This name is a synonym of Chylismia exilis (P.H.Raven) W.L.Wagner & Hoch.
The record derives from WCSP (in review)
(data supplied on 2012-03-23)
which reports it as a synonym with original publication details: Univ. Calif. Publ. Bot. 34: 114 1962.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:172967-2.
This name was in version 1 of The Plant List, record kew-2398847, and has not been changed.