This name is a synonym of Helianthus petiolaris var. canescens A.Gray.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 9721746F-745A-43EF-A822-4E07615F8EC0) with original publication details: 190 1913.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:119074-2.
This name was in version 1 of The Plant List, record gcc-42117, and has not been changed.