This name is a synonym of Geum macrophyllum Willd..
The record derives from RJP
(data supplied on 2011-10-18)
which reports it as a synonym (record 5621) with original publication details: Flora of Alaska and Yukon Flora of Alaska and Yukon; 1946 1040 1946.
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 Geum macrophyllum in version 1 of The Plant List.