This name is a synonym of Ceanothus prostratus subsp. pumilus (Greene) C.L.Schmidt.
The record derives from WCSP (in review)
(data supplied on 2012-03-23)
which reports it as a synonym with original publication details: Erythea 1: 149 1893.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:50766-2.
This name was in version 1 of The Plant List, record kew-2706868, and has not been changed.