This name is a synonym of Symphyotrichum novi-belgii var. villicaule (A.Gray) Labrecque & Brouillet.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 0BE30194-5C12-4DDD-9081-17201D18ECCF) with original publication details: Rhodora 51 99 1949.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:23583-2.
This name was in version 1 of The Plant List, record gcc-12401, and has not been changed.