This name is a synonym of Eucephalus engelmannii (D.C.Eaton) Greene.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record A1235A39-03CC-4AB6-8447-DCCACBDCA8B2) with original publication details: 144 1871.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:23361-2.
This name was in version 1 of The Plant List, record gcc-68169.