This name is a synonym of Potentilla nepalensis Hook..
The record derives from RJP
(data supplied on 2011-10-18)
which reports it as a synonym and as a spelling variant (record 60387) with original publication details: Index Kewensis Index Kewensis; 613 1894.
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 Potentilla gulielmiwaldemarii in version 1 of The Plant List.