This name is a synonym of Micranthemum umbrosum (J.F.Gmel.) S.F.Blake.
The record derives from WCSP (in review)
(data supplied on 2012-03-26)
which reports it as a synonym with original publication details: Fl. Bor.-Amer. 1: 10 1803.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:805810-1.
This name was in version 1 of The Plant List, record kew-2506391.