This name is a synonym of Sedum lanceolatum subsp. nesioticum (G.N. Jones) R.T. Clausen.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 8901434) with original publication details: Madroño 6(3): 86 1941.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:231796-2.
This name was in version 1 of The Plant List, record tro-8901434.