This name is a synonym of Helianthus silphioides Nutt..
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record EC32FFDD-DCD1-4683-85C4-E6F958F4C78D) with original publication details: Revis. Gen. Pl. 1: 343 343 1891.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:119057-2.
This name was in version 1 of The Plant List, record gcc-69509, and has not been changed.