This name is a synonym of Libanothamnus occultus (S.F.Blake) Cuatrec..
The record derives from TICA
(data supplied on 2012-02-11)
which reports it as a synonym (record 27CC352C-B7C5-4CF4-9E0B-67044E2C0F11) with original publication details: Contr. U. S. Natl. Herb. 20 537 1924.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:97736-2.
This name was in version 1 of The Plant List, record gcc-77493.