This name is a synonym of Sedum cockerellii Britton.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 8901991) with original publication details: New N. Amer. Crassul. 44 1903.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:231921-2.
This name was in version 1 of The Plant List, record tro-8901991.