This name is a synonym of Coreopsis hamiltonii (Elmer) Sharsm..
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 288562C2-0720-4FB7-867F-CBE8F3F07C7B) with original publication details: Bot. Gaz. 41: 323. 1906 323 1906.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:279584-2.
This name was in version 1 of The Plant List, record gcc-122397, and has not been changed.