This name is a synonym of Aster ageratoides var. sawadanus Kitam..
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 79CCD19A-201E-469D-B722-0012FDEE3F17) with original publication details: 88 1953.
This name was in version 1 of The Plant List, record gcc-72695, and has not been changed.