This name is a synonym of Blumea axillaris (Lam.) DC..
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record EFAA6B46-AB74-4501-A03C-F166142CE569).
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 Erigeron mollis in version 1 of The Plant List.