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 442DFAAC-C01E-4190-8A10-13BF338A6ADE) with original publication details: Mem. Torrey Bot. Club 22(3): 43 1969.
This name was in version 1 of The Plant List, record gcc-10573, and has not been changed.