Abstract
Since the work of Kitamura in 1936, Calimeris amplexifolia Siebold & Zucc. has been treated as conspecific with Aster semiamplexicaulis Makino, which is one of the members of the widely distributed, eastern Asian Aster ageratoides group. Reexamination of the original material of Siebold and Zuccarini proved that Aster semiamplexicaulis is actually a mixture of three other species, Aster ageratoides Turcz. var. ageratoides, A. ovatus (Franch. & Sav.) Mot. Ito & Soejima var. ovatus and Solidago Sp. Based on the protologue and the epithet used by Siebold and Zuccarini, a lectotype specimen chosen has the leaf bases rounded and can be identified as A. ageratoides var. ageratoides. Therefore, it is concluded that C. amplexifolia is not a synonym of A. semiamplexicaulis but of A. ageratoides var. ageratoides.
