This name is a synonym of Sedum acre L..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 8902080) with original publication details: Biol. Ser. Bull. State Univ. Montana 15: 30, pl. 4 1910.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:231714-2.
This name was in version 1 of The Plant List, record tro-8902080.