This name is a synonym of Sedum polystriatum R.T.Clausen.
The record derives from WCSP (in review)
(data supplied on 2012-03-23)
which reports it as a synonym and as an illegitimate name with original publication details: Magyar Bot. Lapok 16: 17 1917 publ. 1918.
This name record (from WCSP (in review)) was not included in version 1 of The Plant List. It is possible the same name was included from a different data source, to check this you can search for Sedum pulchellum in version 1 of The Plant List.