This name is a synonym of Sedum obtusatum subsp. retusum (Rose) R.T. Clausen.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 8902029) with original publication details: Nat. Pflanzenfam. (ed. 2) 18a: 451 1930.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:296227-2.
This name was in version 1 of The Plant List, record tro-8902029.