This name is a synonym of Symphyotrichum concolor var. devestitum (S.F.Blake) Semple.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 15991748-EADB-4E11-8CBE-171993581208) with original publication details: Rhodora 32 145 1930.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:23243-2.
This name was in version 1 of The Plant List, record gcc-12389, and has not been changed.