This name is a synonym of Sophora tomentosa subsp. littoralis (Schrad.) Yakovlev.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 13032954) with original publication details: Arb. ed. Nov. 3: 87 .
This name record (from Tropicos) 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 Sophora crassifolia in version 1 of The Plant List.