This name is a synonym of Hymenanthes californica (Hook.) H.F. Copel..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50280278) with original publication details: Bot. Mag. 81: pl. 4863 1855.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:219454-2.
This name was in version 1 of The Plant List, record tro-50280278, and has not been changed.