901) (see also Art. 27 Ex. 1).
The names of species and of subdivisions of genera assigned to genera the names of which are conserved or sanctioned later homonyms, and that had earlier been assigned to the genera under the rejected homonyms, are legitimate under the conserved or sanctioned names without change of authorship or date if there is no other obstacle under the rules.
Alpinia languas J. F. Gmel. (1791) and A. galanga (L.) Willd. (1797) are so accepted although Alpinia L. (1753), the name of the genus to which they were assigned by their authors, is rejected and the genus in which they are now placed is named Alpinia Roxb. (1810), nom. cons.