This name is a synonym of Helianthus praecox subsp. runyonii (Heiser) Heiser.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 3C89A44E-28E3-4D6D-BBF8-8197B24EB6D0) with original publication details: Phytologia 69(1) 15 1990.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:278039-2.
This name was in version 1 of The Plant List, record gcc-56841, and has not been changed.