This name is a synonym of Micranthemum umbrosum (J.F.Gmel.) S.F.Blake.
The record derives from WCSP
(data supplied on 2012-03-26)
which reports it as a synonym (record 220374) with original publication details: Fl. Carol. 63 1788.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:435529-1.
This name was in version 1 of The Plant List, record kew-220374.