This name is a synonym of Symphyotrichum lateriflorum var. tenuipes (Wiegand) G.L.Nesom.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 95853586-DA04-4195-925A-604A23CA2907) with original publication details: Rhodora 30 174 1928.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:23643-2.
This name was in version 1 of The Plant List, record gcc-51920, and has not been changed.