This name is a synonym of Helianthus laevigatus Torr. & A.Gray.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 72710363-591C-4FA5-903D-D8BF00ACC017) with original publication details: 376 1929.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:119237-2.
This name was in version 1 of The Plant List, record gcc-127879.