This name is a synonym of Sorbus forrestii McAll. & Gillham.
The record derives from RJP
(data supplied on 2011-10-18)
which reports it as a synonym (record 54501) with original publication details: Symbolae sinicae Symbolae sinicae; 1929 470 1933.
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 Sorbus prattii in version 1 of The Plant List.