This name is a synonym of Helianthus debilis subsp. silvestris Heiser.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record FEC26117-756E-4573-AFD9-06227C845EA0) with original publication details: 223 1977.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:119097-2.
This name was in version 1 of The Plant List, record gcc-3319, and has not been changed.