This name is a synonym of Helianthus pauciflorus subsp. subrhomboideus (Rydb.) O.Spring & E.E.Schill..
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record EDE132FD-6E05-4C35-95B4-054DF5CDB708) with original publication details: 79 1946.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:119155-2.
This name was in version 1 of The Plant List, record gcc-2873, and has not been changed.