This name is a synonym of Oemleria cerasiformis (Torr. & A.Gray ex Hook. & Arn.) J.W.Landon.
The record derives from RJP
(data supplied on 2011-10-18)
which reports it as a synonym (record 729) with original publication details: ; 1891 191 1891.
This name record (from RJP) 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 Osmaronia cerasiformis in version 1 of The Plant List.