Aster magnus Y. N. Lee & C. S. Kim was collected by Lee and Kim (Lee, 1998) on the coastal cliffs of Jungmun of Saekdal-dong on Jejudo Island. The species is similar to A. rupicola H. Lév. & Vaniot but has a decumbent stem, thicker and larger glabrous leaves, and larger flowers (Lee, 1998). Aster magnus Y. N. Lee & C. S. Kim, a species endemic to Korea, has been widely recognized in taxonomic literature (Lee, 2006; Kim, 2009; Korea National Arboretum, 2016; Chung et al., 2017). However, its name was not validly published by Lee (1998), because, contrary to Art. 40. 2 of International Code of Nomenclature for Algae, Fungi, and Plants (ICN) (Turland et al., 2018), he cited two gathering as type: Y. N. Lee & C. Kim s.n., 26 Mar 1997, 15 Oct 1997 (Jang and Lee, 2022). Lee (1998) provided a Latin and English description for A. magnus. Here, A. magnus is validated by reference to the previously published description by Lee (1998) and by designating the holotype. According to Art. 46.3 of ICN (Turland et al., 2018), this name should be attributed to “Lee and Kim”.

Aster magnus Y. N. Lee & C. S. Kim, sp. nov. (Fig. 1)— TYPE: KOREA. Jeju-do, Seogwipo-si, Saekdal-dong 3101-1, 27 Nov 2015, Chung et al. JY151127-004 (holotype: ANH!, isotype: 4 sheets, ANH!, KH!).

Aster magnus Y. N. Lee & C. S. Kim, Korean J. Pl. Taxon. 28: 31, nom. inval.

Notes: Aster magnus Y. N. Lee & C. S. Kim, a Korean endemic plant, was published as a new species by Lee (1998), with the type specimen designated at the Korea Plant Research Institute, established by Lee in 1986. The institute no longer exists, making it impossible to confirm the location of the type specimen of A. magnus. Nevertheless, since Lee donated approximately 12,400 specimens to the National Institute of Biological Resources (KB) in 2009, there is a possibility that the type specimen of A. magnus is housed there. However, recent verification of the type specimen information housed at the National Institute of Biological Resources (KB) yielded no records (Jang et al., 2020, 2022). Accordingly, there is a possibility that the original materials do not currently exist. Therefore, based on the information discussed above, we designated the holotype and isotypes.

Description: Lee (1998).