This name is a synonym of Sedum spathulifolium subsp. purdyi (Jeps.) R.T. Clausen.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 8901458) with original publication details: Fl. Calif. 2(2): 110 1936.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:275904-1.
This name was in version 1 of The Plant List, record tro-8901458.