This name is a synonym of Sedum triactina A. Berger.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 8903516) with original publication details: J. Linn. Soc., Bot. 2: 103 1858.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:276897-1.
This name was in version 1 of The Plant List, record tro-8903516.