This name is a synonym of Sedum elatinoides Franch..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50054474) with original publication details: Nuovo Giorn. Bot. Ital., n.s., 17(2): 281 1910.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:276067-1.
This name was in version 1 of The Plant List, record tro-50054474, and has not been changed.