This name is a synonym of Oreostemma alpigenum (Torr. & A.Gray) Greene.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 467205EA-5958-4E28-A7DC-FCC151A90F02).
This name record (from TICA) was not included in version 1 of The Plant List. It is possible the same name was included from a different data source, to check this you can search for Aster alpigenus in version 1 of The Plant List.