This name is a synonym of Washingtonia filifera (Linden ex André) H.Wendl. ex de Bary.
The record derives from WCSP
(data supplied on 2012-03-23)
which reports it as a synonym (record 214251) with original publication details: Webbia 2: 191 1907.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:267790-2.
This name was in version 1 of The Plant List, record kew-214251.