This name is a synonym of Sedum lanceolatum subsp. subalpinum (Blank.) R.T. Clausen.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 8901464) with original publication details: Sci. Stud. Montana Coll. Agric., Bot. 1(2): 61 1905.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:284832-2.
This name was in version 1 of The Plant List, record tro-8901464.