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 9F06A921-E3F0-480C-9830-3924607B9185) with original publication details: Rhodora 46 31 1944.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:23011-2.
This name was in version 1 of The Plant List, record gcc-30862, and has not been changed.