This name is a synonym of Eucephalus ledophyllus var. covillei (Greene) G.L.Nesom.
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 17BCC371-2B53-4DD9-A231-5B4DC80EF98F) with original publication details: Vasc. Pl. Pacific NorthW. 5 89 1955.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:23659-2.
This name was in version 1 of The Plant List, record gcc-49294, and has not been changed.