This name is a synonym of Sedum minimum subsp. delicatum (Rose) R.T. Clausen.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 8900217) with original publication details: Contr. U.S. Natl. Herb. 13(9): 297 1911.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:231695-2.
This name was in version 1 of The Plant List, record tro-8900217, and has not been changed.