This name is a synonym of Sedum radiatum subsp. ciliosum (Howell) R.T. Clausen.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 8901998) with original publication details: J. Cact. Succ. Soc. Amer. 20(10): 144 1948.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:231887-2.
This name was in version 1 of The Plant List, record tro-8901998.