This name is a synonym of Sedum lanceolatum Torr..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 8901993) with original publication details: New N. Amer. Crassul. 41 1903.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:231875-2.
This name was in version 1 of The Plant List, record tro-8901993.