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 8901987) with original publication details: J. Roy. Hort. Soc. 46: 161 1921.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:231902-2.
This name was in version 1 of The Plant List, record tro-8901987, and has not been changed.