This name is a synonym of Sedum ternatum Michx..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 8901986) with original publication details: Hortus Cantabrig. 126 1811.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:275306-1.
This name was in version 1 of The Plant List, record tro-8901986, and has not been changed.