This name is a synonym of Symphyotrichum drummondii var. texanum (E.S.Burgess) G.L.Nesom.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 6D21817C-44F0-4347-8FCA-79318FC405C9) with original publication details: Phytologia 63(2): 131 1987.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:272823-2.
This name was in version 1 of The Plant List, record gcc-55818.